HP Hewlett Packard Computer Accessories 16501A LOGIC User Manual

User’s Guide  
Publication number 16500-97022  
August 1997  
For Safety information, Warranties, and Regulatory  
information, see the pages behind the Index  
© Copyright Hewlett-Packard Company 1987, 1990, 1993, 1994, 1996, 1997  
All Rights Reserved  
HP 16500C /16501A Logic  
Analysis System  
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HP 16500C  
HP 16501A  
iii  
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iv  
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In This Book  
Triggering  
Intermodule Measurements  
File Management  
Concepts  
1
2
3
4
5
6
This User’s Guide shows you how to use  
the HP 16500C Logic Analysis System in  
your everyday debugging work.  
Chapter 1, “Triggering,” shows you how  
to set up the analyzer to trigger on the  
various kinds of events present in your  
system. Advanced triggering capability  
allows you to look at only the program  
states of interest when you are solving a  
particular problem.  
Solving Problems  
Application Notes  
Glossary  
Chapter 2, “Intermodule Measurements,”  
shows you how to configure multiple  
HP 16500 modules and external  
measurement instruments into a single  
measurement system in which modules  
trigger each other.  
Index  
Chapter 3, “File Management,” shows you  
how to transfer files to and from the  
HP 16500C using flexible disks, LAN  
interfaces, and other interfaces.  
Chapter 4,“Concepts,” gives you a brief  
introduction to the ideas underlying the  
trigger sequencer and the inverse  
assembler, two important components of  
sophisticated logic analysis.  
Chapter 5, “Solving Problems,” shows you  
how to diagnose and correct the more  
common types of problems that might  
occur while you are making a  
measurement.  
Chapter 6, “Application Notes,” lists the  
various application notes that HP has  
published regarding the HP 16500C and  
other similar HP logic analyzers. These  
notes will give you more information  
v
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about specific application problems and how to solve them using an HP logic  
analyzer.  
See Also  
For general information on setup and operation of the HP 16500C, see the  
HP 16500C /16501A Logic Analysis System User’s Reference.  
For information on programming the HP 16500C using a computer controller  
such as a workstation or personal computer, see the HP 16500C/16501A  
Logic Analysis System Programmer’s Guide. The Programmer’s Guide is  
available from your HP Sales Office.  
For information on logic analyzers, oscilloscopes, preprocessors, and other  
logic analysis system options, see the User’s Reference manual for those  
options.  
vi  
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Contents  
1 Triggering  
To store and time the execution of a subroutine 1–3  
To trigger on the nth iteration of a loop 1–5  
To trigger on the nth recursive call of a recursive function 1–6  
To trigger on entry to a function 1–8  
To capture a write of known bad data to a particular variable 1–10  
To trigger on a loop that occasionally runs too long 1–11  
To verify that all stacks and registers are restored correctly before  
exiting a subroutine 1–12  
To trigger after all status bus lines finish transitioning 1–13  
To find the nth assertion of a chip select line 1–14  
To verify that the chip select line of a memory chip is strobed after  
the address is stable 1–15  
To trigger when expected data does not appear on the data bus from  
a remote device when requested 1–16  
To test minimum and maximum pulse limits 1–18  
To detect a handshake violation 1–20  
To detect bus contention 1–21  
Cross-Arming Trigger Examples 1–22  
To examine software execution when a timing violation occurs 1–23  
To look at control and status signals during execution of a routine 1–24  
2 Intermodule Measurements  
Intermodule Measurement Examples 2–4  
To set up a group run of modules within the HP 16500C 2–4  
To start a group run of modules from an external trigger source 2–6  
To start an external instrument on command from a module within  
the HP 16500 and 16501 mainframe 2–8  
To see the status of a module within an intermodule measurement 2–10  
To see time correlation of each module within an  
intermodule measurement 2–12  
To use a timing analyzer to detect a glitch 2–14  
To capture the waveform of a glitch 2–15  
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Contents  
To capture state flow showing how your target system processes  
an interrupt 2–16  
To test a circuit using stimulus-response 2–17  
To use a state analyzer to trigger timing analysis of a count-down on  
a set of data lines 2–18  
To monitor the activity of two coprocessors in a target system 2–19  
Special displays 2–21  
To interleave trace lists 2–22  
To view trace lists and waveforms together on the same display 2–24  
Skew Adjustment 2–26  
To adjust for minimum skew between two modules involved in  
an intermodule measurement 2–27  
3 File Management  
Transferring Files Using the Flexible Disk Drive 3–3  
To save a measurement configuration 3–4  
To load a measurement configuration 3–6  
To save a trace list in ASCII format 3–8  
To save a menu or measurement as a graphic image 3–10  
To load system software 3–12  
Using the LAN Interface 3–13  
To set up the HP 16500C 3–14  
To transfer data files from the HP 16500C system to your computer 3–16  
To transfer graphics files from the HP 16500C system to your computer 3–18  
viii  
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Contents  
4 Concepts  
The Trigger Sequencer 4–3  
The Inverse Assembler 4–10  
Configuration Translation for Analyzer Modules 4–13  
5 If You Have a Problem  
Analyzer Problems 5–3  
Intermittent data errors 5–3  
Unwanted triggers 5–3  
No Setup/Hold field on format screen 5–4  
No activity on activity indicators 5–4  
Capacitive loading 5–4  
No trace list display 5–5  
Preprocessor Problems 5–6  
Target system will not boot up 5–6  
Slow clock 5–7  
Erratic trace measurements 5–7  
Inverse Assembler Problems 5–9  
No inverse assembly or incorrect inverse assembly 5–9  
Inverse assembler will not load or run 5–10  
Intermodule Measurement Problems 5–11  
An event wasn’t captured by one of the modules 5–11  
ix  
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Contents  
Messages 5–12  
“Default Calibration Factors Loaded” (HP 16540, 16541, and 16542) 5–12  
“. . . Inverse Assembler Not Found” 5–12  
“Measurement Initialization Error” 5–13  
“No Configuration File Loaded” 5–14  
“Selected File is Incompatible” 5–14  
“Slow or Missing Clock” 5–14  
“State Clock Violates Overdrive Specification” 5–15  
“Time from Arm Greater Than 41.93 ms” 5–15  
“Waiting for Trigger” 5–16  
6 Application Notes  
Glossary  
Index  
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1
Triggering  
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Triggering  
As you begin to understand a problem in your system, you may realize  
that certain conditions must occur before the problem occurs. You  
can use sequential triggering to ensure that those conditions have  
occurred before the analyzer recognizes its trigger and captures  
information.  
You set up sequential triggering as follows:  
Select the Trigger menu for the module you are using.  
In the Trigger menu, define terms and associated values to be used  
when searching through the sequence.  
In the Trigger menu, select the number of the state sequence level  
you want to modify, and enter the appropriate store qualification,  
sequence-advance specification, and sequence-Else specification.  
If you aren’t familiar with the trigger menus, try working through the  
examples in the Logic Analyzer Training Kit manual, or refer to the  
User’s Reference for your analyzer.  
1–2  
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Triggering  
To store and time the execution of a subroutine  
To store and time the execution of a subroutine  
Most systems software of any kind is composed of a hierarchy of functions  
and procedures. During integration, testing, and performance evaluation, you  
will want to look at specific procedures to verify that they are executing  
correctly and that the implementation is efficient. The analyzer allows you to  
do this by triggering on entry to the address range of the subroutine and  
counting the elapsed time since the trigger state.  
1 Select the state analyzer Trigger menu.  
2 Set Count to Time.  
Setting the Count to Time causes the state analyzer to store a time stamp for  
each data point that is stored in trace memory. The trace list will show these  
time stamps next to each state.  
3 Define a range term, such as Range1, to represent the address range  
of the subroutine of interest.  
You may need to examine the structure of your code to help determine this.  
If your subroutine calls are really procedure calls, then there is likely to be  
some code at the beginning of the routine that adjusts the stack for local  
variable allocation. This will precede the address of the first statement in the  
procedure. If your subroutine has no local storage and is called by a jump or  
branch, then the first statement will also be the entry address.  
4 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “no state” Trigger on “In_range1” 1 time  
While storing “In_range1” Then find “Out_range1” 1 time  
Store “no state”  
1–3  
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Triggering  
To store and time the execution of a subroutine  
Example  
Suppose you want to trigger on entry to a routine called MY_SUB. You can  
define the address of MY_SUB in the Format menu, allowing you to reference  
the symbol name when setting up the trace specification. Assume that  
MY_SUB extends for 0A hex locations. You can set up the trigger sequencer  
as shown in the display.  
Trigger Setup for Storing Execution of a Subroutine  
For processors that do prefetching of instructions or have pipelined  
architectures, you may want to add part or all of the depth of the pipeline to the  
start address for In_Range1 to ensure that the analyzer does not trigger on a  
prefetched but unexecuted state.  
1–4  
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Triggering  
To trigger on the nth iteration of a loop  
To trigger on the nth iteration of a loop  
Traditional debugging requires print statements around the area of interest.  
This is not possible in most embedded systems designs. But, the analyzer  
allows you to view the system’s behavior when a particular event occurs.  
Suppose that your system behaves incorrectly on the last iteration of a loop,  
which, in this instance, happens to be the 10th iteration. You can use the  
analyzer’s triggering capabilities to capture that iteration and subsequent  
processor activity.  
1 Select the state analyzer Trigger menu.  
2 Define the terms LP_START and LP_END to represent the start and  
end addresses of statements in the loop, and LP_EXIT to represent  
the first statement executed after the loop terminates.  
3 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “no state” Find LP_END 1 time  
While storing “anystate” TRIGGER on LP_START 9 times; Else on  
“LP_EXIT” go to level 1  
Store “anystate”  
The above sequence specification has some advantages and a potential  
problem. The advantages are that a pipelined processor won’t trigger until it  
has executed the loop 10 times. Requiring LP_END to be seen at least once  
first ensures that the processor actually entered the loop; then, 9 more  
iterations of LP_START is really the 10th iteration of the loop. Also, no  
trigger occurs if the loop executes less than 10 times: the analyzer sees  
LP_EXIT and restarts the trigger sequence. The potential problem is that  
LP_EXIT may be too near LP_END and thus appear on the bus during a  
prefetch. The analyzer will constantly restart the sequence and will never  
trigger. The solution to this problem depends on the structure of your code.  
You may need to experiment with different trigger sequences to find one that  
captures only the data you wish to view.  
1–5  
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Triggering  
To trigger on the nth recursive call of a recursive function  
To trigger on the nth recursive call of a recursive  
function  
1 Select the state analyzer Trigger menu.  
2 Define the terms CALL_ADD, F_START, and F_END to represent the  
called address of the recursive function, and the start and end  
addresses of the function. Define F_EXIT to represent the address of  
the first program statement executed after the original recursive call  
has terminated.  
Typically, CALL_ADD is the address of the code that sets up the activation  
record on the stack, F_START is the address of the first statement in the  
function, and F_END is the address of the last instruction of the function,  
which does not necessarily correspond to the address of the last statement. If  
the start of the function and the address called by recursive calls are the  
same, or you are not interested in the function initialization code, you can use  
F_START for both CALL_ADD and F_START.  
3 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “no state” Find “F_END” 1 time  
While storing “anystate” Then find “F_START” 1 time  
While storing “anystate” TRIGGER on “CALL_ADD” 20 times Else on  
“F_EXIT” go to level 1  
Store “anystate”  
As with the trigger specification for “To trigger on the nth iteration of a loop,”  
this specification helps avoid potential problems on pipelined processors by  
requiring that the processor already be in the first recursive call before  
advancing the sequencer. Because it is already in the first recursive call, this  
example triggers on the 21st recursive call, which is the 22nd entrance to the  
function. Depending on the exact code used for the calls, you may need to  
experiment with different trigger sequences to find one that captures only  
the data you wish to view.  
1–6  
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Triggering  
To trigger on the nth recursive call of a recursive function  
Triggering on the 22nd Call of a Recursive Function  
1–7  
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Triggering  
To trigger on entry to a function  
To trigger on entry to a function  
This sequence triggers on entry to a function only when it is called by one  
particular function.  
1 Select the state analyzer Trigger menu.  
2 Define the terms F1_START and F1_END to represent the start and  
end addresses of the calling function. Define F2_START to represent  
the start address of the called function.  
3 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “anystate” Find “F1_START” 1 time  
While storing “anystate” TRIGGER on “F2_START” 1 time Else on  
“F1_END” go to level 1  
Store “anystate”  
This sequence specification assumes there is some conditional logic in  
function F1 that chooses whether or not to call function F2. Thus, if F1 ends  
without the analyzer having seen F2, the sequence restarts.  
The specification also stores all execution inside function F1, whether or not  
F2 was called. If you are interested only in the execution of F1, without the  
code that led to its invocation, you can change the storage specification from  
“anystate” to “nostate” for the second sequence term.  
1–8  
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Triggering  
To trigger on entry to a function  
Triggering on Entry to a Function  
1–9  
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Triggering  
To capture a write of known bad data to a particular variable  
To capture a write of known bad data to a particular  
variable  
The trigger specification ANDs the bad data on the data bus, write  
transaction on the status bus, and address of the variable on the address bus.  
1 Select the state analyzer Trigger menu.  
2 Define the terms BAD_DATA, WRITE, and VAR_ADDR to represent  
the bad data value, write status, and the address of the variable.  
3 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “anystate” TRIGGER on “BAD_DATA WRITE •  
VAR_ADDR” one time (you use the Combination trigger term to do this)  
Store “anystate”  
Capturing a Bad Write to a Variable  
1–10  
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Triggering  
To trigger on a loop that occasionally runs too long  
To trigger on a loop that occasionally runs too long  
This example assumes the loop normally executes in 14 µs.  
1 Select the state analyzer Trigger menu.  
2 Define terms LP_START, LP_END, and Timer1 to represent the start  
and end addresses of the loop, and the normal duration of the loop.  
You can make the sequence specification closer to the problem domain by  
renaming Timer1 to LOOP_DUR.  
3 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “anystate” Find “LP_START” 1 time  
While storing “anystate” TRIGGER on “LOOP_DUR 14.00 µs” 1 time Else  
on “LP_END” go to level 1  
You will need to start the LOOP_DUR timer (Timer1) upon entering  
this state. You do this using the Timer Control field in the menu for  
sequence level 2.  
Store “anystate”  
Triggering on a Loop Overrun  
1–11  
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Triggering  
To verify that all stacks and registers are restored correctly before exiting a  
subroutine  
To verify that all stacks and registers are restored  
correctly before exiting a subroutine  
The exit code for a function will often contain instructions for deallocating  
stack storage for local variables and restoring registers that were saved  
during the function call. Some language implementations vary on these  
points, with the calling function doing some of this work, so you may need to  
adapt the procedure to suit your system.  
1 Select the state analyzer Trigger menu.  
2 Define terms SR_START and SR_END to represent the start and end  
addresses of the subroutine.  
3 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “anystate” Find “SR_START” 1 time  
While storing “anystate” Then find “SR_END” 1 time  
While storing “anystate” TRIGGER on “SR_START” 1 time Else on  
“SR_START” go to level 2  
Store “anystate”  
Verifying Correct Return from a Function Call  
1–12  
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Triggering  
To trigger after all status bus lines finish transitioning  
To trigger after all status bus lines finish transitioning  
In some applications, you will want to trigger a measurement when a  
particular pattern has become stable. For example, you might want to trigger  
the analyzer when a microprocessor’s status bus has become stable during  
the bus cycle.  
