SMSC Switch USB2502 User Manual

USB2502

2-Port USB 2.0 Hub

Controller

Datasheet

PRODUCT FEATURES

„

Integrated USB 2.0 Compatible 2-Port Hub

„

On-Board 24MHz Crystal Driver Circuit or 24 MHz

external clock driver

—

High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and

Low-Speed (1.5Mbits/s) compatible

„

Internal PLL for 480MHz USB 2.0 Sampling

Internal 1.8V Linear Voltage Regulator

—

Full power management with ganged power control

Detects Bus-Power/Self-Power source and changes

mode automatically

Integrated USB termination and Pull-up/Pull-down

resistors

„

Complete USB Specification 2.0 Compatibility

—

Includes USB 2.0 Transceivers

„

Internal Short Circuit protection of USB differential

signal pins

VID/PID/DID, and Port Configuration for Hub via:

—

Single Serial I²C EEPROM

SMBus Slave Port

„

Basic single-color LED support

1.8 Volt Low Power Core Operation

3.3 Volt I/O with 5V Input Tolerance

„

Default VID/PID/DID, allows functionality when

configuration EEPROM is absent

36 Pin QFN or 48 Pin TQFP lead-free RoHS

compliant package

Hardware Strapping options allow for configuration

without an external EEPROM or SMBus Host

SMSC USB2502

DATASHEET

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2-Port USB 2.0 Hub Controller

Datasheet

Table of Contents

Chapter 1 General Descriptio n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1

OEM Selectable Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 2 Pin Table 2-Por t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 3 Pin Configuration 2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 4 2-Port Hub Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 5 Functional Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.1

2-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.1.1

5.1.2

Hub Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2

EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2.1

5.2.2

5.2.3

I2C EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

In-Circuit EEPROM Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

EEPROM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.3

SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Bus Reset Sequenc e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6

SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Internal SMBus Memory Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.4

5.5

5.6

Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.6.1

5.6.2

External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Chapter 6 XNOR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Chapter 7 DC Parameter s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 8

7.1

7.2

Maximum Guaranteed Rating s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 8

Chapter 8 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8.1

Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8.1.1

8.1.2

8.1.3

SMBus Interface: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Chapter 9 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

SMSC USB2502

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2-Port USB 2.0 Hub Controller

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List of Tables

Table 2.1 2-Port Pin Table for 36-QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 2.2 2-Port Pin Table for 48-TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 4.1 2-Port Hub Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 4.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4.3 Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4.4 Power, Ground, and No Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 4.5 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 5.1 User-Defined Descriptor Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 5.2 SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 5.3 SMBus Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 5.4 SMBus Slave Interface Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 5.5 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 5.6 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 5.7 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 7.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 9.1 48 Pin TQFP Packag e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4

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2-Port USB 2.0 Hub Controller

Datasheet

List of Figures

Figure 3.1 2-Port 36-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 3.2 2-Port 48-Pin TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 4.1 2-Port Block Diagra m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

Figure 5.1 LED Strapping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 5.2 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 5.3 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 5.4 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 9.1 36 Pin QFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 9.2 48 Pin TQFP Package Outline (7x7x1.4 mm body, 2mm Footprint) . . . . . . . . . . . . . . . . . . . 44

SMSC USB2502

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2-Port USB 2.0 Hub Controller

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Chapter 1 General Description

The SMSC 2-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host

as a Full-Speed Hub or as a Full-/High-Speed Hub. The 2-Port Hub supports Low-Speed, Full-Speed,

and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled

downstream ports.

The Hub works with an external USB power distribution switch device to control V

downstream ports, and to limit current and sense over-current conditions.

switching to

BUS

All required resistors on the USB ports are integrated into the Hub. This includes all series termination

resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+ and D– pins. The

over-current sense inputs for the downstream facing ports have internal pull-up resistors.

Throughout this document the upstream facing port of the hub will be referred to as the upstream port,

and the downstream facing ports will be called the downstream ports.

1.1

OEM Selectable Features

A default configuration is available in the USB2502 following a reset. This configuration may be

sufficient for some applications. Strapping option pins make it possible to modify a limited sub-set of

the configuration options.

