LXD386 — Evaluation Board for
Quad T1/E1 Applications
Developer Manual
January 2001
As of January 15, 2001, this document replaces the Level One document
Order Number: 249215-001
LXD386 — Evaluation Board for Quad T1/E1 Applications User Guide.
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Contents
General Description ..................................................................................................5
1.1 Features ................................................................................................................5
Overview........................................................................................................................7
LXD386 Packing List.............................................................................................7
Equipment Requirements......................................................................................7
Control Modes.......................................................................................................7
Factory Settings ....................................................................................................8
Power Connections ...............................................................................................9
Hardware Mode Selection.....................................................................................9
Loopback Mode Selection.....................................................................................9
Clock Edge Selection ............................................................................................9
Output Enable Selection......................................................................................10
Code Selection....................................................................................................10
Monitoring Address Selection..............................................................................10
Jitter Attenuator Selection ...................................................................................10
Line Buildout Selection........................................................................................11
Master Clock Setup.............................................................................................11
JTAG Boundary Scan Port..................................................................................12
Framer/ASIC Connection ....................................................................................12
LED Indicators.....................................................................................................13
Line Interface.......................................................................................................13
Board Protection..................................................................................................13
i8051 Microcontroller Board ................................................................................14
Evaluation Board Set-up .....................................................................................14
Test Equipment Connections ..............................................................................14
Power Connections .............................................................................................14
Software Installation and Start-Up.......................................................................15
Hardware Set-up Screen.....................................................................................15
Quitting the Program ...........................................................................................15
Configuration Screen...........................................................................................16
Registers ............................................................................................16
Exit .....................................................................................................17
Registers Screen.................................................................................................18
Status Indicators.................................................................................18
Control Buttons...................................................................................18
Interrupts ............................................................................................18
Reset..................................................................................................18
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Evaluation Board Schematics.............................................................................20
Figures
LXD386 Evaluation Board.....................................................................................6
Default Switch Settings ......................................................................................11
Jumper Block JP5 ...............................................................................................12
Jumper Block JP2 ...............................................................................................12
Jumper Block JP 31 ............................................................................................13
Hardware Set-up Screen.....................................................................................16
Configuration Screen ..........................................................................................17
Registers Screen.................................................................................................19
Evaluation Board Schematic — Analog ..............................................................24
Evaluation Board Schematic — Digital I/O..........................................................25
Tables
LOOP/DLOOP Switch Settings.............................................................................9
JP5 Jumper Settings...........................................................................................11
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LXD386 — Evaluation Board for Quad T1/E1 Applications Developer Manual
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Evaluation Board for Quad T1/E1 Applications — LXD386
1.0
General Description
The LXD386 evaluation board is a versatile tool for engineers designing T1/E1 short haul
applications using the LXT386.
The evaluation board operates in one of two modes: Software (Host) mode or Hardware mode. In
Software mode, the device is controlled with the PC based configuration and monitoring software
through an i8051 microcontroller interface. In Hardware mode, the device and channel controls are
set using shorting blocks and DIP switches located on the LXD386 evaluation board.
The evaluation board provides banana jacks for each channel’s line interface to allow connection of
a T1/E1 pattern generator/analyzer. A connector is also provided for each channel’s framer or back-
end ASIC interface.
1.1
Features
• Software and Hardware controllable
• ZIF LQFP socket for easy swapping of LXT386
• Banana jacks for power and line interfaces
• 10-pin connectors for framer/ASIC interface
• 8-pin connector for IEEE 1149.1 compliant JTAG boundary scan port
• LED indicators for LOS alarm
• On-board 2.048/1.544 MHz reference clock oscillator
• Switches and shorting blocks for Hardware mode operation
• Compatible with Intel external i8051 microcontroller board
• PC-based software for ease of use
• Socketed transformer and termination components for easy experimentation
• Built-in overvoltage protection for line interface and power supply
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Evaluation Board for Quad T1/E1 Applications — LXD386
2.0
Overview
Caution: CMOS devices are static (ESD) sensitive. Take all industry standard precautions when handling the
evaluation board, LXT386 chip, and other sensitive electronic components.
Before proceeding with any evaluation board operations, review the specifications for the LXT386
transceiver.