1 Select the timing analyzer Trigger menu and define a term called  
PATTERN to represent the value to be found on the label  
representing the status bus lines.  
2 Under Timing Sequence Levels, enter the following sequence  
specification:  
TRIGGER on “PATTERN” > 40 ns  
Triggering after lines are done transitioning  
1–13  
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Triggering  
To find the nth assertion of a chip select line  
To find the nth assertion of a chip select line  
1 Select the timing analyzer Trigger menu.  
2 Define the glitch/edge1 term to represent the asserting transition on  
the chip select line.  
You can rename the Edge1 term to make it correspond more closely to the  
problem domain, for example, to CHIP_SEL.  
3 Under Timing Sequence Levels, enter the following sequence  
specification:  
TRIGGER on “CHIP_SEL” 10 times  
Triggering on the 10th Assertion of a Chip Select Line  
1–14  
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Triggering  
To verify that the chip select line of a memory chip is strobed after the address is stable  
To verify that the chip select line of a memory chip is  
strobed after the address is stable  
1 Select the timing analyzer Trigger menu.  
2 Define a term called ADDRESS to represent the address in question  
and the Edge1 term to represent the asserting transition on the chip  
select line.  
You can rename the Edge1 term to suit the problem, for example, to  
MEM_SEL.  
3 Under Timing Sequence Levels, enter the following sequence  
specification:  
Find “ADDRESS” > 80 ns  
TRIGGER on “MEM_SEL” 1 time Else on “ADDRESS” go to level 1  
Verifying Setup Time for Memory Address  
1–15  
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Triggering  
To trigger when expected data does not appear on the data bus from a remote  
device when requested  
To trigger when expected data does not appear on the  
data bus from a remote device when requested  
1 Select the timing analyzer Trigger menu.  
2 Define a term called DATA to represent the expected data, the Edge1  
term to represent the chip select line of the remote device, and the  
Timer1 term to identify the time limit for receiving expected data.  
You can rename the Edge1 and Timer1 terms to match the problem domain,  
for example, to REM_SEL and ACK_TIME.  
3 Under Timing Sequence Levels, enter the following sequence  
specification:  
Find “REM_SEL” 1 time  
TRIGGER on “ACK_TIME > 16.00 µs” 1 time Else on “DATA” go to level 1  
You will need to use the Timer Control field in the sequence setup for  
sequence level 2 to start the ACK_TIME timer upon entering that sequence  
level.  
This sequence specification causes the analyzer to trigger when the data does  
not occur in 16 µs or less. If it does occur within 16 µs, the sequence restarts.  
Specifications of this type are useful in finding intermittent problems. You  
can set up and run the trace, then cycle the system through temperature and  
voltage variations, using automatic equipment if necessary. The failure will be  
captured and saved for later review.  
1–16  
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Triggering  
To trigger when expected data does not appear on the data bus from a remote device when requested  
Triggering When I/O Data Not Returned  
1–17  
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Triggering  
To test minimum and maximum pulse limits  
To test minimum and maximum pulse limits  
1 Select the timing analyzer Trigger menu.  
2 Define the Edge1 term to represent the positive-going transition, and  
define the Edge2 term to represent the negative-going transition on  
the line with the pulse to be tested.  
You can rename these terms to POS_EDGE and NEG_EDGE.  
3 Define the Timer1 term to represent the minimum pulse width, and  
the Timer2 term to represent the maximum pulse width.  
You can rename these terms to MIN_WID and MAX_WID. In this example,  
Timer1 was set to 496 ns and Timer2 was set to 1 µs. Both timers start when  
sequence level 2 is active.  
4 Under Timing Sequence Levels, enter the following sequence  
specification:  
Find “POS_EDGE” 1 time  
Then find “NEG_EDGE” 1 time  
TRIGGER on “MIN_WID 496 ns + MAX_WID 1.00 µs” 1 time Else on  
“anystate” go to level 1  
Because both timers start when entering sequence level 2, they start as soon  
as the positive edge of the pulse occurs. Once the negative edge occurs, the  
sequencer transitions to level 3. If at that point, the MIN_WID timer is less  
than 496 ns or the MAX_WID timer is greater than 1 µs, the pulse width has  
been violated and the analyzer should trigger. Otherwise, the sequence is  
restarted.  
Measurement of Minimum and Maximum Pulse Width Limits  
1–18  
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Triggering  
To test minimum and maximum pulse limits  
Triggering when a Pulse Exceeds Minimum or Maximum Limits  
1–19  
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Triggering  
To detect a handshake violation  
To detect a handshake violation  
1 Select the timing analyzer Trigger menu.  
2 Define the Edge1 term to represent either transition on the first  
handshake line, and the Edge2 term to represent either transition on  
the second handshake line.  
You can rename these terms to match your problem, for example, to REQ  
and ACK.  
3 Under Timing Sequence Levels, enter the following sequence  
specification:  
Find “REQ” 1 time  
TRIGGER on “REQ” 1 time Else on “ACK” go to level 1  
Triggering on a Handshake Violation  
1–20  
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Triggering  
To detect bus contention  
To detect bus contention  
In this sequencer setup, the trigger occurs only if both devices assert their  
bus transfer acknowledge lines at the same time.  
1 Select the timing analyzer Trigger menu.  
2 Define the Edge1 term to represent assertion of the bus transfer  
acknowledge line of one device, and Edge2 term to represent  
assertion of the bus transfer acknowledge line of the other device.  
You can rename these to BTACK1 and BTACK2.  
3 Under Timing Sequence Levels, enter the following sequence  
specification:  
TRIGGER on “BTACK1 BTACK2” 1 time  
Triggering on Bus Contention  
1–21  
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Cross-Arming Trigger Examples  
The following examples use cross arming to coordinate measurements  
between two instruments. The cross-arming is set up in the Arming  
Control menu (obtained by selecting Arming Control in the Trigger  
menu). When coordinating measurements between two or more  
analyzers, select Count Time so you can correlate the measurements  
made by the two analyzers.  
See Also  
Chapter 2, “Intermodule Measurements.”  
1–22  
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Triggering  
To examine software execution when a timing violation occurs  
To examine software execution when a timing  
violation occurs  
The timing analyzer triggers when the timing violation occurs, and when it  
triggers, it also sets its “arm” level to true. When the state analyzer receives  
the arm signal, it triggers immediately on the present state.  
1 Select the timing analyzer Trigger menu.  
2 Define the Edge1 term to represent the control line where the timing  
violation occurs.  
3 Under Timing Sequence Levels, enter the following sequence  
specification:  
TRIGGER on “glitch/edge1” 1 time  
4 Select the state analyzer Trigger menu and accept the default  
(anystate) definition for term a.  
5 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “anystate” TRIGGER on “arm a” 1 time  
Store “anystate”  
1–23  
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Triggering  
To look at control and status signals during execution of a routine  
To look at control and status signals during execution  
of a routine  
The state analyzer will trigger on the start of the routine whose control and  
status signals are to be examined with finer resolution than once per bus  
cycle. When it triggers, it will switch its “arm” level true. The timing analyzer  
will trigger when it receives the true arm level and detects the transition  
represented by glitch/edge1.  
1 Select the state analyzer Trigger menu and define term R_START to  
represent the starting address of the routine.  
2 Under State Sequence Levels, enter the following sequence  
specification:  
While storing “anystate” TRIGGER on “R_START” 1 time  
Store “anystate”  
3 Select the timing analyzer Trigger menu.  
4 Define the Edge1 term to represent a transition on one of the control  
signals.  
5 Under Timing Sequence Levels, enter the following sequence  
specification:  
TRIGGER on “arm Edge1” 1 time  
1–24  
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2
Intermodule Measurements  
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Intermodule Measurements  
An intermodule measurement is a measurement that is coordinated  
between two or more modules to capture different types of  
information related to a problem you are trying to solve. This chapter  
shows you how to make several kinds of intermodule measurements.  
Intermodule measurements can involve state analyzers, timing  
analyzers, oscilloscopes, and pattern generators. The measurement  
may be as simple as coordinating the startup of several modules  
during a measurement; it may be quite complex and include multiple  
arming sequences between modules and external equipment.  
For example, you may have a timing analyzer detect the occurrence of  
a glitch, and at the same time, have an oscilloscope capture the glitch  
waveform and a state analyzer capture the program flow before and  
after the occurrence of the glitch. With several types of information  
obtained from various analysis modules, you can discover problems  
that would otherwise be difficult to identify.  
The figure on the opposite page shows how intermodule bus arming  
signals are connected between modules inside the HP 16500C and  
HP 16501A. Note that any arm input can be driven by any slot, and  
that the port input line can drive any slot.  
If you are unfamiliar with the basic operation of the Intermodule  
Menu, try working the examples in the Logic Analyzer Training Kit.  
2–2  
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Intermodule Measurements  
Intermodule Bus Block Functional Diagram  
2–3  
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Intermodule Measurement Examples  
To set up an intermodule measurement, you must use the  
Intermodule menu. All modules that will participate in the  
intermodule measurement must be represented in this menu and their  
relationships must be shown under the Group Run field.  
To set up a group run of modules within the  
HP 16500C  
Modules are armed in the configuration tree by either an individual module or  
the Group Run field. When armed, a module begins searching for the input  
that will satisfy its trigger specification. To obtain a specification that triggers  
on the arm signal, specify to trigger on “anystate.”  
1 Select the Intermodule menu.  
2 Select the second field down from the top on the left, then select  
Group Run.  
3 Select the name of each module you want to include in the  
measurement.  
The modules are listed under “Modules” on the right side of the menu.  
a Select Group Run if you want to arm this module immediately when  
the Group Run begins.  
b Select the name of another module if you want the other module to  
arm the present one when the other module finds its trigger.  
c Select Independent if this module should not be included in the  
intermodule measurement.  
4 Select the Group Run field in the upper right hand corner.  
The group run begins. The modules attached directly to the Group Run field  
immediately begin searching for their respective trigger conditions. When a  
module finds its trigger, it arms any modules attached to it in the Group Run  
tree.  
2–4  
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Intermodule Measurements  
To set up a group run of modules within the HP 16500C  
The analyzer in slot  
B is armed when  
the oscilloscope in  
slot D finds its  
trigger condition.  
Oscilloscope Arms State Analyzer in Group Run  
2–5  
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Intermodule Measurements  
To start a group run of modules from an external trigger source  
To start a group run of modules from an external  
trigger source  
1 Connect the arm signal from the external instrument or system to the  
PORT IN BNC connector on the rear panel of the HP 16500 frame.  
2 Select the Intermodule menu.  
3 Set up the group run specification.  
4 Select the PORT IN/OUT field.  
a Select the field under PORT IN Level, then select the level that  
matches the external signal that will be applied to the PORT IN BNC  
on the HP 16500C rear panel.  
The choices are TTL, ECL, and User. The latter allows you to specify a  
voltage from 4.00 V to +5.00 V using an onscreen keypad.  
b Select the field under PORT IN Edge to change from Rising to Falling  
edge and vice-versa for the rear-panel input signal.  
c Select Done to leave the PORT IN/OUT Setup menu.  
5 Select the Group Run field in the upper right hand corner.  
The modules attached directly to the Group Run Armed from PORT IN field  
wait for a signal from the PORT IN field.  
6 Start the external instrument or system.  
When the external instrument sends the proper signal to the PORT IN BNC,  
the internal modules attached directly to the Group Run Armed from PORT  
IN field are armed and begin searching for their respective trigger conditions.  
Modules are armed by modules above them, either an individual module or the  
field named Group Run Armed from PORT IN. That is, in the intermodule display,  
an arrow pointing to a module to be armed originates in the module providing  
the arm signal. See the figure “Oscilloscope Arms State Analyzer in Group Run”  
on page 2-5. When armed, a module begins searching for the input that will  
satisfy its trigger specification. To obtain a specification of “trigger on the arm  
signal,” specify a trigger that equates to “trigger on anything.”  
See Also  
“To set up a group run of modules within the HP 16500C.”  
2–6  
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Intermodule Measurements  
To start a group run of modules from an external trigger source  
Both the analyzer in  
slot B and the  
oscilloscope in slot D  
are armed when the  
PORT IN signal  
arrives.  
State Analyzer and Oscilloscope armed from PORT IN  
2–7  
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Intermodule Measurements  
To start an external instrument on command from a module within the HP 16500  
and 16501 mainframe  
To start an external instrument on command from a  
module within the HP 16500 and 16501 mainframe  
You can set up a module in a group run so that it sends a pulse through the  
PORT OUT rear panel BNC. The pulse can be used to start or stop a  
measurement in an external instrument or system.  
1 Set up the group run specification.  
See “To start a group run of modules within the HP 16500C” or “To start a  
group run of modules from an external trigger source.”  
2 Select PORT IN/OUT.  
The PORT IN/OUT Setup menu appears.  
3 Select the PORT OUT Source field.  
Select Off if no module should drive PORT OUT.  
or  
Select the name of the module you want to have drive PORT OUT.  
If you are using Group Run with OR TRIGGER, Port Out is automatically  
assigned to the OR TRIGGER group.  
4 Set the Type, Polarity, and Output fields to generate the type of signal  
the external instrument expects.  
To generate the same signal as a 16500B would, set Type to Feedthrough,  
Polarity to Active High, and Output to Normal. Normal sends out a standard  
TTL signal; Open Collector sinks 128 milliamps in its low state.  
5 Select Done in the PORT IN/OUT Setup menu.  
See Also  
“To set up a group run of modules within the HP 16500C” or “To start a  
group run of modules from an external trigger source” in this chapter.  
“Configuring Port In/Out” in chapter 2, “Correlating Measurements,” of the  
16500C User’s Reference.  
2–8  
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Intermodule Measurements  
To start an external instrument on command from a module within the HP 16500 and 16501 mainframe  
The analyzer in  
slot B drives port  
out after finding  
its trigger.  
Driving the Port Out BNC in an Intermodule Measurement  
2–9  
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Intermodule Measurements  
To see the status of a module within an intermodule measurement  
To see the status of a module within an intermodule  
measurement  
1 Select the Intermodule menu.  
2 Find the name of the module under the “Modules” list, and read the  
status under the module name.  
The status can be either Running or Stopped. You can interpret these  
indications as follows:  
If a module was running and is now stopped, assume it received its arming  
signal, triggered, and finished its measurement properly.  
If a module located below a stopped module on the intermodule  
configuration tree has received an arming signal and is still running, either  
it is still waiting to satisfy its trigger specification or it has not captured  
enough information to fill its memory.  
If a module below a running module on the intermodule configuration tree  
has not received its arming signal, it will not begin running until the upper  
module finds its trigger condition.  
2–10  
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Intermodule Measurements  
To see the status of a module within an intermodule measurement  
Both modules are  
running because  
neither has found  
its respective  
trigger condition.  
Module Status  
2–11  
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Intermodule Measurements  
To see time correlation of each module within an intermodule measurement  
To see time correlation of each module within an  
intermodule measurement  
Time correlation in the intermodule menu can help you see when the trigger  
occurred for each module and the relative time range of data captured by  
that module.  
1 Select Time in the Count field of the trigger menu of each logic state  
analyzer whose measurement will be time-correlated with the other  
modules.  
Timing analyzers and digitizing oscilloscopes implicitly count time because  
their sampling is driven by an internal clock, rather than an external state  
clock. See the User’s Reference for your logic state analyzer for details on  
how to count time with the analyzer.  