The USB2502 may also be configured by an external EEPROM or a microcontroller. When using the

microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pin-strapped for

external EEPROM configuration but no external EEPROM is present, then a value of ‘0’ will be written

to all configuration data bit fields (the hub will attach to the host with all ‘0’ values).

The 2-Port Hub supports several OEM selectable features:

„

Operation as a Self-Powered USB Hub or as a Bus-Powered USB Hub.

Operation as a Dynamic-Powered Hub (Hub operates as a Bus-Powered device if a local power

source is not available and switches to Self-Powered operation when a local power source is

available).

„

Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from

an external SMBus Host.

„

Compound device support (port is permanently hardwired to a downstream USB peripheral device).

Hardware strapping options enable configuration of the following features.

Non-Removable Ports

Port Power Polarity (active high or active low logic)

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Chapter 2 Pin Table 2-Port

Table 2.1 2-Port Pin Table for 36-QFN

UPSTREAM USB 2.0 INTERFACE (3 PINS)

USBDN0 VBUS_DET

2-PORT USB 2.0 INTERFACE (10 PINS)

USBDP0

USBDP1

USBDN1

USBDP2

USBDN2

RBIAS

GR1/

NON_REM0

GR2/

NON_REM1

PRTPWR_POL

PRTPWR

OCS_N

SERIAL PORT INTERFACE (3 PINS)

SDA/SMBDATA

SCL/SMBCLK/

CFG_SEL0

CFG_SEL1

MISC (7 PINS)

XTAL1/CLKIN

XTAL2

RESET_N

TEST

SELF_PWR

ATEST/

CLKIN_EN

REG_EN

POWER, GROUND (13 PINS)

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Table 2.2 2-Port Pin Table for 48-TQFP

UPSTREAM USB 2.0 INTERFACE (3 PINS)

USBDP0

USBDP1

USBDN0

VBUS_DET

2-PORT USB 2.0 INTERFACE (10 PINS)

USBDN1

USBDP2

USBDN2

RBIAS

GR1/

GR2/

PRTPWR_POL

NON_REM0

NON_REM1

PRTPWR

OCS_N

SERIAL PORT INTERFACE (3 PINS)

SDA/SMBDATA

SCL/SMBCLK

CFG_SEL0

CFG_SEL1

MISC (7 PINS)

XTAL1/CLKIN

XTAL2

RESET_N

TEST

SELF_PWR

ATEST/

CLKIN_EN

REG_EN

POWER, GROUND AND NO CONNECT (25 PINS)

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Chapter 3 Pin Configuration 2-Port Hub

VDD33CR

VSS

VDD18

VSS

XTAL2

SELF_PWR

OCS_N

XTAL1/CLKIN

VDDA18PLL

VDDA33PLL

ATEST/REG_EN

RBIAS

SMSC

USB2502

(Top View QFN-36)

PRTPWR

PRTPWR_POL

GR2/NON_REM1

GR1/NON_REM0

VSS

Thermal Slug

(must be connected to VSS)

VSS

Indicates pins on the bottom of the device.

Figure 3.1 2-Port 36-Pin QFN

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Figure 3.2 2-Port 48-Pin TQFP

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Chapter 4 2-Port Hub Block Diagram

Upstream

USB Data

24 MHz

Crystal

To EEPROM or

SMBus Master

8SVWUHDP

V_BUS

SD SCK

3.3V

1.8V

PLL

Serial

Interface

Upstream

PHY

Bus-Power

'HWHFW

1.8V Reg

SIE

Controller

Repeater

Port

Controller

Transaction Translator

Routing Logic

OC Sense

Switch Driver

LED Driver

Downstream PHY #1

Downstream PHY #2

Strapping Options

Downstream

USB Data

Sense

Switch/LED

Driver/optís

Downstream

USB Data

Figure 4.1 2-Port Block Diagram

Table 4.1 2-Port Hub Pin Descriptions

TYPE FUNCTION

NAME

SYMBOL

UPSTREAM USB 2.0 INTERFACE

USB Bus Data

USBDN0

USBDP0

IO-U

I/O8

These pins connect to the upstream USB bus data signals.

Detect Upstream

VBUS Power

VBUS_DET

Detects state of Upstream VBUS power. The SMSC Hub

monitors VBUS_DET to determine when to assert the

internal D+ pull-up resistor (signalling a connect event).