2.1
LXD386 Packing List
The evaluation board kit contains the following components:
• LXD386 evaluation board with the LXT386 installed.
• 2.048 MHz oscillator installed, additional 1.544 MHz oscillator supplied.
• i8051 microcontroller interface board and PC serial port cable.
• PC compatible diskettes containing software for using the evaluation board in Software mode.
• Shorting block kit for selecting Hardware mode.
• LXD386 user guide.
• LXT386 data sheet.
2.2
Equipment Requirements
The evaluation board kit includes all the circuit components needed for a successful evaluation.
However, the following lab equipment is required:
• Power Supply +3.3V DC (+5VDC for TVCC optional)
• Telecom cable or cable simulator (optional).
• T1/E1 pattern generator/analyzer.
• 1.544/2.048 MHz clock source (optional).
• For Software mode: an IBM compatible PC with minimum 386 40 MHz processor, available
serial port, mouse, VGA monitor, DOS 5.0+, and Microsoft Windows 3.1 or later version,
Windows 9x is recommended.
2.3
Control Modes
The LXT386 has two basic operating modes: Hardware mode or Software (Host) mode. In
Hardware mode, operation of the LXT386 is established by hard-wiring the pins. In Software
mode, operation of the LXT386 is controlled by an external microprocessor that communicates
with the LXT386’s internal registers via either a serial or parallel interface.
The LXD386 evaluation board supports both hardware and software modes.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
2.4
Factory Settings
When shipped from the factory, the LXD386 evaluation board’s switches and jumpers are set for
software mode and parallel microprocessor interface.
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Evaluation Board for Quad T1/E1 Applications — LXD386
3.0
Hardware Mode Set-Up and Operation
3.1
Power Connections
The evaluation board has two power planes (VCC and TVCC) each of which is tied to a separate
red colored banana jack.
1. Connect the +3.3 VDC power supply to the VCC jack.
2. Connect either a +3.3 VDC or +5.0 VDC power supply to the TVCC jack.
3. Connect the power supply ground lead(s) to the black (GND) banana jack.
Jumper JP1 is provided to allow LXT386 current consumption measurements and must be installed
for normal board operation. Jumper JP3 allows measurement of the current in the TVCC power
supply only. It must also be installed for normal operation.
3.2
3.3
Hardware Mode Selection
To enable the Hardware mode of operation:
1. Set the MODE switch in switch block S1 to the LOW position.
2. Insert the two shorting blocks, provided with the evaluation board kit, into 20-pin sockets JP4
and JP6.
Loopback Mode Selection
The LXT386 LOOP/DLOOP signals are set by switches in switch block S1. Depending on the
LOOPn/DLOOPn combination selected for a particular channel, a different operation or loopback
Table 1. LOOP/DLOOP Switch Settings
LOOPn
DLOOPn
Channel #n Operation
Open
LOW
HIGH
HIGH
x
Normal Mode
x
Remote Loopback
LOW
HIGH
Analog Local Loopback
Digital Local Loopback
1. “x” means “don’t care”
3.4
Clock Edge Selection
The phase relation between RCLK and RPOS/RNEG is set by the CLKE switch in switch block
S4. Please refer to the “CLKE” signal pin in the LXT386 data sheet for details.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
3.5
3.6
Output Enable Selection
The OE switch in switch block S4 controls the operation of the LXT386 output drivers. For normal
operation (driver outputs enabled), set the OE switch to the ON position. Setting the OE switch to
OFF forces the output drivers to the high impedance state.
Code Selection
In Hardware mode, the MO-INT-CO switch in switch block S4 selects the line encode/decode. To
select AMI encode/decode set to the ON position. To select B8ZS/HDB3 encode/decode set to the
OFF position.
3.7
3.8
Monitoring Address Selection
Switch block S3 sets the Protected Monitoring Addresses A0 through A3. The factory default
setting is 0000 (no monitoring). See the LXT386 data sheet for details.