2 Select the Intermodule menu.  
3 Select the Group Run field in the upper right hand corner.  
Once the measurement has started, view the time correlation bars at the  
bottom of the Intermodule Menu. The “T” in each bar indicates the relative  
time at which that module found its trigger condition. The yellow portion of  
each bar indicates the start and stop points of the acquisition window of the  
associated module relative to the other modules in the measurement.  
2–12  
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Intermodule Measurements  
To see time correlation of each module within an intermodule measurement  
This portion of the bar  
indicates the relative  
time range of data  
acquired by this  
module.  
T indicates the time  
at which the trigger  
was found.  
Module Time Correlation  
2–13  
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Intermodule Measurements  
To use a timing analyzer to detect a glitch  
To use a timing analyzer to detect a glitch  
The following setup uses a state analyzer to capture state flow occurring at  
the time of the glitch. This can be useful in troubleshooting. For example, you  
might find that the glitch is ground bounce caused by a number of  
simultaneous signal transitions.  
1 Select the Intermodule menu.  
2 Select the timing analyzer from the Modules list and set it to Group  
Run. Select the state analyzer and set it to respond to the arm signal  
from the timing analyzer.  
You must have fully independent state and timing analyzers to make this type  
of measurement. For example, though the HP 16550A can be configured to  
use some of its channels for a state analyzer and some for a timing analyzer, it  
cannot present those analyzers independently for intermodule measurements.  
3 Select the timing analyzer Trigger menu.  
4 Select an Edge term. Then assign glitch detection “*” to the channels  
of interest represented by the Edge term.  
5 Select the state analyzer Trigger menu.  
6 Set the analyzer to trigger on any state and store any state.  
7 Select Group Run in the upper right corner of the display.  
If you don’t see the activity of interest in the state trace, try changing the  
trigger position using the Acquisition Control field in the Trigger menu of the  
state analyzer. By changing the Acquisition mode to manual, you can position  
the trigger at any state relative to analyzer memory.  
The timing analyzer can detect glitch activity on a waveform. A glitch is defined  
as two or more transitions across the logic threshold between adjacent timing  
analyzer samples.  
2–14  
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Intermodule Measurements  
To capture the waveform of a glitch  
To capture the waveform of a glitch  
The following setup uses the triggering capability of the timing analyzer and  
the acquisition capability of the oscilloscope.  
1 Select the Intermodule Menu.  
2 Select the timing analyzer from the Modules list and set it to Group  
Run. Select the oscilloscope module and set it to respond to the arm  
signal from the timing analyzer.  
3 Select the timing analyzer module.  
4 Select the Trigger menu, and within the menu, select an Edge term.  
5 Assign glitch detection "*" to the channel of interest represented by  
the Edge term.  
This will usually be the same channel monitored by the oscilloscope.  
6 Select the oscilloscope Trigger menu, and set Mode to Immediate.  
7 Select the Group Run field in the upper right corner.  
If you have trouble capturing the glitch waveform on the oscilloscope, try  
adjusting the skew in the Intermodule menu, so the oscilloscope triggers  
earlier.  
A timing analyzer can trigger on a glitch and capture it, but a timing analyzer  
doesnt have the voltage or timing resolution to display the glitch in detail. An  
oscilloscope can display a glitch waveform with fine resolution, but cannot  
trigger on glitches, combinations of glitches, or sophisticated patterns involving  
many channels.  
2–15  
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Intermodule Measurements  
To capture state flow showing how your target system processes an interrupt  
To capture state flow showing how your target system  
processes an interrupt  
Use an oscilloscope with a sample rate faster than the microprocessor clock  
rate to trigger on the asynchronous interrupt request.  
1 Select the Intermodule menu.  
2 Select the oscilloscope from the Modules list and set it to Group Run.  
Select the state analyzer module and set it to respond to the arm  
signal from the oscilloscope module.  
3 Select the oscilloscope module.  
4 Select the Trigger menu, and set the mode to Edge trigger.  
5 Select the state analyzer module.  
6 Select the Trigger menu of the state analyzer, and set the analyzer to  
trigger on any state and store any state.  
7 Select Group Run from the upper right corner of the display.  
When the interrupt occurs, the oscilloscope will trigger, subsequently  
triggering the state analyzer.  
If the analyzer doesn’t capture the expected interrupt activity, ensure that  
the interrupt isn’t masked due to the actions of other program code.  
This setup can help you answer questions like the following:  
Does the processor branch to the proper interrupt handling routine?  
Are registers and status information saved properly?  
How long does it take to service the interrupt?  
Is the interrupt acknowledged properly?  
After the interrupt is serviced, does the processor restore registers and  
status information and continue with the interrupted routine as expected?  
You can use the state analyzer to check the address of the interrupt routine as  
well as to see if interrupt processing is done as expected. Using a preprocessor  
and inverse assembler with the state analyzer will make it easier to read the  
program flow.  
2–16  
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Intermodule Measurements  
To test a circuit using stimulus-response  
To test a circuit using stimulus-response  
1 Select the Intermodule menu.  
2 Select the pattern generator from the Modules list and set it to Group  
Run. Select the oscilloscope module and set it to respond to the arm  
signal from the pattern generator. Select the state analyzer and set it  
to respond to the arm signal from the pattern generator.  
3 Load the pattern generator with the proper patterns to simulate the  
signals from the driving hardware.  
4 Insert the “Signal IMB” instruction at the desired point in the pattern  
generator program.  
The arm signal is programmable. It can occur anywhere in the pattern  
generator cycle.  
5 Select the oscilloscope Trigger Menu. Set the oscilloscope to trigger  
on signals of interest in the circuit under test.  
6 Select the state analyzer Trigger Menu. Set the analyzer to trigger on  
addresses, data, or status conditions of interest, and to store any  
state or states of interest.  
7 Select Group Run from the upper right corner of the display.  
The pattern generator will begin its cycle, and will arm the oscilloscope and  
state analyzer.  
In the early stages of system design and integration, you may want to test a  
circuit when the driving hardware that will stimulate it has not yet been  
designed or fabricated. You can also use the pattern generators with the logic  
analyzer to test PC boards when no board-test system is available.  
The HP 16522A pattern generator for the HP 16500C avoids the inconvenience of  
having to stack several signal generators on top of each other, with all of the  
cable connections required for those signal generators. Additionally, you have a  
single interface to access all the test modules in your measurement.  
See Also  
The HP 16522A User’s Reference for the procedures for operating the  
pattern generator.  
2–17  
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Intermodule Measurements  
To use a state analyzer to trigger timing analysis of a count-down on a set of data  
lines  
To use a state analyzer to trigger timing analysis of a  
count-down on a set of data lines  
1 Select the Intermodule menu.  
2 Select the state analyzer from the Modules list and set it to Group  
Run. Select the timing analyzer and set it to respond to the arm signal  
from the state analyzer.  
3 Select the state analyzer Trigger menu.  
4 Set the state analyzer to trigger on the label and term that identify the  
start of the count-down routine.  
If you are not familiar with the procedures for setting up a trigger condition,  
see chapter 1.  
5 In the timing analyzer Trigger Menu, set the timing analyzer to trigger  
on any state and store any state.  
6 Select Group Run from the upper right corner of the display.  
Your target system may include various state machines that are started by  
system events: interrupt processing, I/O activity, and the like. The state analyzer  
is ideal for recognizing the system events; the timing analyzer is ideal for  
examining the step-by-step operation of the state machines.  
2–18  
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Intermodule Measurements  
To monitor the activity of two coprocessors in a target system  
To monitor the activity of two coprocessors in a target  
system  
Debugging coprocessor systems can be a complex task. Replicated systems  
and contention for shared resources increase the potential problems. Using  
two state analyzers with preprocessors can make it much easier to discover  
the source of such problems. For example, you may wish to set up one  
analyzer to trigger only when a certain problem occurs, and set up the other  
analyzer to be armed by the first analyzer so that it takes its trace only when  
the first analyzer recognizes its trigger. This will let you observe the behavior  
of both coprocessors during the occurrence of a problem.  
1 Select the Intermodule menu.  
2 Select the first state analyzer from the Modules list and set it to  
Group Run. Select the second state analyzer and set it to respond to  
the arm signal from the first analyzer.  
3 Select the Trigger menu of the first analyzer.  
4 Set the first analyzer to trigger on the problem condition.  
Some problems may involve complex sequences of conditions. See chapter 1,  
“Triggering,” for more information on defining a trigger sequence.  
5 Select the Trigger menu of the second analyzer.  
6 Set the second analyzer to trigger on any state and store any state.  
2–19  
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Intermodule Measurements  
To monitor the activity of two coprocessors in a target system  
7 Select Group Run from the upper right corner of the display.  
After the measurement is complete, you can interleave the trace lists of both  
state analyzers to see the activity executed by both coprocessors during  
related clock cycles.  
You can use a similar procedure if you have only one processor, but wish to  
monitor its activity with that of other system nodes, such as chip-select lines,  
I/O activity, or behavior of a watchdog timer. In some instances it may be  
easier to look at related activity with a timing analyzer.  
See Also  
“Special Displays” in this chapter.  
“To use a state analyzer to trigger timing analysis of a count-down on a set of  
data lines” in this chapter.  
2–20  
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Special displays  
Interleaved Trace Lists  
Interleaved trace lists allow you to view data captured by two or more  
analyzers in a single trace list. When you interleave the traces, you see  
each state that was captured by each analyzer. These states are  
shown on consecutive lines.  
You can interleave state listings from HP 16510B, 16540A, 16540D,  
and 16550A state analyzers, when two or more are used together in a  
group run. Interleaved state listings are useful when you are using  
multiple analyzers to look at interaction between two or more  
processors. They are also useful when you need more analysis width  
than is available in one analyzer.  
Mixed Display Mode  
The Mixed Display mode allows you to show state listings and  
waveforms together on screen, if all were obtained by modules within  
the HP 16500C and 16501A frame. State listings are shown at the top  
of the screen and waveform displays are shown at the bottom. You can  
interleave state listings from two analyzers at the top of the screen, if  
desired. You can display waveforms from two oscilloscopes or timing  
analyzers at the bottom of the screen.  
2–21  
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Intermodule Measurements  
To interleave trace lists  
To interleave trace lists  
1 Set up the analyzers whose data you wish to interleave as part of a  
group run.  
You won’t need to do this if the two measurement modules for which you  
want mixed display are really part of the same module. For example, you  
might have an HP 16550A state/timing analyzer configured as two separate  
analyzers, one a state analyzer, the other a timing analyzer. You can use  
mixed display to view the timing analyzer waveform with the trace lists from  
the state analyzer.  
2 Select the first state analyzer whose trace list will be shown in the  
interleaved display.  
3 Select Trigger from the menu field and set Count to Time.  
The system uses the time stamps stored with each state to determine the  
ordering of states shown in an interleaved trace list.  
4 Repeat steps 2 and 3 for the second state analyzer.  
5 Select Listing Display from the Menu field.  
6 Select one of the label fields in the trace list display, then select  
Interleave.  
7 Select the name of the analyzer whose trace list will be interleaved  
with the first analyzer. Then choose the label that you want to  
interleave from the selected analyzer.  
Interleaved data is displayed in yellow. Trace list line numbers of interleaved  
data are indented. The labels identifying the interleaved data are shown  
above the labels for the current analyzer, and are displayed in yellow.  
If you have problems with the procedure, and you are using two independent  
analyzers, first ensure that the analyzers are set up as part of a group run.  
Ensure that each analyzer is set to Count Time and that each analyzer has an  
independent clock from the target system.  
You can interleave trace lists from state analyzers that were configured as part  
of a group run or from state analyzers that are configured as separate analyzers  
within the same measurement module. In the first case, you might have two  
HP 16550A analyzers configured in a group run; in the second, you might have a  
single HP 16550A configured as two state analyzers. The interleaved trace lists  
are shown as a time-correlated, state-to-state display.  
2–22  
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Intermodule Measurements  
To interleave trace lists  
Labels for the  
interleaved states are  
shown above those for  
the primary analyzer.  
Interleaved states  
are shown in yellow  
with line numbers  
indented from those  
of the primary  
analyzer.  
Interleaved Trace Lists on the HP 16550A  
See Also  
“To set up a group run of modules within the HP 16500C” in this chapter.  
2–23  
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Intermodule Measurements  
To view trace lists and waveforms together on the same display  
To view trace lists and waveforms together on the  
same display  
1 Set up the modules whose data you wish to view as part of a group  
run.  
You won’t need to do this if the two measurement modules for which you  
want mixed display are really part of the same module. For example, you  
might have an HP 16550A state/timing analyzer configured as two separate  
analyzers, one a state analyzer, the other a timing analyzer. You can use  
mixed display to view the timing analyzer waveform with the trace lists from  
the state analyzer.  
2 Select the module for which you wish to show waveforms.  
This might be an oscilloscope module or a timing analyzer.  
3 Select the label field to the left of the waveform display area twice,  
then choose the waveforms to be shown.  
When you double-select the label field to the left of the waveform display  
area, a new menu appears that allows you to insert and delete signals and  
choose the relative display size and position for the signals.  
4 Select the state analyzer.  
5 Set the Trigger menu of the state analyzer and set the Count field to  
Time.  
Timing analyzers and digitizing oscilloscopes implicitly count time because  
their sampling is driven by an internal clock, rather than an external state  
clock. See the manual for your logic state analyzer for details on how to count  
time with the analyzer.  
6 To insert state listings, select any label field from the state listing.  
From the popup that appears, select the desired label to insert.  
7 Select Mixed Display from the menu field.  
8 Select Group Run from the upper right corner of the display.  
You can position X and O Time markers on the waveform display, if desired.  
Once set, the time markers will be displayed in both the listing and the  
waveform display areas. Note that even if you set X and O Time markers in  
another display, you must also set the Time markers in the Mixed Display if  
Time markers are desired.  
2–24  
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Intermodule Measurements  
To view trace lists and waveforms together on the same display  
You can use the Mixed Display feature in the state analyzer menus to show both  
waveforms and trace lists in the same display, making it easier to correlate the  
events of interest.  
If you are using mixed display as part of a group run, you may need to adjust  
intermodule skew to ensure proper time correlation and display results.  
X and O markers from  
the waveform display  
are shown in their  
relative position on the  
state display.  
Mixed Display using the HP 16550A and HP 16532A  
See Also  
“To set up a group run of modules within the HP 16500C” in this chapter.  
“Skew Adjustment” in this chapter.  
2–25  
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Skew Adjustment  
You can modify the skew or timing deviation between modules within  
the intermodule measurement. This allows you to compensate for any  
known delay of the system under test, or to compare two signals by  
first removing any displayed skew between the signal channels.  
Skew adjustments can correct module delays to within 2 ns of other  
modules. Note that the module or channel that is used as the trigger is  
normally the reference channel, and adjustments are normally made  
to deskew the nonreference channels.  
2–26  
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Intermodule Measurements  
To adjust for minimum skew between two modules involved in an intermodule measurement  
To adjust for minimum skew between two modules  
involved in an intermodule measurement  
1 Connect an input signal from each module to the same signal.  
An ideal signal for testing skew is a single-shot signal with fast risetime. Such  
a signal simplifies triggering and makes it easier to correlate the input event  
between the modules. Ensure that you use proper probe grounding for  
maximum signal fidelity.  