When designing a detachable hub, this pin must be

connected to the VBUS power pin of the USB port that is

upstream of the hub. (Use of a weak pull-down resistor is

recommended.)

For self-powered applications with a permanently attached

host, this pin must be pulled-up to either 3.3V or 5.0V

(typically VDD33).

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Table 4.1 2-Port Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

2-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USBDN[2:1]

USBDP[2:1]

IO-U

These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

USB Power

Enable

PRTPWR

Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR pin is determined by

the Power Polarity Strapping function of the PRTPWR_POL

pin.

Port [2:1] Green

LED

GR[2:1]/

NON_REM[1:0]

I/O8

Green indicator LED for ports 2 and 1. Will be active low

when LED support is enabled via EEPROM or SMBus.

If the hub is configured by the internal default configuration,

these pins will be sampled at the rising edge of RESET_N

(see the applicable RESET_N timing table in Section 5.6.1)

to determine if ports [2:1] contain permanently attached

(non-removable) devices. Also, the active state of the LED’s

will be determined as follows:

Port Non-

Removable

strapping option.

NON_REM[1:0] = ‘00’, All ports are removable,

GR2 is active high,

GR1 is active high.

NON_REM1:0] = ‘01’, Port 1 is non-removable,

GR2 is active high,

GR1 is active low.

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,

GR2 is active low,

GR1 is active high.

NON_REM[1:0] = ‘11’, Ports 1 & 2 are non-removable,

GR2 is active low,

GR1 is active low.

Port Power

Polarity strapping.

PRTPWR_POL

I/O8

Port Power Polarity strapping determination for the active

signal polarity of the PRTPWR pin.

While RESET_N is asserted, the logic state of this pin will

(though the use of internal combinatorial logic) determine

the active state of the PRTPWR pin in order to ensure that

downstream port power is not inadvertently enabled to

inactive ports during a hardware reset.

On the rising edge of RESET_N (see the applicable

RESET_N timing table in Section 5.6.1), the logic value will

be latched internally, and will retain the active signal polarity

for the PRTPWR pin.

‘1’ = PRTPWR pin has an active ‘high’ polarity

‘0’ = PRTPWR pin has an active ‘low’ polarity

Over Current

Sense

OCS_N

RBIAS

IPU

I-R

Input from external current monitor indicating an over-

current condition. {Note: Contains internal pull-up to 3.3V

supply}

USB Transceiver

Bias

A 12.0kΩ (+/− 1%) resistor is attached from ground to this

pin to set the transceiver’s internal bias settings.

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Table 4.1 2-Port Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

SERIAL PORT INTERFACE

Serial Data/SMB

Data

SDA/SMBDATA

IOSD12

(Serial Data)/(SMB Data) signal.

Serial Clock/SMB

SCL/SMBCLK/

CFG_SEL0

(Serial Clock)/(SMB Clock) signal. This multifunction pin is

read on the rising edge of RESET_N (see the applicable

RESET_N timing table in Section 5.6.1) and will determine

the hub configuration method as described in T a ble 4.2.

Clock

Config Select 0

Configuration

Programming

Select

CFG_SEL1

This pin is read on the rising edge of RESET_N (see the

applicable RESET_N timing table in Section 5.6.1) and will

determine the hub configuration method as described in

T a ble 4.2.

Table 4.2 SMBus or EEPROM Interface Behavior

CFG_SEL1

CFG_SEL0

SMBus or EEPROM interface behavior.

Reserved

Configured as an SMBus slave for external download of user-

defined descriptors. SMBus slave address is 0101100

Internal Default Configuration via strapping options.

2-wire (I2C) EEPROMS are supported,

Table 4.3 Miscellaneous Pins

NAME

SYMBOL

TYPE

FUNCTION

Crystal

Input/External

Clock Input

XTAL1/

CLKIN

ICLKx

24MHz crystal or external clock input.

This pin connects to either one terminal of the crystal or

to an external 24MHz clock when a crystal is not used.

Crystal Output

XTAL2

OCLKx

24MHz Crystal

This is the other terminal of the crystal, or left

unconnected when an external clock source is used to

drive XTAL1/CLKIN. It must not be used to drive any

external circuitry other than the crystal circuit.