Jitter Attenuator Selection
In Hardware mode, the JASEL switch in switch block S1 selects the position of the Jitter
Attenuator in the data path:
• Transmit path = LOW
• Receive path = HIGH
• JA disabled = center
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Evaluation Board for Quad T1/E1 Applications — LXD386
Figure 2. Default Switch Settings
S3
CLKE
OE
MO-INT-CO
MUX
S4
A0
A1
A2
A3
S2
LEN2
LEN1
LEN0
S1
HIGH
LOW
LOOP0
LOOP1
LOOP2
NOTE:
OFF position = Low = ’0’
LOOP3
LOOP4
LOOP5
LOOP6
LOOP7
MODE
JASEL
3.9
Line Buildout Selection
Switch block S2 is used to select the transmit pulse shaping for T1 mode operation, as well as T1/
E1 mode selection. The factory default is 000 (E1 mode). Refer to the LXT386 data sheet for T1
pulse shape details.
3.10
Master Clock Setup
The on-board 2.048 MHz oscillator can be used for MCLK source. An additional 1.544 MHz
oscillator is included for use in T1 operation mode. A BNC connector (J1) is provided to allow use
of an external MCLK source. J1 is internally terminated into 50Ω. Jumper block JP5 is used to
Table 2. JP5 Jumper Settings
JP5 Setting
Operation
Data recovery mode
HIGH
EXT
INT
External MCLK source at BNC (J1)
Internal oscillator
LOW
Receiver power-down
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LXD386 — Evaluation Board for Quad T1/E1 Applications
Figure 3. Jumper Block JP5
3.11
JTAG Boundary Scan Port
JTAG boundary scan port for board testing purposes.
Figure 4. Jumper Block JP2
3.12
Framer/ASIC Connection
Ten pin connectors provide access to the digital signals necessary for interfacing with the back-end
connecting RCLK to TCLK.
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Evaluation Board for Quad T1/E1 Applications — LXD386
Figure 5. Jumper Block JP 31
3.13
LED Indicators
Loss of Signal (LOS) status for each channel is indicated by four LEDs, labeled D3 through D6. If
the board is being used in the Software mode, the state of these LEDs will also be displayed on the
registers display screen.
3.14
Line Interface
Access to the line interface is provided through the green and white banana jacks. The TIP signal
is routed to the white jacks for both transmit and receive directions. The RING signal is routed to
the green jacks for both directions.
An octal transformer is used for channels 1 to 3 (one transformer port is unused). Transformers in
channel 0 and line resistors /capacitors for channels 0 to 3 are socketed for easy swapping. Jumpers
JP7 to JP14 can be used to bypass the transmit series resistors for T1 applications with
TVCC=3.3V. See the LXT386 Data Sheet for details on transmit interface options.
3.15
Board Protection
The LXD386 evaluation board is equipped with both power supply and line surge protection. Two
Transient Voltage Suppressors (TVS) are included for power supply protection (5V/3.3V). For the
T1/E1 line interface, the transmitters are protected with Schottky diodes and the receivers are
protected by series 1KΩ input resistors. This protection is sufficient for G.703 Annex B
compliance.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
4.0
Software Mode Set-Up and Operation
4.1
i8051 Microcontroller Board
An i8051 microcontroller interface board is provided with the evaluation board kit. Connect the
i8051 microcontroller board to the evaluation board at the 96 pin header labeled CON1. Connect
the microcontroller board to an available serial (COM) port on your PC using the cable provided in
the evaluation board kit.
Instead of the i8051, a user supplied microcontroller board may also be used to control the
LXT386. Evaluation board connector CON1 provides access to all the relevant LXT386
microprocessor interface signals.
4.2
Evaluation Board Set-up
The evaluation board contains switches and jumpers to select various operating parameters. All
other parameters are controlled through the evaluation board software. When using the i8051
microcontroller provided with the kit, set the evaluation board switches and jumpers as follows:
1. Select software mode by removing the shorting blocks from sockets JP4 and JP6.
2. Set the MODE switch (in switch block S1) to select serial or parallel mode:
— HIGH for parallel mode (factory default)
— Center position for serial mode
3. Set the JASEL switch (in switch block S1) to the center position.
4. Set MO-INT-CO switch (in switch block S3) to HIGH (Intel microprocessor).
5. Set MUX switch (in switch block S3) to HIGH (Multiplexed microprocessor address/data
bus).
6. Set CLKE switch (in switch block S3). Refer to “CLKE” signal pin in LXT386 data sheet for
details.