2 Select the Intermodule menu.  
3 Set up both modules so they will begin searching for the trigger  
immediately when a group run begins.  
This setup focuses mostly on trying to eliminate probe skew and internal  
triggering delays. You can use other intermodule setups as well. For example,  
you may be interested in nullifying the effects of the internal arming delay in  
a setup where one module arms another.  
4 Set up the trigger conditions for each module.  
This will depend upon your input signal. For example, if you are adjusting  
intermodule skew using a single-shot pulse with a rising edge, set a timing  
analyzer to trigger on a rising edge using the Edge1 term, and the  
oscilloscope to trigger on a positive slope.  
5 Select the Display or Waveform menu in one of the modules.  
6 Set up the display so that both input waveforms are displayed  
simultaneously.  
You do this by selecting the label field to the left of the display twice. The  
second selection brings up a new menu that allows you to insert or delete  
waveforms. You can delete all but the waveform of interest from the first  
module, then add the waveform of interest from the second module. Select  
Done when finished.  
7 Select Group Run.  
You may now need to trigger the signal of interest, if, for example, it is  
activated by a push button. You may need multiple events to capture good  
waveforms for both measurement modules. Remember that the oscilloscope  
captures far more accurate waveform data than the timing analyzer. Thus, if  
the waveforms do not match exactly, it may only be because the waveform  
edge did not meet the timing analyzer’s setup and hold time specifications for  
a particular sampling period.  
2–27  
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Intermodule Measurements  
To adjust for minimum skew between two modules involved in an intermodule  
measurement  
8 Record the differences shown by the two modules.  
You can use the X and O markers to measure the differences in delays.  
9 Select the Intermodule Menu.  
10 Select Skew, then enter a skew correction value for one of the  
modules using the knob or the keyboard.  
11 Return to the module waveform display and recheck the skew  
adjustment.  
You will need to repeat steps 7 through 11 as needed until the trigger events  
on the two waveforms match as closely as possible.  
Before making an intermodule measurement, you should remove skew between  
the modules to ensure that a simultaneous arm signal to both modules results in  
captures of the same events around the trigger.  
Skew Removal Between Timing Analyzer and Oscilloscope  
2–28  
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3
File Management  
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File Management  
A host computer such as a PC or UNIX workstation can enhance the  
HP 16500C in many ways. You can use the host to store configuration  
files or measurement results for later review. Screen images from the  
HP 16500C can be saved in bitmap files for inclusion in reports  
developed using word processors or desktop publishing tools. Or, you  
can develop programs on the PC that manipulate measurement results  
to satisfy your problem-solving needs.  
This chapter shows you some examples of how to transfer files  
between a host computer and the HP 16500C, using the flexible disk  
drive and the LAN Interface. If you aren’t familiar with basic flexible  
disk drive operations or if you need help setting up or understanding  
the use of the LAN Interface, see the HP 16500C/16501A User’s  
Reference.  
You can also use a host computer to send the HP 16500C complex  
command sequences—allowing you to automate your measurement  
tasks. If you want to program the HP 16500C using a host computer,  
see the HP 16500C/16501A Logic Analysis System Programmer’s  
Guide, available from your HP Sales Office.  
3–2  
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Transferring Files Using the Flexible Disk Drive  
Because the flexible disk drive on the HP 16500C will read and write  
double-sided, double density or high-density disks in MS-DOS format,  
it is a useful tool for transferring images to and from IBM  
PC-compatible computers as well as other systems that can read and  
write MS-DOS format. You can save measurement configuration files,  
measurement results, and even menu and measurement images from  
the screen.  
This section shows you how to use the flexible disk drive to:  
save a measurement configuration  
load a measurement configuration  
save a trace list in ASCII format  
save a screen image (such as an oscilloscope display or menu)  
load system software  
If you need more information on the basic flexible disk drive  
operations, see the HP 16500C/16501A Logic Analysis System  
User’s Reference.  
3–3  
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To save a measurement configuration  
To save a measurement configuration  
You can save measurement configurations on a 3.5-inch disk or on the  
internal hard disk for later use. This is especially useful for automating  
repetitive measurements for production testing.  
1 Select System from the module field.  
2 Select Hard Disk or Flexible Disk from the menu field.  
3 Select Store from the disk operations field.  
4 Select the module for which you want to save the configuration from  
the module list.  
You can save the configuration for individual modules. The choice “System”  
saves only the mainframe configuration. The choice “All” saves the  
mainframe configuration and that of all measurement modules.  
5 Specify a file name into which to save the configuration using the “to  
file” field.  
6 Specify a descriptive comment for the file using the “file description”  
field.  
7 Select Execute.  
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File Management  
To save a measurement configuration  
Saving the Oscilloscope Configuration for Skew Testing  
If you want to save your file in a directory other than the root, you can select  
Change Directory from the disk operations field. Then type the name of the  
desired directory in the directory name field, or select it from the list of visible  
directories using the knob.  
3–5  
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File Management  
To load a measurement configuration  
To load a measurement configuration  
You can quickly load a previously saved measurement configuration, saving  
the trouble of manually setting up the measurement parameters for each  
module.  
1 Select System from the module field.  
2 Select Hard Disk or Flexible Disk from the Menu field.  
Your choice here depends on where you saved the configuration.  
3 Select Load from the disk operations field.  
4 Select the module for which you want to load a configuration from  
the module list.  
You can load configurations for individual modules. The choice “System”  
loads only the mainframe configuration. The choice “All” loads the mainframe  
configuration and that of all measurement modules.  
However, you can only load configurations that are defined in the  
configuration file itself. Thus, if you select System, then select a file that  
contains only an analyzer configuration, the configuration will fail.  
If you save an analyzer configuration as “All,” then attempt to reload that  
configuration into a particular measurement module, configuration will fail.  
Also, configurations are slot dependent. If you save a configuration for a  
particular module, rearrange the modules within the HP 16500C, then try to  
reload the configuration, the configuration will not load.  
5 Specify a file name from which to load the configuration using the  
“from file” field.  
6 Select Execute.  
3–6  
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File Management  
To load a measurement configuration  
Loading Configuration for all HP 16500C Modules and the System  
3–7  
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File Management  
To save a trace list in ASCII format  
To save a trace list in ASCII format  
Some HP 16500C displays, such as file lists and trace lists, contain columns of  
ASCII data that you may want to move to a PC for further manipulation or  
analysis. You can save these displays as ASCII files, using a procedure similar  
to that for creating graphics images. While a graphics capture saves only the  
data shown onscreen, saving the display as an ASCII file captures all data in  
the list, even if it is offscreen.  
1 Insert a DOS-formatted 3.5-inch disk in the flexible disk drive.  
2 Set up the menu you want to capture, or run a measurement from  
which you want to save data.  
Remember that only displays that present lists of textual data can be  
captured as ASCII files.  
3 Select Print Disk from the Print menu.  
4 Select the Filename field and specify a file name to which the screen  
will be printed.  
5 Select ASCII (ALL) from the Output Format field.  
If the current display contents can’t be saved as an ASCII file, this option will  
not be present in the Output Format field.  
6 Select Flexible Disk from the Output Disk menu.  
7 Select Execute.  
3–8  
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File Management  
To save a trace list in ASCII format  
68332EVS - State Listing  
Label  
ADDR  
CPU32 Mnemonic  
STAT  
__________ _____ ______________________________________ _________________  
0
1
2
3
4
5
6
7
8
406F4  
0FF7A  
0FF7C  
40992  
ANDI.L #********,(A6)+  
0004 data write  
Opcode Fetch  
Data Write  
Data Write  
Opcode Fetch  
Opcode Fetch  
Data Write  
06F6 data write  
BSR.B  
0004093E  
40994 nu MOVE.B ********,(****,A7)  
0FF76  
0FF78  
4093E  
40940  
40942  
40944  
40946  
40948  
4094A  
4094C  
4094E  
0004 data write  
0994 data write  
MOVE.W #03FF,00FFFA46  
03FF pgm read  
00FF pgm read  
FA46 pgm read  
MOVE.W #6B70,00FFFA72  
6B70 pgm read  
00FF pgm read  
FA72 pgm read  
RTS  
Data Write  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Data Read  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
40950 nu MOVE.L D1,-(A7)  
0FF76  
0FF78  
40994  
40996  
40998  
4099A  
0004 data read  
0994 data read  
MOVE.B 00020001,(0004,A7)  
0002 pgm read  
Data Read  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
Opcode Fetch  
0001 pgm read  
0004 pgm read  
Part of a Trace Listing Saved as an ASCII File  
3–9  
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File Management  
To save a menu or measurement as a graphic image  
To save a menu or measurement as a graphic image  
You can save menus and measurements to disk in one of four different  
graphics formats.  
1 Insert a DOS-formatted flexible disk in the flexible disk drive.  
2 Set up the menu whose image you want to capture, or run a  
measurement from which you want to save data.  
3 Select Print Disk from the Print menu.  
4 Select the Filename field and specify a file name to which the screen  
will be printed.  
5 Select the Output Format field and specify the output format for the  
graphics file.  
Choose one of the following formats:  
B/W TIF (SCREEN) is a black and white Tagged Image File Format file in  
TIFF version 5.0 format  
Color TIF (SCREEN) is a color TIFF file in TIFF version 5.0 format  
PCX (SCREEN) is a color PCX file (PCX is the PC Paintbrush and  
Publisher’s Paintbrush format from ZSoft)  
EPS (SCREEN) is a black and white Encapsulated PostScript file  
6 Select Flexible Disk from the Output Disk menu.  
7 Select Execute.  
3–10  
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File Management  
To save a menu or measurement as a graphic image  
An Oscilloscope Display Saved as a TIF Image  
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File Management  
To load system software  
To load system software  
1 Insert the first disk containing the system software.  
2 Select System from the module field.  
3 Select Hard Disk from the menu field.  
4 Select Change Directory from the disk operation field.  
5 Select the directory SYSTEM using the knob, and select Execute.  
6 Select Flexible Disk from the menu field.  
7 Select Copy from the disk operation field.  
8 Select the file you want to update using the knob, then select Execute.  
The selected file is copied to the \SYSTEM directory on the hard disk.  
Repeat steps 7 and 8 for all files you need to update. If you have more than  
one disk from which you want to copy files, turn the knob after changing  
disks. This ensures that the HP 16500C will read the directory on the new  
disk.  
3–12  
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Using the LAN Interface  
The LAN Interface of the HP 16500C extends the Logic Analysis  
System by making it look like a NFS (Network File System) node.  
Using NFS utilities for the PC or NFS on a UNIX workstation, you can  
transfer files to and from the HP 16500C as if it were a disk drive  
attached to your machine. The LAN Interface also creates virtual  
directories and files for measurement configurations and results, so  
you can store and retrieve these as though they were ordinary files.  
This section shows you how to use the LAN interface do the following:  
set up the HP 16500C configuration  
retrieve measurement data from a module in the HP 16500C  
transfer images of HP 16500C menu and result screens to your host  
computer  
If you have not connected your HP 16500C to the network, installed  
network software, or learned basic network commands, see the  
chapter on connecting to your LAN in the HP 16500C/16501A User’s  
Reference before performing the tasks in this chapter.  
3–13  
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File Management  
To set up the HP 16500C  
To set up the HP 16500C  
You can set up the HP 16500C from the front panel, or via the LAN. To set up  
the system via the LAN, you can use one of three methods:  
Copy a configuration file from your PC or workstation to one of the files  
called setup.raw in the HP 16500C directory tree.  
Remotely load a configuration file into the system from one of the local  
disk drives of the HP 16500C.  
Program the system directly, using the programming commands described  
in the optional HP 16500C System Programmer’s Guide.  
Example  
You want to load a configuration file called “486_bus” from your local  
computer into an HP 16550A state/timing module. The HP 16550A is installed  
in slot B of the HP 16500C mainframe. The mainframe is mounted on your  
network as disk drive L: (assuming you are using a PC as the host).  
To load the configuration file, enter the following at the DOS prompt:  
C:\> copy 486_bus L:\slot_b\setup.raw  
If you are using a UNIX system, you might use the cp command. In the  
Microsoft Windows environment, you can use the File Manager.  
3–14  
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File Management  
To set up the HP 16500C  
Example  
You want to load a configuration file called “486_bus” from the hard disk of  
the HP 16500C into an HP 16550A state/timing module. The HP 16550A is  
installed in slot B of the HP 16500C mainframe. To load the configuration file  
from the HP 16500C hard disk, you need to send the programming command  
to the analyzer. The syntax of the command is:  
:MMEMory:LOAD:CONFig <filename>[,<disk drive>][,<slot number>]  
In this case, the disk drive parameter, will be “INT0,” which indicates the  
hard disk. The slot number will be 2, because the HP 16550A is installed in  
slot B. To load the configuration file, enter the following command at the  
DOS prompt:  
C:\> echo :MEM:LOAD:CON ’486_BUS’,INT0,2 L:\system\program  
If you are using a UNIX system, you can use the UNIX echo command.  
See Also  
The HP 16500C System Programmer’s Guide for more information on  
programming command syntax.  
To copy files to the setup.raw file locations, or to send commands to the system  
at the \system\program file location, you must be connected to the HP 16500C  
system as the control user.  
3–15  
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File Management  
To transfer data files from the HP 16500C system to your computer  
To transfer data files from the HP 16500C system to  
your computer  
You can transfer data from the HP 16500C system to your PC or workstation  
by copying files. Data files in binary format are available in file locations  
\slot_x\data.raw. These binary files can be transferred to your computer and  
then reloaded into the HP 16500C system later.  
For some types of measurement modules, data files in ASCII format are also  
available. The ASCII data files are in file locations  
\slot_x\data.asc\{analyzer name}\{label name}.txt  
Depending on which measurement module you are using, there might not be  
a subdirectory corresponding to an analyzer name. There is an ASCII data file  
corresponding to each label name you have created in the measurement  
module.  
1 Set up the system for the measurement you want to make.  
You can do this from the front panel or remotely.  
2 Run the analyzer to acquire data.  
You can do this from the front panel or remotely.  
3 If you would like the data in binary format, copy the file data.raw to  
your computer from the file location \slot_{x}\data.raw  
The x represents the slot in which the measurement module is installed.  
4 If you would like the data in ASCII format, copy the files  
corresponding to the labels you want to view from the file location  
\slot_{x}\data.asc\{analyzer name}\{label name}.txt  
Depending on which measurement module you are using, there might not be  
a subdirectory corresponding to an analyzer name.  
3–16  
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File Management  
To transfer data files from the HP 16500C system to your computer  
Example  
You have an HP 16550A state/timing analyzer installed in slot C of your  
HP 16500C mainframe. The name of analyzer 1 of the HP 16550A is  
68000_BUS. You have created some labels under analyzer 1 of the  
HP 16550A, including one called “addr_lo.” The directory structure of the  
HP 16500C system looks like this:  
After setting up a measurement and acquiring data, you want to analyze the  
data for label addr_lo on your PC. To copy the ASCII data to your local  
computer, enter the following command at the DOS prompt:  
C:\ copy L:\slot_c\data.asc\68000_bus\addr_lo {local path  
name}  
If you are using a UNIX system, you might use the cp command. In the  
Microsoft Windows environment, you can use the File Manager.  
3–17  
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File Management  
To transfer graphics files from the HP 16500C system to your computer  
To transfer graphics files from the HP 16500C system  
to your computer  
The current display of the HP 16500C is available in four different formats.  