Clock Input

Enable

CLKIN_EN

Clock In Enable:

Low = XTAL1 and XTAL2 pins configured for use with

external crystal

High = XTAL1 pin configured as CLKIN, and must be

driven by an external CMOS clock.

RESET Input

RESET_N

This active low signal is used by the system to reset the

chip. The minimum active low pulse is 1us.

Self-Power /

Bus-Power

Detect

SELF_PWR

Detects availability of local self-power source.

Low = Self/local power source is NOT available (i.e., Hub

gets all power from Upstream USB VBus).

High = Self/local power source is available.

TEST Pin

TEST

IPD

Used for testing the chip. User must treat as a no-

connect or connect to ground.

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Table 4.3 Miscellaneous Pins (continued)

TYPE FUNCTION

NAME

SYMBOL

Analog Test

ATEST/

REG_EN

AIO

This signal is used for testing the analog section of the

chip, and to enable or disable the internal 1.8v regulator.

Internal 1.8V

voltage

regulator

enable

This pin must be connected to VDDA33 to enable the

internal 1.8V regulator, or to VSS to disable the internal

regulator.

When the internal regulator is enabled, the 1.8V power

pins must be left unconnected, except for the required

bypass capacitors.When the PHY is in test mode, the

internal regulator is disabled and the ATEST pin

functions as a test pin.

Table 4.4 Power, Ground, and No Connect

NAME

SYMBOL

TYPE

FUNCTION

VDDCORE3P3

VDD33CR

+3.3V I/O Power.

If the internal core 1.8V regulator is enabled, then this pin

acts as the regulator input

VDD1P8

VDD18

+1.8V core power.

If the internal regulator is enabled, then VDD18 pin 27

must have a 4.7μF (or greater) ±20% (ESR <0.1Ω)

capacitor to VSS

VDDAPLL3P3

VDDAPLL1P8

VDDA33PLL

VDDA18PLL

+3.3V Filtered analog power for the internal PLL

If the internal PLL 1.8V regulator is enabled, then this pin

acts as the regulator input

+1.8V Filtered analog power for internal PLL.

If the internal regulator is enabled, then this pin must

^{have a 4.7}μF (or greater) ±20% (ESR <0.1Ω) capacitor

to VSS

VDDA3P3

VSS

VDDA33

VSS

+3.3V Filtered analog power.

Ground.

Table 4.5 Buffer Type Descriptions

DESCRIPTION

BUFFER

Input.

IPD

IPU

Input, with a weak Internal pull-down.

Input, with a weak Internal pull-up.

Input with Schmitt trigger.

Input/Output 8mA

I/O8

Output 8mA

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Table 4.5 Buffer Type Descriptions (continued)

DESCRIPTION

BUFFER

IOSD12

Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1

requirements.

ICLKx

OCLKx

I-R

XTAL Clock Input

XTAL Clock Output

RBIAS

IO-U

Defined in USB Specification.

Note: Meets USB 1.1 requirements when operating as a 1.1-compliant device and meets USB

2.0 requirements when operating as a 2.0-compliant device.

AIO

Analog Input/output. Per PHY test requirements.

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Chapter 5 Functional Block Description

5.1

2-Port Hub

SMSC’s USB 2.0 2-Port Hub is fully specification compliant to the Universal Serial Bus Specification

Revision 2.0 April 27,2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 11 (Hub

Specification) for general details regarding Hub operation and functionality.

For performance reasons, the 2-Port Hub provides 1 Transaction Translator (TT) per port (defined as

Multi-TT configuration), divided into 4 non-periodic buffers per TT.

5.1.1

Hub Configuration Options

The SMSC Hub supports a large number of features and must be configured in order to correctly

function when attached to a USB host controller. There are three principal ways to configure the hub:

SMBus, EEPROM, or by internal default settings. In all cases, the configuration method will be

determined by the CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.

5.1.1.1

5.1.1.2

5.1.1.3

5.1.1.4

Vendor ID

Is a 16-bit value that uniquely identifies the Vendor of the user device (assigned by USB-Interface

Forum). This field is set by the OEM using either the SMBus or EEPROM interface options. When

using the internal default option, SMSC’s VID (see T a ble 5.1) will be reported.