4.3
4.4
Test Equipment Connections
The evaluation board contains connectors to interface an external pattern generator and other test
Power Connections
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Evaluation Board for Quad T1/E1 Applications — LXD386
4.5
4.6
Evaluation Board Software
When operating the evaluation board in the software mode, the software provided with the kit will
be used to configure the LXT386 and to monitor its operation. This software provides a point-and-
click, user friendly interface with on-line help screens. Refer to the data sheet for detailed
information about the LXT386 transceiver.
Software Installation and Start-Up
The minimum PC system requirements are:
• IBM compatible PC
• 386/40 MHz CPU (Pentium class recommended)
• Available serial port
• Mouse
• VGA monitor
• DOS version 5.0 or higher and Microsoft Windows 3.1 (Windows 9x recommended)
Begin the installation procedure by running the Setup.exe file on the installation diskette #1.
Follow the on-screen prompts to complete the software installation.
4.7
4.8
Hardware Set-up Screen
Whenever the LXT386 software is run, the Hardware Set-up screen will appear first on the monitor
(see Figure 6). This screen is used to select the PC serial port to be used. Select an available serial
port and click the OK button.
Quitting the Program
The program can be terminated at any time by clicking the “Exit” control button, located at the
right side of the screen.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
Figure 6. Hardware Set-up Screen
4.9
Configuration Screen
primary control interface with the evaluation board. A graphical representation of each channel is
shown in a tabbed display box, along with the control buttons described in the following
paragraphs.
4.9.1
Communications Modes
The option buttons located in the communications modes box are used to set the microprocessor
interface mode to parallel interface or serial interface.
Note: The selected communication mode must match the evaluation board MODE switch setting (see
4.9.2
4.9.3
Registers
Clicking the Registers control button will select the Registers screen, enabling read/write access to
Setting Individual Transceiver Operating Modes
Select the transceiver channel you wish to configure by clicking on the corresponding tab symbol.
Once a channel has been selected, set the operating mode by clicking on one of the three loopback
modes.
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Evaluation Board for Quad T1/E1 Applications — LXD386
4.9.4
4.9.5
Apply to all Channels
Clicking the “Apply to All Channels” control button will configure the other three channels to the
settings displayed for the currently selected channel.
Exit
The exit control button can be used at any time to close the software.
Figure 7. Configuration Screen
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LXD386 — Evaluation Board for Quad T1/E1 Applications
4.10
Registers Screen
4.10.1
Setting Registers
register is labeled by its functional name and hex address. Right click on a register name for on-line
help.
4.10.2
4.10.3
4.10.4
4.10.5
Status Indicators
Display boxes within the Registers screen show the state settings for individual bit positions of
each register. Each of the 4 least significant bits of these registers control the corresponding
transceiver channel, except where otherwise noted in the LXT386 specifications. The check boxes
beside the “Mode” column denote enabling of read/write step modes.
Control Buttons
Clicking on the “Read All” button will initiate a global read of all LXT386 registers. Clicking on
the “Read Step” and “Write Step” buttons performs the indicated action only on registers that have
the enable box checked. The “Back” button is used to return to the configuration screen, and the
“Exit” control button can be used at any time to close the software.
Interrupts
The Interrupt indicator is located in the lower right corner. This indicator will turn red whenever
there are pending interrupts in the LXT386. Interrupts are cleared by reading the corresponding
Status Monitor register. When all interrupts are cleared, the Interrupt indicator will turn Green. See
Reset
While operating the evaluation board in Software mode, reset is accomplished by using the write
step function to write to the software reset register address 0Ah.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
5.0
Evaluation Board Schematics
Figure 9. Evaluation Board Schematic — Data/Control
A N A C V C _
A N A N D G _
D I G N D G _
N D G I O
7 5
7 4
7
D I G C V C _
6
C V C I O
4
5
3
2
1
0
C V C _
C V C _
C V C _
C V C _
3
2
1
0
N D G _
N D G _
N D G _
N D G _
6 7
6 8
9
6 5
6 6
1 1
1 0
8
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Evaluation Board for Quad T1/E1 Applications — LXD386
Figure 10. Evaluation Board Schematic — Line Interface Unit
1
1
1
1
1
1
+
C V C T 3
C V C T 2
C V C T 1
C V C T 0
N D G T 3
N D G T 2
N D G T 1
N D G T 0
4 7
3 8
3 5
2 6
4 4
4 1
3 2
2 9
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