1 Set up the display you want to transfer.  
2 Copy the file in the format of your choice from the directory  
\system\graphics.  
The file screen.tif is a color Tagged Image File Format file, in TIFF version  
5.0 format.  
The file screenbw.tif is a black and white TIFF file in TIFF version 5.0  
format.  
The file screen.pcx is a color PCX file. (PCX is the standard format of PC  
Paintbrush and Publisher’s Paintbrush.)  
The file screenbw.epi is a black and white Encapsulated PostScript file in  
EPS version 3.0 format.  
You can also save the current display to a file on one of the local HP 16500C  
disk drives, using the Print to Disk function. You can then transfer the file  
from the HP 16500C drive to your computer.  
These graphics files contain the current display on the HP 16500C screen. The  
contents of the files change whenever you change the display. When you copy  
one of the graphics files, the display will freeze for a few moments while the  
HP 16500C is copying the current display.  
Example  
To copy a PCX picture of the current screen display to your computer, enter  
the following command at the UNIX command prompt:  
$ cp /logic/system/graphics/screen.pcx {local path name}  
If you are using a DOS system, you can use the copy command. In the  
Microsoft Windows environment, you can use the File Manager.  
3–18  
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4
Concepts  
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Concepts  
Understanding how the analyzer does its job will help you use it more  
effectively and minimize measurement problems. This chapter  
explains the general operation of the trigger sequencer and the  
inverse assembler.  
4–2  
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The Trigger Sequencer  
Logic state and timing analyzer modules for the HP 16500C have  
triggering and data storage features that allow you to capture only the  
system activity of interest. Understanding how these features work  
will help you set up analyzer trigger specifications that satisfy your  
measurement needs.  
There are several different logic analyzers available for the  
HP 16500C. This discussion will focus on the HP 16550A, a 100-MHz  
state/500-MHz timing analyzer. Most HP logic analyzers will be similar,  
differing only in the number of available states, pattern resources,  
range resources, and acquisition memory depth.  
In the HP 16550A state analyzer, the trigger sequencer is a state  
machine with a minimum of two states and a maximum of twelve  
states. The trigger term can be any one of these states except the last.  
The analyzer searches for a trigger sequence by matching input values  
on the pods to branch conditions, which control transitions between  
states. You can insert or delete states to make the trigger sequence as  
simple or complex as needed for your application.  
Trigger Sequence Specification  
See the following figure, which shows a sequence specification with  
four states. To define the trigger sequence, you specify  
sequence-advance, sequence-else, storage, and trigger-on  
specifications.  
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Concepts  
A sequence-else specification can  
branch to the same state...  
Sequence-advance  
specifications always  
branch to the next state.  
to a previous state...  
or a later state.  
Each state can have a  
unique storage  
specification.  
State Analyzer Sequencer with Four States  
Each state, except for the last, has two branch conditions. These are  
the sequence-advance and sequence-else specification. (The  
trigger-on specification is a special sequence-advance specification  
that is described in the section “TRIGGER On Specification.”)  
Sequence-Advance Specification  
The sequence-advance branch, sometimes called the “if” branch or  
primary branch, always branches to the next higher-numbered state.  
You can specify the following kinds of sequence-advance  
specifications:  
Find (or Then find) "<TERM>" <OCCURS> time(S)  
Find (or Then find) "<TERM>" <TIME PERIOD>  
If the Find (or Then find) “<TERM>” is found <OCCURS> number of  
times, the sequencer advances to the next sequence level.  
If the <TERM> remains stable for <TIME PERIOD>, the sequencer  
advances to the next sequence level.  
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Concepts  
Sequence-Else Specification  
The sequence-else branch, sometimes called the “else if” branch or  
secondary branch, may branch to any other state, including the  
current state, a previous state, or a later state. The sequence-else  
specification looks like the following:  
Else on "<TERM>" go to level <sequence level>  
If the Sequence-Else specification is satisfied before the  
sequence-advance specification is satisfied, the sequencer begins at  
<sequence level>.  
The last state may only have a sequence-else branch specification,  
which may branch to the same state or a prior state.  
Storage Specification  
In each state, a storage specification determines the data stored by  
the analyzer while it is searching for the sequence-advance,  
sequence-else, and trigger specifications. Storage specifications are  
defined using the same pattern, range, and timer resources available  
for defining branching specifications.  
While storing "anystate", "no state", or "<TERM>"  
Note that if you specify “no state,” the analyzer still stores  
sequence-advance terms and TRIGGER terms.  
TRIGGER On Specification  
If there are branch and storage specifications for each sequence level,  
what does the trigger term mean? The trigger term is a special  
sequence-advance specification in that, when found, it locks the  
contents of analyzer acquisition memory. The trigger can be  
positioned at the beginning, middle, or end of acquisition memory.  
The trigger specification can look like the following:  
TRIGGER on "<TERM>" <OCCURS> times  
TRIGGER on "<TERM>" <TIME PERIOD>  
If the trigger term is found <OCCURS> times, or if the trigger term  
remains stable for <TIME PERIOD>, the trigger is captured in  
memory. Then the sequencer advances to the next sequence level. If  
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Concepts  
you want to capture activity after the trigger is captured, define an  
additional sequence level and specify the desired storage qualification  
for post-trigger activity (for example, store “anystate”).  
Analyzer Resources  
The sequence-advance, sequence-else, storage, and trigger-on  
specifications are set by a combination of up to 10 pattern terms, 2  
range terms, and 2 timers. Different analyzer models may vary in the  
number of resources available.  
10 Pattern Terms  
The pattern terms, a through j, represent single states to be found on  
labeled sets of bits. For example, you could have an address on the  
address bits or a status on the status bits.  
2 Timers  
You can start, stop, continue, or pause the timers upon entry to a  
sequence state, then use a comparison of current timer value against a  
preset value to determine whether to branch to another state.  
2 Range Terms  
The range terms, Range1 and Range2, represent ranges of values to be  
found on labeled sets of bits. For example, you could have a range of  
addresses to be found on the address bus or a range of data values to  
be found on the data bus. Range terms are satisfied by any value  
within the range for “In_Range,” and any value outside the range for  
“Out_Range.”  
You can combine the pattern terms and range terms with logical  
operators to form complex pattern expressions in the  
sequence-advance, sequence-else, and TRIGGER on specifications.  
For example,  
Find "<TERM1>+<TERM2>" OR <TERM1> and <TERM2>  
Find "<TERM1>.<TERM2>" AND <TERM1> and <TERM2>  
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Concepts  
Where <TERM> can be a single value on a set of labels, any value  
within a range of values on a set of labels, or a glitch or edge transition  
on a bit or set of bits.  
Limitations Affecting Use of Analyzer Resources  
There are limitations on the way resources can be combined to form  
complex pattern expressions. Resources are combined in a four-level  
hierarchy. First, resources are divided into two groups. The groups  
can be combined with AND or OR. Second, within these groups,  
resources are combined into pairs. Pairs can also be logically  
combined using AND or OR. Third, individual resources are combined  
into pairs using AND, NAND, OR, NOR, XOR, NXOR. Fourth,  
individual resources may be included or excluded from participating  
in a pattern expression. You can also include the logical negation of  
the resource.  
The following table shows how resources are divided in the  
HP 16550A. Remember that some resources may not be available,  
depending on the analyzer configuration. For example, if you are  
using the analyzer as a state analyzer, the Edge1 and Edge2 resources  
are not available. If the timers are off, the Timer1 and Timer2  
resources are not available.  
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Concepts  
Table 4-1  
HP 16550A Resource Division  
Group  
Pair  
Resource Operation  
Resource  
Pair Links  
Group Link  
Group  
1
Pair 1  
Off, On, Negate  
Off, On, Negate  
Off, On, Negate  
a
b
c
Combine  
resources  
within  
pairs  
using  
AND,  
NAND, OR,  
XNOR  
Pair 2  
Pair 3  
Pair 4  
Pair 1  
Pair 2  
Pair 3  
Pair 4  
Off, In Range, Out of Range Range 1  
Off, On, Negate  
Off, On, Negate  
Off, On, Negate  
Off, <, >  
Off, On, Negate  
Off, On, Negate  
Off, On, Negate  
d
Combine  
pairs  
within  
groups or  
in group 1  
and group  
2 using  
Edge 1  
e
Timer 1  
f
g
h
Group  
2
Combine  
resources  
within  
pairs  
using  
AND,  
NAND, OR,  
NOR,  
AND or OR  
Off, In Range, Out of Range Range 2  
Off, On, Negate  
Off, On, Negate  
Off, On, Negate  
Off, <, >  
i
Edge 2  
j
Timer 2  
XNOR  
So, the following combinations are valid combinations for the state  
analyzer, if timers are on:  
(a+b) (In_Range2 + Timer2 > 400 ns)  
(c Out_Range1) + (f xor g)  
The following combinations are not valid, because resources cross pair  
boundaries:  
(a + c)  
(d + Timer1 < 400 ns)  
The first example shows that a and c cannot be combined at the first  
level. You can get around this, however, by combining them at the  
second level.  
4–8  
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Concepts  
The following figure shows the possible combinations of the a, b, c and  
Range1 terms:  
Combining a, b, c, and Range1 Terms  
The following combination is not valid, because pairs cross group  
boundaries:  
((a+b) + (h In_Range2)) (j xor Timer2 > 400 ns)  
Note that the analyzer interface will not allow you to enter invalid  
combinations, however, you need to be aware of what combinations  
are legal, so that you can make the desired measurement.  
Another limitation is that the analyzer cannot handle ranging for input  
pods that are assigned to different analysis IC’s. For example, if you  
need to define a 32-bit range term, you must do it using pods 1/2, 3/4,  
or 5/6. Trying to define a range across pods 2/3, 4/5, or 1/6 will not  
work.  
The Timing Analyzer  
When you configure the HP 16550A as a timing analyzer, the trigger  
sequencer is similar. However, there are between 1 and 10 states  
available. The trigger term is always the last state. There are two  
additional resources, Edge1 and Edge2. These can recognize  
occurrences of a glitch, or occurrences of a rising edge, falling edge,  
either edge, or no edge on a bit or ORed set of bits represented by a  
glitch/edge term.  
4–9  
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The Inverse Assembler  
When the analyzer captures a trace, it captures binary information.  
The analyzer can then present this information in binary, octal,  
decimal, hexadecimal, or ASCII. Or, if given information about the  
meaning of the data captured, the analyzer can inverse assemble the  
trace. The inverse assembler makes the trace list more readable by  
presenting the trace results in terms of processor opcodes and data  
transactions.  
The inverse assembly software needs five pieces of information:  
Address bus. The inverse assembler expects to see the label ADDR,  
with bits ordered in a particular sequence.  
Data bus. The inverse assembler expects to see the label DATA,  
with bits ordered in a particular sequence.  
Status. The inverse assembler expects to see the label STAT, with  
bits ordered in a particular sequence.  
Start state for disassembly. This is the first displayed state in the  
trace list, not the cursor position. See the figure below.  
Tables indicating the meaning of particular status and data  
combinations.  
When you press the Invasm key to begin inverse assembly of a trace,  
the inverse assembler begins with the first displayed state in the trace  
list. This is called synchronization. It looks at the status bits (STAT)  
and determines the type of processor operation, which is then  
displayed under the STAT label. If the operation is an opcode fetch,  
the inverse assembler uses the information on the data bus to look up  
the corresponding opcode in a table, which is displayed under the  
DATA label. If the operation is a data transfer, the data and  
corresponding operation are displayed under the DATA label. This  
continues for all subsequent states in the trace list.  
4–10  
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Concepts  
The inverse assembler  
synchronizes at the  
first line in the trace  
list...  
not at the cursor  
position  
Inverse Assembly Synchronization  
If you roll the trace list to a new position and press Invasm again, the  
inverse assembler repeats the above process. However, it does not  
work backward in the trace list from the starting position. This may  
cause differences in the trace list above and below the point where  
you synchronized inverse assembly. The best way to ensure correct  
inverse assembly is to synchronize using the first state you know to be  
the first byte of an opcode fetch.  
For processors with a pipeline or instruction queue, the information  
presented to the analyzer can potentially become confusing. Was an  
instruction executed or not? Active circuitry on some preprocessor  
models helps by sorting out the order of execution before presenting  
information to the analyzer. You can set switches on the preprocessor  
to control whether this dequeueing is enabled.  
4–11  
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Concepts  
Symbols  
When you specify symbols as the format for displaying the address bus in the  
trace list, the symbol lookup happens independently of inverse assembly. Thus,  
you can have symbols in the address field without inverse-assembled data and  
status. The HP E2450A symbol download utility allows you to download symbols  
from OMF (Object Module Format) files.  
See Also  
The Preprocessor User’s Guide for more information on switch  
settings.  
Chapter 5, “If You Have a Problem,” if you have problems using the  
inverse assembler.  
4–12  
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Configuration Translation for Analyzer Modules  
Configuration files provide an easy way for you to save and restore  
measurement setups, simplifying repeated measurements. However,  
sometimes you might change analyzer modules in the HP 16500C  
Logic Analysis System to gain additional measurement features. Or,  
you might want to use a configuration file from one HP 16500C system  
on another HP 16500C with a different analyzer module. But, the  
analyzer configuration files cannot be transferred directly from one  
type of analyzer to the next. Each analyzer has internal architectural  
differences, reflected in the number of pods, clock configurations,  
trigger sequencer features, analyzer resources, and so on.  
To help you move configuration files from one analyzer to another,  
some analyzer measurement modules for the HP 16500C Logic  
Analysis System support automatic translation of analyzer  
configurations. If you save an analyzer configuration from one kind of  
analyzer module, then load that configuration into a module that  
supports configuration translation, the translator will adjust the  
configuration as required to account for differences between the  
modules.  
The configuration translator needs to account for many aspects of the  
analyzer architecture. Some of the considerations are as follows:  
For some analyzers, demultiplexing data will require separate  
analyzer pods, because a master clock and a slave clock can’t be  
assigned on the same pod to perform the demultiplexing. The  
translator may display messages on the analyzer screen that ask  
you to reconnect pod cables in a different configuration.  
When a range term is split across multiple pods, the term must span  
adjacent odd/even pairs, starting with 1. Thus, terms could span  
pods 1 and 2, 3 and 4, 5 and 6, or 7 and 8, but not 2 and 3. Again,  
the translator may display messages asking you to reconnect cables  
in a different configuration.  
When loading a configuration into an analyzer with fewer pods than  
the one on which the configuration was saved, the translator must  
4–13  
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Concepts  
remove pod assignments. Which pods are removed from the  
configuration will depend on the widths of each pod in the original  
analyzer and new analyzer.  
The configuration translation also needs to account for many  
differences in the format and trace menus between the analyzers,  
including  
label names,  
polarities,  
thresholds,  
symbols,  
clocking,  
number of sequence levels,  
branch conditions, and  
patterns,  
among others.  
To ensure that trace measurements act as expected when you move  
configuration files from one analyzer to another, follow these  
recommendations:  
Ensure that the analyzer pods are hooked up as required by the  
configuration translation and the new analyzer. The onscreen  
messages given by the translator will help you identify which  
analyzer pods must be swapped. If you are using an HP  
preprocessor, the Preprocessor User’s Guide may contain  
information showing the cable connections for different analyzer  
modules.  
Review all trace format and trigger menu settings to verify that they  
will meet your measurement requirements. You should check label  
assignments, channel masks, pattern and range definitions,  
sequencer setup, and general analyzer configuration (which pods  
are mapped to each analyzer).  