Product ID

Is a 16-bit value that the Vendor can assign that uniquely identifies this particular product (assigned

by OEM). This field is set by the OEM using either the SMBus or EEPROM interface options. When

using the internal default option, SMSC’s PID designation of (see T a ble 5.1) will be reported.

Device ID

Is a 16-bit device release number in BCD format (assigned by OEM). This field is set by the OEM

using either the SMBus or EEPROM interface options. When using the internal default option, SMSC’s

DID designation of (see T a ble 5.1) will be reported.

Self-Powered/Bus-Powered

The Hub is either Self-Powered (draws less than 2mA of upstream bus power) or Bus-Powered

(limited to a 100mA maximum of upstream power prior to being configured by the host controller).

When configured as a Bus-Powered device, the SMSC Hub consumes less than 100mA of current

prior to being configured. After configuration, the Bus-Powered SMSC Hub (along with all associated

hub circuitry, any embedded devices if part of a compound device, and 100mA per externally available

downstream port) must consume no more than 500mA of upstream VBUS current. The current

consumption is system dependent, and the OEM must ensure that the USB 2.0 specifications are not

violated.

When configured as a Self-Powered device, <1mA of upstream VBUS current is consumed and all 7

ports are available, with each port being capable of sourcing 500mA of current.

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the

internal default option, the SELF_PWR pin determines the Self-powered or Bus-powered status.

Please see the description under Dynamic Power for the self/bus power functionality when dynamic

power switching is enabled.

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5.1.1.5

5.1.1.6

5.1.1.7

High-Speed Disable

Allows an OEM to force the Hub to configure as a Full-Speed device only (i.e. High-Speed not

available).

This field is set by the OEM using either the SMBus or EEPROM interface options.

EOP Disable

During FS operation only, this permits the Hub to send EOP if no downstream traffic is detected at

EOF1. See Section 11.3.1 of the USB 2.0 Specification for additional details.

This field is set by the OEM using either the SMBus or EEPROM interface options.

Current Sensing

Selects current sensing as all ports ganged, or none.

This field can be set by the OEM using either the SMBus or EEPROM interface options.When using

the internal default option, the SELF_PWR pin determines if current sensing will be ganged, or none

(ganged if self-powered, none if bus-powered)

5.1.1.8

Compound Device

Allows the OEM to indicate that the Hub is part of a compound (see the USB Specification for

definition) device. The applicable port(s) must also be defined as having a “Non-Removable Device”.

This field is set by the OEM using either the SMBus or EEPROM interface options.

Note: When configured via strapping options, declaring a port as non-removable automatically causes

the hub controller to report that it is part of a compound device.

5.1.1.9

Non-Removable Device

Informs the Host if one of the active ports has a permanent device that is undetachable from the Hub.

(Note: The device must provide its own descriptor data.)

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the

internal default option, the NON_REM[1:0] pins will designate the appropriate ports as being non-

removable.

5.1.1.10

5.1.1.11

Self-Powered Port DISABLE

During Self-Powered operation, this selects the ports which will be permanently disabled, and are not

available to be enabled or enumerated by a Host Controller. The disabled ports must be in decreasing

order starting with port 2.

This field is set by the OEM using either the SMBus or EEPROM interface options.

Bus-Powered Port DISABLE

During Bus-Powered operation, this selects the ports which will be permanently disabled, and are not

available to be enabled or enumerated by a Host Controller. The disabled ports must be in decreasing

order starting with port 2.

This field is set by the OEM using either the SMBus or EEPROM interface options.

5.1.1.12

Dynamic Power

Controls the ability of the 2-Port Hub to automatically change from Self-Powered operation to Bus-

Powered operation if the local power source is removed or is unavailable (and from Bus-Powered to

Self-Powered if the local power source is restored). {Note: If the local power source is available, the

2-port Hub will always switch to Self-Powered operation.}

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When Dynamic Power switching is enabled, the Hub detects the availability of a local power source

by monitoring the external SELF_PWR pin. If the Hub detects a change in power source availability,

the Hub immediately disconnects and removes power from all downstream devices and disconnects

the upstream port. The Hub will then re-attach to the upstream port as either a Bus-Powered Hub (if

local-power in unavailable) or a Self-Powered Hub (if local power is available).