4–14  
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Concepts  
When you move a configuration file from one analyzer to another, the trace data  
from previous measurements is not moved. If you need to store trace data for  
future reference, see “To save a trace list in ASCII format” in chapter 3.  
4–15  
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4–16  
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5
If You Have a Problem  
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If You Have a Problem  
Occasionally, a measurement may not give the expected results. If you  
encounter difficulties while making measurements, use this chapter to  
guide you through some possible solutions. Each heading lists a  
problem you may encounter, along with some possible solutions. Error  
messages which may appear on the logic analyzer are listed below in  
quotes “ ”. Symptoms are listed without quotes.  
If you still have difficulty using the analyzer after trying the  
suggestions in this chapter, please contact your local Hewlett-Packard  
service center.  
When you are working with the analyzer, be sure to power down both the  
analyzer and the target system before disconnecting or connecting cables,  
probes, and preprocessors. Otherwise, you may damage circuitry in the  
analyzer, preprocessor, or target system.  
CAUTION  
5–2  
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Analyzer Problems  
This section lists general problems that you might encounter while  
using the analyzer.  
Intermittent data errors  
This problem is usually caused by poor connections, incorrect signal levels, or  
marginal timing.  
Remove and reseat all cables and probes; ensure that there are no bent  
pins on the preprocessor interface or poor probe connections.  
Adjust the threshold level of the data pod to match the logic levels in the  
system under test.  
Use an oscilloscope to check the signal integrity of the data lines.  
Clock signals for the state analyzer must meet particular pulse shape and  
timing requirements. Data inputs for the analyzer must meet pulse shape and  
setup and hold time requirements.  
See Also  
See “Capacitive Loading” in this chapter for information on other sources of  
intermittent data errors.  
Unwanted triggers  
Unwanted triggers can be caused by instructions that were fetched but not  
executed.  
Add the prefetch queue or pipeline depth to the trigger address to avoid  
this problem.  
The depth of the prefetch queue depends on the processor that you are  
analyzing. Suppose you are analyzing a pipelined processor having fetch,  
decode, execute, and memory stages. The processor fetches 32-bit words. To  
ensure that the processor has begun executing a particular routine when the  
trigger occurs, set the trigger to the module entry address plus 08 hex. (This  
assumes that there is no immediate data in the instruction stream.)  
5–3  
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If You Have a Problem  
No Setup/Hold field on format screen  
No Setup/Hold field on format screen  
The HP 16540 and 16541 (A and D models), or HP 16542A logic analyzer  
cards are not calibrated. Refer to your logic analyzer reference manual for  
procedures to calibrate the cards.  
No activity on activity indicators  
On the HP 16510A Logic Analyzer, check the fuse that allows power to  
the preprocessor interface.  
On other logic analyzers, check for loose cables, board connections, and  
preprocessor interface connections.  
Check for bent or damaged pins on the preprocessor probe.  
Capacitive loading  
Excessive capacitive loading can degrade signals, resulting in incorrect  
capture by the preprocessor interface, or system lockup in the  
microprocessor. All preprocessor interfaces add additional capacitive loading,  
as can custom probe fixtures you design for your application.  
Careful layout of your target system can minimize loading problems and  
result in better margins for your design. This is especially important for  
systems that are running at frequencies greater than 50 MHz.  
Remove as many pin protectors, extenders, and adapters as possible.  
If multiple preprocessor interface solutions are available, try using one  
with lower capacitive loading.  
See Also  
Chapter 6 lists some application notes that discuss the problems of probing  
high-speed digital systems.  
5–4  
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If You Have a Problem  
No trace list display  
No trace list display  
If there is no trace list display, it may be that your analysis specification is not  
correct for the data you want to capture, or that the trace memory is only  
partially filled.  
Check your analysis sequencer specification to ensure that it will  
capture the events of interest.  
Try stopping the analyzer; if the trace list is partially filled, this should  
display the contents of trace memory.  
5–5  
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Preprocessor Problems  
This section lists problems that you might encounter when using a  
preprocessor. If the solutions suggested here do not correct the  
problem, you may have a defective preprocessor. Refer to the User’s  
Guide for your preprocessor for test procedures. Contact your local  
Hewlett-Packard Sales Office if you need further assistance.  
Target system will not boot up  
If the target system will not boot up after connecting the preprocessor  
interface, the microprocessor or the preprocessor interface may not be  
installed properly, or they may not be making electrical contact.  
Ensure that you are following the correct power-on sequence for the  
preprocessor and target system.  
1 Power up the analyzer and preprocessor.  
2 Power up the target system.  
If you power up the target system before you power up the preprocessor,  
interface circuitry in the preprocessor may latch up, preventing proper target  
system operation.  
Verify that the microprocessor and the preprocessor interface are  
properly rotated and aligned, so that the index pin on the  
microprocessor (such as pin 1 or A1) matches the index pin on the  
preprocessor interface.  
Verify that the microprocessor and the preprocessor interface are  
securely inserted into their respective sockets.  
Verify that the logic analyzer cables are in the proper sockets of the  
preprocessor interface and are firmly inserted.  
Reduce the number of extender sockets.  
See Also  
“Capacitive Loading” in this chapter.  
5–6  
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If You Have a Problem  
Slow clock  
Slow clock  
If you have the preprocessor interface hooked up and running and observe a  
slow clock or no activity from the interface board, the +5 V supply coming  
from the analyzer may not be getting to the interface board.  
To check the +5 V supply coming from the analyzer, disconnect one of  
the logic analyzer cables from the preprocessor and measure across pins  
1 and 2 or pins 39 and 40.  
If +5 V is not present, check the internal preprocessor fuse or current  
limiting circuit on the logic analyzer. For information on checking this fuse  
or circuit, refer to the Service Guide for your logic analyzer.  
If +5 V is present and the cable connection to the preprocessor appears  
sound, contact your nearest Hewlett-Packard Sales Office for information  
on servicing the board.  
Erratic trace measurements  
There are several general problems that can cause erratic variations in trace  
lists and inverse assembly failures.  
Ensure that the preprocessor configuration switches are correctly set  
for the measurement you are trying to make.  
Some preprocessors include configuration switches for various features (for  
example, to allow dequeueing of the trace list). See your Preprocessor  
User’s Guide for more information.  
5–7  
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If You Have a Problem  
Erratic trace measurements  
Try doing a full reset of the target system before beginning the  
measurement.  
Some preprocessor designs require a full reset to ensure correct  
configuration.  
Ensure that your target system meets the timing requirements of the  
processor with the preprocessor probe installed.  
See “Capacitive Loading” in this chapter. While preprocessor loading is slight,  
pin protectors, extenders, and adapters may increase it to unacceptable  
levels. If the target system design has poor timing margins, such loading may  
cause incorrect processor functioning, giving erratic trace results.  
Ensure that you have sufficient cooling for the preprocessor probe.  
Current processors such as the i486, Pentium , and MC68040 generate  
substantial heat. This is exacerbated by the active circuitry on the  
preprocessor board. You should ensure that you have ambient temperature  
conditions and airflow that meet or exceed the requirements of the  
microprocessor manufacturer.  
5–8  
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Inverse Assembler Problems  
This section lists problems that you might encounter while using the  
inverse assembler.  
When you obtain incorrect inverse assembly results, it may be unclear  
whether the problem is in the preprocessor or in your target system. If  
you follow the suggestions in this section to ensure that you are using  
the preprocessor and inverse assembler correctly, you can proceed  
with confidence in debugging your target system.  
No inverse assembly or incorrect inverse assembly  
This problem is due to incorrect synchronization, modified configuration,  
incorrect connections, or a hardware problem in the target system. A locked  
status line can cause incorrect or incomplete inverse assembly.  
Verify that the inverse assembler has been synchronized by placing an  
opcode at the top of the display (not at the input cursor) and pressing  
the Invasm key.  
Because the inverse assembler works from the first line of the trace display,  
if you jump to the middle of a trace and select Invasm, prior trace states are  
not disassembled correctly. If you move to several random places in the trace  
list and select Invasm each time, the trace disassembly is only guaranteed to  
be correct from the top of the display forward for each selection.  
Ensure that each analyzer pod is connected to the correct preprocessor  
cable.  
There is not always a one-to-one correspondence between analyzer pod  
numbers and preprocessor cable numbers. Preprocessors must supply  
address (ADDR), data (DATA), and status (STAT) information to the  
analyzer in a predefined order, so the cable connections for each  
preprocessor are often altered to support that need. Thus, one preprocessor  
might require that you connect cable 2 to analyzer pod 2, while another will  
require you to connect cable 5 to analyzer pod 2. See the User’s Guide for  
your preprocessor for further information.  
5–9  
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If You Have a Problem  
Inverse assembler will not load or run  
Check the activity indicators for status lines locked in a high or low  
state.  
Verify that the STAT, DATA, and ADDR format labels have not been  
modified from their default values.  
These labels must remain as they are configured by the configuration file. Do  
not change the names of these labels or the bit assignments within the labels.  
Some preprocessors also require other data labels; check your Preprocessor  
User’s Guide for more information.  
Verify that all microprocessor caches and memory managers have been  
disabled.  
In most cases, if the microprocessor caches and memory managers remain  
enabled you should still get inverse assembly, but it may be incorrect since  
some of the execution trace was not visible to the logic analyzer.  
Verify that storage qualification has not excluded storage of all the  
needed opcodes and operands.  
Inverse assembler will not load or run  
You need to ensure that you have the correct system software loaded on your  
analyzer.  
Ensure that the inverse assembler is on the same disk as the  
configuration files you are loading.  
Configuration files for the state analyzer contain a pointer to the location of  
the corresponding inverse assembler. If you delete the inverse assembler or  
move it to another location, the configuration process will fail.  
Make sure you are using the version of the inverse assembler software  
that corresponds to the operating system revision installed on your  
analyzer.  
See your Preprocessor User’s Guide for details.  
5–10  
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Intermodule Measurement Problems  
Some problems occur only when you are trying to make a  
measurement involving multiple modules.  
An event wasn’t captured by one of the modules  
If you are trying to capture an event that occurs very shortly after the event  
that arms one of the measurement modules, it may be missed, due to internal  
analyzer delays. For example, suppose you set the oscilloscope to trigger  
upon receiving a trigger signal from the logic analyzer, because you are trying  
to capture a pulse that occurs right after the analyzer’s trigger state. If the  
pulse occurs too soon after the analyzer’s trigger state, the oscilloscope will  
miss the pulse.  
Adjust the skew in the Intermodule menu.  
You may be able to specify a skew value that enables the event to be  
captured.  
Change the trigger specification for modules upstream of the one with  
the problem.  
If you’re using a logic analyzer to trigger the scope, try specifying a trigger  
state one state before the one you are using. This may be more difficult than  
working with the skew, because the prior state may occur more often and not  
always be related to the event you’re trying to capture with the oscilloscope.  
5–11  
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Messages  
This section lists some of the messages that the analyzer displays  
when it encounters a problem.  
“Default Calibration Factors Loaded” (HP 16540,  
16541, and 16542)  
The default calibration file for the logic analyzer was loaded. The logic  
analyzer must be calibrated when using HP 16540A/D, HP 16541A/D or  
HP 16542A cards. Refer to the Logic Analyzer Reference for procedures to  
calibrate the master clocking system, and ensure that the “cal factors” file is  
saved. Refer to the Logic Analyzer Reference manual for procedures to  
calibrate the cards.  
“. . . Inverse Assembler Not Found”  
This error occurs if you rename or delete the inverse assembler file that is  
attached to the configuration file. Ensure that the inverse assembler file is  
not renamed or deleted.  
5–12  
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If You Have a Problem  
“Measurement Initialization Error”  
“Measurement Initialization Error”  
This error occurs when you have installed the cables incorrectly for one or  
two HP 16550A logic analysis cards. The following diagrams show the correct  
cable connections for one-card and two-card installations. Ensure that your  
cable connections match the drawing, then repeat the measurement.  
Cable Connections for One-Card HP 16550A Installations  
Cable Connections for Two-Card HP 16550A Installations  
See Also  
The HP 16550A 100-MHz State/500-MHz Timing Logic Analyzer Service  
Guide.  
5–13  
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If You Have a Problem  
“No Configuration File Loaded”  
“No Configuration File Loaded”  
This is usually caused by trying to load a configuration file for one type of  
module or the system into a different type of module.  
Verify that the appropriate module has been selected from the Load  
{module} from File {filename} in the HP 16500 disk operation menu.  
Selecting Load {All} will cause incorrect operation when loading most  
preprocessor interface configuration files.  
See Also  
“To Load a Configuration File” in chapter 3, “File Management.”  
“Selected File is Incompatible”  
This occurs when you try to load a configuration file for the wrong module.  
Ensure that you are loading the appropriate configuration file for your logic  
analyzer.  
“Slow or Missing Clock”  
This error message might occur if the logic analyzer cards are not firmly  
seated in the HP 16500C or HP 16501A frame. Ensure that the cards are  
firmly seated.  
This error might occur if the target system is not running properly.  
Ensure that the target system is on and operating properly.  
If the error message persists, check that the logic analyzer pods are  
connected to the proper connectors. See the User’s Guide for your  
preprocessor interface to determine the proper connections.  
For HP 16510A Logic Analyzers, check the preprocessor interface power  
fuse in the logic analyzer.  
5–14  
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If You Have a Problem  
“State Clock Violates Overdrive Specification”  
“State Clock Violates Overdrive Specification”  
At least one 16-channel pod in the state analysis measurement stored a  
different number of states before trigger than the other pods. This is usually  
caused by sending a clocking signal to the state analyzer that does not meet  
all of the specified conditions, such as minimum period, minimum pulse  
width, or minimum amplitude. Poor pulse shaping could also cause this  
problem.  
The error message “State Clock Violates Overdrive Specification” should occur  
only for HP 16510A/B, and HP 16511B Logic Analyzers with the Clock Period field  
set to <60 ns. If this error message is observed with the Clock Period set to >60  
ns, you may have a faulty logic analyzer. If a failure is suspected in your logic  
analyzer, contact your nearest Hewlett-Packard Sales Office for information on  
servicing the instrument.  
“Time from Arm Greater Than 41.93 ms”  
The state/timing analyzers have a counter to keep track of the time from  
when an analyzer is armed to when it triggers. The width and clock rate of  
this counter allow it to count for up to 41.93 ms before it overflows. Once the  
counter has overflowed, the system does not have the data it needs to  
calculate the time between module triggers. The system must know this time  
to be able to display data from multiple modules on a single screen.  
5–15  
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If You Have a Problem  
“Waiting for Trigger”  
“Waiting for Trigger”  
If a trigger pattern is specified, this message indicates that the specified  
trigger pattern has not occurred. Verify that the triggering pattern is  
correctly set.  
When analyzing microprocessors that fetch only from long-word aligned  
addresses, if the trigger condition is set to look for an opcode fetch at an  
address not corresponding to a long-word boundary, the trigger will  
never be found.  
If a “don’t care” trigger condition is set, this message indicates:  
For an HP 16511B Logic Analyzer, only one of the two cards is receiving  
its state clock. Refer to “Slow or Missing Clock.”  
For an HP 16510A/B Logic Analyzer, the pattern duration is probably set  
to less than (<) instead of greater than (>). Since a “don’t care” pattern is  
always true, the “less than” condition is never satisfied. Set the trigger  
correctly for the measurement that is desired.  