This field is set by the OEM using either the SMBus or EEPROM interface options.

5.1.1.13

Over-Current Timer

The time delay (in 2ms increments) for an over-current condition to persist before it is reported to the

Host.

This field is set by the OEM using either the SMBus or EEPROM interface options.

5.1.1.14

5.1.1.15

5.1.1.16

Self-Powered Max Power

When in Self-Powered configuration, Sets value in 2mA increments.

This field is set by the OEM using either the SMBus or EEPROM interface options.

Bus-Powered Max Power

When in Bus-Powered configuration, Sets value in 2mA increments.

This field is set by the OEM using either the SMBus or EEPROM interface options.

Self-powered Hub Controller Current

When in Self-Powered configuration, Maximum current requirements of the Hub Controller in 2mA

increments.

This field is set by the OEM using either the SMBus or EEPROM interface options.

5.1.1.17

5.1.1.18

Bus-Powered Hub Controller Current

When in Bus-Powered configuration, Maximum current requirements of the Hub Controller in 2mA

increments.

This field is set by the OEM using either the SMBus or EEPROM interface options.

Power-On Timer

Time (in 2ms intervals) from the time power-on sequence begins on a port until power is good on that

port. System software uses this value to determine how long to wait before accessing a powered-on

port.

This field is set by the OEM using either the SMBus or EEPROM interface options.

5.1.1.19

Power Switching Polarity

The selection of active state “polarity” for the PRTPWR2 pin is made by a strapping option only.

5.1.2

VBus Detect

According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power

to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.

The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up

the D+ or D- resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not

Powered), Hub will remove power from the D+ or D- pull-up resistor within 10 seconds.

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5.2

EEPROM Interface

The SMSC Hub can be configured via a 2-wire (I2C) EEPROM. (Please see Table 4.1, "7-Port Hub

Pin Descriptions" for specific details on how to enable the I2C EEPROM option).

The Internal state-machine will, (when configured for EEPROM support) read the external EEPROM

for configuration data. The hub will then “attach” to the upstream USB host.

Please see T a ble 5.1 User-Defined Descriptor Data for a list of data fields available.

5.2.1

I2C EEPROM

The I2C EEPROM interface implements a subset of the I2C Master Specification (Please refer to the

Philips Semiconductor Standard I2C-Bus Specification for details on I2C bus protocols). The Hub’s I2C

EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it conforms to the

Standard-mode I2C Specification (100kbit/s transfer rate and 7-bit addressing) for protocol and

electrical compatibility.

Note: Extensions to the I2C Specification are not supported.

The Hub acts as the master and generates the serial clock SCL, controls the bus access (determines

which device acts as the transmitter and which device acts as the receiver), and generates the START

and STOP conditions.

5.2.1.1

5.2.1.2

Implementation Characteristics

Please refer to the MicroChip 24AA00 DataSheet for Protocol and Programming specifics.

Pull-Up Resistor

The Circuit board designer is required to place external pull-up resistors (10KΩ recommended) on the

SDA/SMBDATA & SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM

manufacturer guidelines) to Vcc in order to assure proper operation.

5.2.1.3

I2C EEPROM Slave Address

Slave address is 1010000.

Note: 10-bit addressing is NOT supported.

5.2.2

5.2.3

In-Circuit EEPROM Programming

The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s

EEPROM interface and allows an external source to program the EEPROM).

EEPROM DATA

Table 5.1 User-Defined Descriptor Data

DEFAULT

CFG

SELF

DEFAULT

CFG

BUS

(HEX)

BYTE

MSB:

LSB

SIZE

(BYTES)

FIELD

(HEX)

DESCRIPTION

VID

PID

1:0

3:2

0424

2502

0424

2502

Vendor ID (assigned by USB-IF).

Product ID (assigned by Manufacturer).

DID

5:4

0000

Device ID (assigned by Manufacturer).