5–16  
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6
Application Notes  
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Application Notes  
Hewlett-Packard has prepared several application notes and product  
notes that show you how to get more out of your HP 16500C Logic  
Analysis System. Each note focuses on a particular application or  
problem, showing you the components of the problem, the approach  
required to solve it, the instrumentation, and the measurement  
results.  
The following table lists the application notes and product notes  
relevant to the HP 16500C Logic Analysis System. To order, contact  
your local Hewlett-Packard Sales Office.  
Application Notes and Product Notes  
Note Number  
HP Part Number  
Title  
Description  
Application Note 392-3  
5952-3058  
VME/VXI Applications: How the  
Right Preprocessor Interface  
Can Simplify Logic Analysis  
Discusses how using a  
preprocessor with your logic  
analyzer can simplify  
measurements common to  
aerospace and defense.  
Application Note 1210-2  
5091-1800E  
Understanding and Minimizing  
Probing Effects  
Discusses probe loading effects  
in a digitizing oscilloscope  
measurement. Also applys to  
logic analyzers.  
Application Note 1223  
Application Note 1225-2  
5091-4121E  
5091-5446E  
Logic Analyzer Triggering  
Applications  
Shows a variety of different  
triggering examples using the  
HP 16550A state/timing analyzer.  
Cache Hit or Miss Analysis with  
the HP 16542A  
Shows how to analyze cache hit  
rate using the HP 16520A Pattern  
Generator with the HP 16542A  
deep memory state and timing  
module.  
6–2  
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Application Notes  
Note Number  
HP Part Number  
Title  
Description  
Application Note 1225-3  
5091-5447E  
Digital Video Testing with the  
HP 16542A  
Uses the deep memory of the  
HP 16542A with the complex  
triggering capabilities of that  
module and of the 16550A  
state/timing analyzer to capture  
and analyze data from a digital  
video stream.  
Application Note 1244-1  
Application Note 1244-2  
5962-8620E  
5091-8839E  
Minimizing Intrusion Effects  
When Probing with a Logic  
Analyzer  
Discusses physical and  
electrical considerations for  
probing circuits with an analyzer.  
Designing a Custom Interface  
for a Logic Analyzer Using HP  
User-Definable Design Tools  
Describes various HP tools for  
designing custom hardware and  
software interfaces to newer or  
less common chips and buses.  
Application Note 1261  
Application Note 1266-1  
5091-8798E  
5963-3544E  
Timing Charaterization Using the  
HP 16517/18A with Intel  
PentiumProcessor  
Discusses how the timing  
characterization of a digital  
system can be performed more  
efficiently with a high speed  
logic analyzer.  
Measurement Examples  
Intel 80960CA Software Debug  
Using a Logic Analyzer and an  
In-Circuit Debugger  
Explains how to integrate a logic  
analyzer with the MRI Debugger  
Monitor for the Intel 80960 CA  
processor.  
Product Note 16522-1  
Product Note 54720A-3  
5964-6347E  
5091-3758E  
Digital Verification with the  
HP 16522 Pattern Generator  
Shows how to use the pattern  
generator with the timing  
analyzer to do board verification.  
Selecting Oscilloscope Probes  
for High-Speed Digital Circuit  
Measurements  
Discusses loading effects of  
probes on digital circuitry. Very  
relevant to probing for logic  
state and timing analysis as well.  
6–3  
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6–4  
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Glossary  
acquisition Denotes one complete  
cycle of data gathering by a module.  
For example, in the HP 16532 oscillo-  
scope, one complete cycle gathers  
8000 samples of information and  
stores them in acquisition memory.  
cancel autoscale The field that al-  
lows you to cancel an autoscale  
command. This field is particularly  
important if you inadvertently select  
the Autoscale field when you have  
your measurement configuration set.  
Automatically scaling your signals at  
this point could change your present  
configuration.  
arm The arm output from a mod-  
ule is set false when the module  
begins running and is set true when  
the module finds its trigger condi-  
tion. Other measurement modules  
that take the arm signal as an input  
are unable to capture data or search  
for their triggers until they receive  
their arm signal. The arm signal is  
usually used to coordinate measure-  
ment start between two or more  
measurement modules.  
cancel run The field that allows  
you to cancel making an oscilloscope  
run for any reason once you have se-  
lected the Run field.  
coupling field The field that sets  
the input impedance for the signal  
applied to oscilloscope channels. For  
example, in the HP 16532A, the in-  
put coupling can be set to 1  
Mohm/DC, 1 Mohm/AC, and 50  
ohm/DC.  
attenuation factor See probe  
field.  
autoscale algorithm An algo-  
rithm for oscilloscope modules that,  
based on the amplitude and period  
of the signals found, sets the vertical  
sensitivity in volts per division, off-  
set, horizontal sweep speed in  
seconds per division, trigger level,  
and trigger slope for the trigger in-  
put. Its purpose is to set up the  
system so that two to five cycles of  
the input waveform are displayed on  
the screen. The waveform is from  
the lowest numbered and lettered  
channel with a signal.  
cross triggering Using inter-  
module capabilities to have  
measurement modules trigger each  
other. For example, you can have an  
external instrument arm a logic ana-  
lyzer, which subsequently triggers an  
oscilloscope when it finds the trigger  
state.  
delay field The field that sets the  
horizontal position of the waveform  
on the screen for the oscilloscope  
and timing analyzer. Delay time is  
measured from the trigger point. It is  
measured in seconds, can be viewed  
Glossary–1  
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Glossary  
in the Delay field, and is set by using  
the knob or the keypad.  
glitch A glitch is defined as two or  
more transitions crossing the logic  
threshold between consecutive tim-  
ing analyzer samples.  
deskewing To cancel or nullify the  
effects of differences between two  
different internal delay paths for a  
signal. Deskewing is normally done  
by routing a single test signal to the  
inputs of two different modules, then  
adjusting the delay path to one of  
the modules so that both modules  
recognize the signal at the same  
state at the same time.  
high The most-positive portion of a  
logic signal. In pattern trigger meas-  
urements for the oscilloscope, it is  
represented by an H in the pattern  
selector.  
horizontal position See delay  
field.  
don’t care Signifies that the state  
of the signal, high or low, is not rele-  
vant to the measurement. That is,  
the analyzer will ignore the state of  
this signal when determining  
whether a match occurs on an input  
label. Don’t cares are represented by  
the X character in analyzer resource  
terms.  
horizontal sweep speed In the  
oscilloscope, the time value that de-  
termines horizontal scaling of the  
waveform to be displayed on the  
screen. It is measured in seconds per  
division and is viewed in the s/Div  
field. It is set by using the knob or  
the keypad.  
immediate mode In the oscillo-  
scope, the trigger mode that does  
not require a specific trigger condi-  
tion (that is, an edge or a pattern).  
edge mode In the oscilloscope,  
this is the trigger mode that causes a  
trigger based on a single channel  
edge (either rising or falling).  
input field In the oscilloscope, the  
field that allows you to select a chan-  
nel for vertical scaling.  
glitch/edge terms Timing ana-  
lyzer resources that allow detection  
of transitions on a signal. A  
glitch/edge term can be set to detect  
a rising edge, falling edge, either  
edge, no edge, or glitch (very short  
duration pulse) on an input signal.  
See also glitch.  
input impedance See coupling  
field.  
intermodule menu The menu  
that allows you to set up the instru-  
Glossary–2  
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Glossary  
ment to make interactive measure-  
ments, either with other modules in  
the mainframe or with external mod-  
ules.  
offset field For the oscilloscope,  
the field that sets the vertical posi-  
tion of the waveform on the screen.  
Offset is the voltage represented at  
the center vertical tick mark in the  
waveform display. It is measured in  
labels Labels are the names of  
pods/bits that are used to identify sig- volts and is viewed in the Offset  
nal channels or buses. A label is  
assigned to identify a bit or set of  
bits.  
field. It is set by using the knob or  
the keypad.  
panning The action of moving the  
waveform along the timebase by  
varying the delay value in the Delay  
field. This action allows you to con-  
trol the portion of acquisition  
low The most-negative portion of a  
logic signal. Used in pattern trigger  
measurements, it is represented by  
an L in the pattern selector.  
memory that will be displayed on the  
screen. If you choose, you can view  
the entire waveform record in acqui-  
sition memory. This is normally done  
in single-shot mode.  
manual markers mode The  
marker mode for the timing analyzer  
and oscilloscope that lets you manu-  
ally move the markers using the  
knob or the keypad. It is accessed by  
selecting the Markers field.  
pattern mode For the oscillo-  
scope, the trigger mode that allows  
you to set oscilloscope to trigger on  
a specified combination of input sig-  
nal levels. Contrast pattern terms.  
menu field The field to the imme-  
diate right of the module field (see  
module field). It allows you to  
choose the menus related to the  
module shown in the module field.  
pattern terms Analyzer resources  
that represent single states to be  
found on labeled sets of bits; for ex-  
ample, an address on the address  
bus or a status on the status lines.  
module field The field in the up-  
per-left corner of the screen. It  
allows you to choose any of the mod-  
ules in the mainframe as the working  
module. It also allows you to choose  
system options and intermodule op-  
tions.  
probe field For the oscilloscope,  
the field that sets the probe attenu-  
ation factor. For example, in the  
HP 16532A, the input attenuation  
Glossary–3  
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Glossary  
can be set from 1:1 to 1000:1 in incre- sequence-else specification In  
ments of 1.  
the analyzers, the combination of pat-  
terns that will cause the trigger  
range terms In the analyzer, the  
range terms represent ranges of val-  
ues to be found on labeled sets of  
bits. For example, a range of ad-  
dresses to be found on the address  
bus or a range of data values to be  
found on the data bus. Range terms  
are satisfied by any value within the  
range for “In_Range,” and by any  
value outside the range for  
sequencer to transition to another se-  
quencer state from the current state,  
if the sequence-advance specifica-  
tion has not been found to this point.  
sequence The logic analyzer trig-  
ger sequencer is a state machine  
that determines when the analyzer  
will trigger. All of the transition  
matches that lead to the trigger state  
must be satisfied before the analyzer  
will trigger. The sequence is defined  
by the sequence-advance, sequence-  
else, and storage specifications  
currently in effect.  
“Out_Range.”  
repetitive mode The field that  
causes the selected measurement  
modules to begin the next acquisi-  
tion as soon as the previous  
acquisition is completed and dis-  
played.  
single mode The field that causes  
a measurement module or system of  
measurement modules to make a sin-  
gle data acquisition, then display the  
results of that acquisition on the  
screen. In this mode, you must select  
the Run field each time you want a  
new acquisition and corresponding  
screen update.  
run, repetitive mode See repeti-  
tive mode.  
run, single mode See single mode.  
s/Div See horizontal sweep speed.  
sequence-advance specification  
In the analyzers, the combination of  
patterns, occurrences, and time that  
must be satisfied before the trigger  
sequencer will advance from the cur-  
rent sequencer state to the next  
higher-numbered sequencer state.  
skew Skew is the difference in  
channel delays between measure-  
ment channels. Typically, skew  
between modules is caused by differ-  
ences in designs of measurement  
channels, and differences in charac-  
teristics of the electronic  
components within those channels.  
Glossary–4  
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Glossary  
You should adjust measurement mod- qualify only storage of a routine of in-  
ules to eliminate as much skew as  
possible so that it does not affect the  
accuracy of your measurements.  
terest, or qualify only writes to a  
variable.  
terms Terms are the names of val-  
ues that can be used in trigger  
source field In the oscilloscope,  
the field that allows you to select a  
channel for edge triggering and trig-  
ger level setting.  
sequences. A term can be a single  
value on a label or set of labels, any  
value within a range of values on a la-  
bel or set of labels, or a glitch or  
edge transition on a bit or set of bits.  
See Also pattern terms, range terms,  
and glitch/edge terms.  
state sequence levels The indi-  
vidual states for the trigger  
sequencer in the state analyzer. For  
example, the HP 16550A has twelve  
states in its trigger sequencer. Each  
state has a sequence-advance specifi-  
cation and sequence-else  
specification, which specify the con-  
ditions the analyzer must find to  
transition from state to state. One of  
the states is the trigger term (see  
trigger). Each state also specifies the  
data which the analyzer will store  
while in that state looking for the se-  
quence-advance and sequence-else  
specifications.  
timing sequence levels Similar  
to state sequence levels. However,  
the analyzer configuration may be  
such that there are different num-  
bers of state and timing sequence  
levels. See also state sequence levels.  
toggle field A dark-blue field that  
has only two options. When you se-  
lect the field, the current option in  
that field will change (toggle) to its  
other option.  
storage qualification Store quali-  
fication allows you to specify the  
type of information to be stored in  
memory. Use store qualification to  
prevent memory from being filled  
with unwanted activity. When you  
begin to troubleshoot a problem, you  
will probably want to qualify storage  
of all activity. As you understand the  
problem better, you may want to  
touch-sensitive screen Any dark-  
blue field on the screen is a  
“selectable” field. When you touch a  
dark-blue field, the field toggles to  
another option, a pop-up menu ap-  
pears, or the field turns light-blue to  
activate the control knob on that  
field.  
Glossary–5  
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Glossary  
memory to this point and fills remain-  
ing locations with subsequent states,  
then stops acquiring data.  
trigger Trigger is a reference  
event around which you want to  
gather information. In the analyzer,  
you might want to trigger on a glitch  
in hardware or entry to a subroutine  
in software. When beginning, you  
might want to trigger on the first oc-  
currence of any kind (trigger on  
“anystate”). As you learn more about  
the problem you are trying to isolate,  
you may enter more specific trigger  
conditions. When you want to gather  
a continuous stream of activity lead-  
ing up to a system crash, you will  
want to trigger on “no state.” Note  
that some microprocessors fetch in-  
structions on 32-bit boundaries. If  
you are tracing activity of one of  
these processors, and you specify  
trigger on an address that is not on a  
32-bit boundary, that address will  
never appear on the address bus;  
therefore, the analyzer will never  
find its trigger. Make sure you spec-  
ify triggers that the analyzer will  
find. The state analyzer, timing ana-  
lyzer, and oscilloscope cannot  
trigger point In the oscilloscope,  
the point at which the voltage on the  
input waveform equals the trigger  
level voltage value set in the Level  
field of the trigger menu.  
trigger position Trigger position  
specifies where you want the trigger  
to be placed in memory. “Start”  
places the trigger at the start of  
memory and fills the remainder of  
memory with activity that occurs af-  
ter the trigger is captured. “Center”  
places the trigger in the center of  
memory and fills the first half of  
memory with activity that occurs be-  
fore the trigger, and the last half of  
memory with activity that occurs af-  
ter the trigger. “End” places the  
trigger at the end of memory and fills  
the remainder of memory with activ-  
ity that occurs before the trigger.  
“User-Defined” lets you specify cap-  
ture of a desired amount of  
posttrigger activity. Once a trigger is  
found by a state or timing analyzer,  
it is identified as the occurrence at  
analyzer memory location 0. All  
other states in memory are num-  
bered to show their occurrence  
relative to the trigger location: states  
captured before the trigger are num-  
bered with negative numbers (-001,  
complete their measurement unless  
they find a trigger.  
TRIGGER on specification  
A
special kind of sequence-advance  
specification for the analyzer. When  
the analyzer finds combination of  
patterns, occurrences, and time  
matching the trigger on term, it  
locks the contents of acquisition  
Glossary–6  
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Glossary  
-002, etc), and states captured after  
the trigger are numbered with posi-  
tive numbers (001, 002, etc).  
vertical position See offset field.  
V/div See vertical sensitivity  
vertical sensitivity In the oscillo-  
scope, the voltage value that  
determines the amplitude of the  
waveform on the screen. It is meas-  
ured in volts per division and is  
viewed in the V/div field. You change  
the vertical sensitivity using the  
knob or the keypad.  
when field In the oscilloscope,  
part of the Pattern Mode menu. It is  
a toggle field that allows you to  
choose whether to trigger on the se-  
lected pattern when it is entered or  
exited.  
zooming In the oscilloscope or tim-  
ing analyzer, to expand and contract  
the waveform along the time base by  
varying the value in the s/Div field.  
This action allows you to select spe-  
cific portions of a particular  
waveform in acquisition memory that  
will be displayed on the screen. You  
can view any portion of the wave-  
form record in acquisition memory.  
Zooming and panning are useful in  
displaying single-shot waveforms.  
Glossary–7  
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Glossary–8  
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Index  
A
E
Independent modules, 2–4  
Initialization code, 1–6  
Activation record, 1–6  
Address bus, 4–10  
Address ranges, 1–3  
Analyzer  
Else-if branch, 4–5  
Encapsulated PostScript files, 3–10  
Entry address, 1–3  
Error Messages, 5–12  
External instrument  
starting or stopping, 2–8  
Interleaved trace lists, 2–21  
Intermodule bus arming signals, 2–2  
Intermodule Measurement problems, 5–11  
an event wasn’t captured, 5–11  
Intermodule Measurements, 2–2  
adjust for minimum skew, 2–28  
independent state and timing analyzers,  
2–14  
seeing the status of a module, 2–10  
time correlation, 2–12  
Intermodule menu, 2–4  
Internal clock, 2–12  
Interrupt processing, 2–16  
Invasm key, 4–10  
concepts, 4–2  
Analyzer problems, 5–3  
capacitive loading, 5–4  
intermittent data errors, 5–3  
no activity on activity indicators, 5–4  
no setup/hold field on format screen, 5–4  
unwanted triggers, 5–3  
Anystate, 1–5, 2–4, 4–5  
Arm input, 2–2  
Arm level, 1–24  
Arm signal, 1–23  
Arming Control menu  
See Intermodule Measurements  
ASCII format, 3–16  
F
Falling edge, 2–6  
File description, 3–4  
File management, 3–2  
File manager, 3–18  
File name, 3–4  
First statement, 1–3  
Flexible disk, 3–8  
Flexible disk actions, 3–3  
Function entry triggering, 1–8  
Inverse Assembler, 4–2, 4–10  
Inverse Assembler problems, 5–9  
incorrect inverse assembly, 5–9  
inverse assembler will not load or run,  
5–10  
files, 3–16  
G
Asynchronous interrupt request  
trigger on, 2–16  
Glitch detection  
"*", 2–14 to 2–15  
timing analyzer, 2–14  
Glitch waveforms, 2–2, 2–15  
Graphics files  
no inverse assembly, 5–9  
B
L
Binary format, 3–16  
Branch conditions, 4–4  
Bus contention, 1–21  
LAN Interface files, 3–13  
Loop iteration triggering, 1–5  
B/W TIF, 3–10  
color TIF, 3–10  
EPS, 3–10  
M
C
PCX, 3–10  
transferring, 3–18  
power down analyzer and target system, Graphics images, 3–10  
Manual acquisition mode, 2–14  
Masked interrupts, 2–16  
Maximum states, 4–3  
Measurement configurations  
loading, 3–6  
Cautions  
5–2  
Ground bounce, 2–14  
Group boundaries, 4–9  
Group Run Armed from PORT IN field, 2–6 saving, 3–4  
Group Run field, 2–4  
Group Run tree  
arming modules, 2–4  
Group runs, 2–6  
Groups, 4–7  
Chip select lines, 2–20  
Configuration tree  
arming modules, 2–4  
Control signals, 1–24  
Coprocessor systems  
debugging, 2–19  
Menus  
saving as graphics images, 3–10  
Minimum states, 4–3  
Mixed Display mode, 2–21  
Module delays  
Cross arming  
See Intermodule Measurements  
skew adjustment accuracy, 2–26  
Modules  
H
Running status, 2–10  
status interpretation, 2–10  
Stopped status, 2–10  
Handshake violation, 1–20  
D
Data  
triggering on bad, 1–10  
Data bus, 4–10  
Data files  
I
I/O activity, 2–20  
If branch, 4–4  
Independent clocks, 2–22  
in ASCII format, 3–16  
in binary format, 3–16  
Independent lookup, 4–12  
Index–1  
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Index  
N
S
T
NFS node, 3–13  
No state, 1–3, 4–5  
Non-reference channel, 2–26  
Saving  
Test PC boards  
menus or measurements as graphics  
images, 3–10  
when no board-test system is available,  
2–17  
Not, 4–5  
to a flexible disk or internal drive, 3–4  
Screen display  
TIFF files, 3–10  
Time  
graphics files, 3–18  
Screen images, 3–2  
Secondary branch, 4–5  
Sequence-advance specification, 1–2  
Sequence-else specification, 1–2  
Sequential trigger, 1–2  
Set up  
HP 16500C, 3–14  
Signals  
inserting and deleting, 2–24  
Skew, 2–26  
adjust for minimum, 2–28  
comparison, 2–28  
removal, 2–28  
testing signal, 2–27  
Stacks  
verifying correct storage, 1–12  
Start state, 4–10  
counted implicitly, 2–24  
Time correlation, 2–12  
Time correlation bars, 2–12  
Time markers, 2–24  
Time stamps, 2–22  
Timer Control Field, 1–11, 1–16  
O
Onscreen keypad, 2–6  
Output Disk menu, 3–8  
Output Format field, 3–8  
P
Timers, 4–6  
Trace lists  
Pair boundaries, 4–8  
Pairs, 4–7  
Pattern expression, 4–7  
Pattern generators, 2–17  
Pattern terms, 4–6  
PC Paintbrush files, 3–10  
Pipelining  
add depth to start address, 1–4  
PORT IN BNC connector, 2–6  
PORT IN BNC level, 2–6  
PORT IN/OUT Field, 2–6  
Port input line, 2–2  
PORT OUT choices, 2–8  
Preprocessor problems, 5–6  
erratic trace measurements, 5–7  
slow clock, 5–7  
indented line numbers, 2–22  
interleaving, 2–20 to 2–22  
saving in ASCII format, 3–8  
viewing with waveforms, 2–25  
Transferring  
graphics files, 3–18  
Trigger sequencer, 4–2 to 4–3  
Trigger term, 4–5  
Triggering  
after status bus lines finish transitioning,  
1–13  
menus, 1–2  
on a count down of a set of data lines, 2–18  
on a handshake violation, 1–20  
on a loop that runs too long, 1–11  
on a timing violation, 1–23  
on anything, 2–6  
on asserting chip select lines, 1–14  
on bad data, 1–10  
on bus contention, 1–21  
on control and status signals, 1–24  
on entry to a function, 1–8  
on interrupt request, 2–16  
on loop iteration, 1–5  
on pulse limits, 1–18  
on recursive function call, 1–6  
on subroutine execution, 1–3  
on the arm signal, 2–6  
when expected data does not appear, 1–16  
Triggers  
State analyzer  
invalid combinations, 4–8  
valid combinations, 4–8  
State analyzers  
using two to monitor coprocessors, 2–20  
State flow, 2–16  
target system will not boot up, 5–6  
Print to disk, 3–18  
Problems, 5–2  
Product Notes, 6–2  
Pulse limits  
State listings  
inserting, 2–24  
State sequence level, 1–2  
Status, 4–10  
Status signals, 1–24  
Stimulus response, 2–17  
Store qualification, 1–2  
Storing  
configuration files, 3–2  
Subroutine execution  
storing and timing, 1–3  
Subroutines  
triggering on execution, 1–3  
verifying storage before exiting, 1–12  
Symbols, 4–12  
test minimum and maximum, 1–18  
R
Range terms, 4–6  
Rear panel input signal, 2–6  
Recursive call triggering, 1–6  
Reference channel, 2–26  
Registers  
verifying correct storage, 1–12  
Repetitive measurements  
automating, 3–4  
position at any state, 2–14  
Resources, 4–7  
Rising edge, 2–6  
Synchronization, 4–10  
Index–2  
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Index  
V
Verifying  
chip select line is strobed, 1–15  
correct execution, 1–3  
correct storage, 1–12  
efficiency, 1–3  
Viewing  
trace lists and waveforms together, 2–25  
W
Watchdog timer behavior, 2–20  
Waveforms  
deleting, 2–27  
inserting, 2–27  
viewing with trace lists, 2–25  
Index–3  
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Index–4  
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© Copyright Hewlett-  
Packard Company 1987,  
1990, 1993, 1994, 1996, 1997  
All Rights Reserved.  
Safety  
This apparatus has been  
designed and tested in  
Safety Symbols  
Service instructions are for  
trained service personnel. To  
avoid dangerous electric  
shock, do not perform any  
service unless qualified to do  
so. Do not attempt internal  
service or adjustment unless  
another person, capable of  
rendering first aid and  
accordance with IEC  
Instruction manual symbol:  
the product is marked with  
this symbol when it is  
necessary for you to refer to  
the instruction manual in  
order to protect against  
damage to the product.  
Publication 348, Safety  
Requirements for Measuring  
Apparatus, and has been  
supplied in a safe condition.  
This is a Safety Class I  
instrument (provided with  
terminal for protective  
earthing). Before applying  
power, verify that the correct  
safety precautions are taken  
(see the following warnings).  
In addition, note the external  
markings on the instrument  
that are described under  
"Safety Symbols."  
Reproduction, adaptation, or  
translation without prior  
written permission is  
prohibited, except as allowed  
under the copyright laws.  
resuscitation, is present.  
If you energize this  
instrument by an auto  
transformer (for voltage  
reduction), make sure the  
common terminal is  
connected to the earth  
terminal of the power source.  
Pentium is a U.S. trademark  
of Intel Corporation.  
Hazardous voltage symbol.  
Document Warranty  
The information contained in  
this document is subject to  
change without notice.  
Whenever it is likely that  
the ground protection is  
impaired, you must make the  
instrument inoperative and  
secure it against any  
Earth terminal symbol: Used  
to indicate a circuit common  
connected to grounded  
chassis.  
Hewlett-Packard makes  
no warranty of any kind  
with regard to this  
material, including, but  
not limited to, the implied  
warranties of  
merchantability or fitness  
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Hewlett-Packard shall not be  
liable for errors contained  
herein or for damages in  
connection with the  
Warning  
Before turning on the  
instrument, you must connect  
the protective earth terminal  
of the instrument to the  
protective conductor of the  
(mains) power cord. The  
mains plug shall only be  
inserted in a socket outlet  
provided with a protective  
earth contact. You must not  
negate the protective action  
by using an extension cord  
(power cable) without a  
protective conductor  
unintended operation.  
Do not operate the  
WARNING  
instrument in the presence of  
flammable gasses or fumes.  
Operation of any electrical  
instrument in such an  
The Warning sign denotes a  
hazard. It calls attention to a  
procedure, practice, or the  
like, which, if not correctly  
performed or adhered to,  
could result in personal  
environment constitutes a  
definite safety hazard.  
Do not install substitute  
furnishing, performance, or  
use of this material.  
injury. Do not proceed  
parts or perform any  
beyond a Warning sign until  
the indicated conditions are  
fully understood and met.  
unauthorized modification to  
the instrument.  
(grounding). Grounding one  
conductor of a two-conductor  
outlet is not sufficient  
Capacitors inside the  
instrument may retain a  
charge even if the instrument  
is disconnected from its  
source of supply.  
CAUTION  
protection.  
The Caution sign denotes a  
hazard. It calls attention to  
an operating procedure,  
practice, or the like, which, if  
not correctly performed or  
adhered to, could result in  
damage to or destruction of  
part or all of the product. Do  
not proceed beyond a  
Only fuses with the  
required rated current,  
voltage, and specified type  
(normal blow, time delay,  
etc.) should be used. Do not  
use repaired fuses or  
Use caution when exposing  
or handling the CRT.  
Handling or replacing the  
CRT shall be done only by  
qualified maintenance  
personnel.  
short-circuited fuseholders.  
To do so could cause a shock  
of fire hazard.  
Caution symbol until the  
indicated conditions are fully  
understood or met.  
Hewlett-Packard  
P.O. Box 2197  
1900 Garden of the Gods Road  
Colorado Springs, CO 80901  
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Product Warranty  
This Hewlett-Packard  
product has a warranty  
against defects in material  
and workmanship for a period  
of one year from date of  
shipment. During the  
No other warranty is  
expressed or implied.  
Hewlett-Packard  
specifically disclaims the  
implied warranties of  
merchantability or fitness  
for a particular purpose.  
About this edition  
This is the HP 16500C Logic  
Analysis System User’s  
Guide.  
Publication number  
16500-97022, August 1997  
Printed in USA.  
warranty period,  
Exclusive Remedies  
Hewlett-Packard Company  
will, at its option, either  
repair or replace products  
that prove to be defective.  
The remedies provided herein  
are the buyer’s sole and  
exclusive remedies.  
Print history is as follows:  
16500-97016, November 1996  
Hewlett-Packard shall not be  
liable for any direct, indirect,  
special, incidental, or  
consequential damages,  
whether based on contract,  
tort, or any other legal theory.  
For warranty service or  
repair, this product must be  
returned to a service facility  
designated by  
New editions are complete  
revisions of the manual.  
Many product updates do not  
require manual changes and  
manual corrections may be  
done without accompanying  
product changes. Therefore,  
do not expect a one-to-one  
correspondence between  
product updates and manual  
updates.  
Hewlett-Packard.  
For products returned to  
Hewlett-Packard for warranty  
service, the Buyer shall  
prepay shipping charges to  
Hewlett-Packard and  
Hewlett-Packard shall pay  
shipping charges to return  
the product to the Buyer.  
However, the Buyer shall pay  
all shipping charges, duties,  
and taxes for products  
Assistance  
Product maintenance  
agreements and other  
customer assistance  
agreements are available for  
Hewlett-Packard products.  
For any assistance, contact  
your nearest Hewlett-Packard  
Sales Office.  
returned to Hewlett-Packard  
from another country.  
Certification  
Hewlett-Packard warrants  
that its software and firmware  
designated by  
Hewlett-Packard for use with  
an instrument will execute its  
programming instructions  
when properly installed on  
that instrument.  
Hewlett-Packard does not  
warrant that the operation of  
the instrument software, or  
firmware will be  
Hewlett-Packard Company  
certifies that this product met  
its published specifications at  
the time of shipment from the  
factory. Hewlett-Packard  
further certifies that its  
calibration measurements are  
traceable to the United States  
National Institute of  
Standards and Technology, to  
the extent allowed by the  
Institute’s calibration facility,  
and to the calibration  
uninterrupted or error free.  
facilities of other  
Limitation of Warranty  
International Standards  
Organization members.  
The foregoing warranty shall  
not apply to defects resulting  
from improper or inadequate  
maintenance by the Buyer,  
Buyer-supplied software or  
interfacing, unauthorized  
modification or misuse,  
operation outside of the  
environmental specifications  
for the product, or improper  
site preparation or  
maintenance.  
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