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Table 5.1 User-Defined Descriptor Data (continued)

DEFAULT

CFG

SELF

DEFAULT

CFG

BUS

(HEX)

BYTE

MSB:

LSB

SIZE

(BYTES)

FIELD

(HEX)

DESCRIPTION

Config Data

Byte 1

Configuration data byte #1 for Hub options.

Configuration data byte #2 for Hub options.

Config Data

Byte 2

Non

Removable

Device

Defines the ports that contain attached

devices (this is used only when Hub is part of

a compound device).

Port Disable

Self-Powered

Selects the ports that will be permanently

disabled

Port Disable

Bus-Powered

Selects the ports that will be permanently

disabled

Max Power

Self-Powered

Max Current for this configuration (expressed

in 2mA units).

Max Power

Bus-Powered

Max Current for this configuration (expressed

in 2mA units).

Hub Controller

Max Current

Self-Powered

Max Current (expressed in 2mA units).

Time until power is stable.

Hub Controller

Max Current

Bus-Powered

Power-On

Time

5.2.3.1

EEPROM Offset 1:0(h) - Vendor ID

BIT

NUMBER

BIT NAME

DESCRIPTION

15:8

7:0

VID_MSB

VID_LSB

Most Significant Byte of the Vendor ID.

Least Significant Byte of the Vendor ID.

5.2.3.2

EEPROM Offset 3:2(h) - Product ID

BIT

NUMBER

BIT NAME

DESCRIPTION

15:8

7:0

PID_MSB

PID_LSB

Most Significant Byte of the Product ID.

Least Significant Byte of the Product ID.

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5.2.3.3

EEPROM Offset 5:4(h) - Device ID

BIT

NUMBER

BIT NAME

DESCRIPTION

15:8

7:0

DID_MSB

DID_LSB

Most Significant Byte of the Device ID.

Least Significant Byte of the Device ID.

5.2.3.4

EEPROM Offset 6(h) - CONFIG_BYTE_1

BIT

NUMBER

BIT NAME

DESCRIPTION

SELF_BUS_PWR

Self or Bus Power: Selects between Self- and Bus-Powered operation.

0 = Bus-Powered operation. (BUS Default)

1 = Self-Powered operation. (SELF Default)

Note: If Dynamic Power Switching is enabled, this bit is ignored and the

SELF_PWR pin is used to determine if the hub is operating from self or bus

power.

Reserved

HS_DISABLE

High Speed Disable: Disables the capability to attach as either a High/Full-

speed device, and forces attachment as Full-speed only i.e. (no High-Speed

support).

0 = High-/Full-Speed. (Default)

1 = Full-Speed-Only (High-Speed disabled!)

Reserved

EOP_DISABLE

EOP Disable: Disables EOP generation at EOF1 when no downstream

directed traffic is in progress.

0 = EOP generation at EOF1 is enabled.

1 = EOP generation at EOF1 is disabled, (normal operation). (Default)

2:1

CURRENT_SNS

Over Current Sense: Indicates whether current sensing is ganged.

00 = Ganged sensing (all ports together). (Default for self-power)

01 = Reserved

1x = Over current sensing not supported. (may be used with Bus-Powered

configurations only!, and is the default for bus-power)

Reserved

5.2.3.5

EEPROM Offset 7(h) - CONFIG_BYTE_2

BIT

NUMBER

BIT NAME

DESCRIPTION

DYNAMIC

Reserved

Dynamic Power Enable: Controls the ability for the Hub to transition to Bus-

Powered operation if the local power source is removed (can revert back to

Self-Power if local power source is restored).

0 = No Dynamic auto-switching.

1 = Dynamic Auto-switching capable.(Default)

Reserved

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BIT

NUMBER

BIT NAME

DESCRIPTION

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms

01 = 2ms (Default)

10 = 4ms

11 = 6ms

COMPOUND

Reserved

Compound Device: Designates if Hub is part of a compound device.

0 = No. (Default)

1 = Yes, Hub is part of a compound device.

2:0

Reserved.

5.2.3.6

EEPROM Offset 8(h) - Non-Removable Device

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

NR_DEVICE

Non-Removable Device: Indicates which port(s) include non-removable devic-

es. ‘0’ = port is removable, ‘1’ = port is non-removable.

Bit 7:3= 0; Reserved

Bit 2= 1; Port 2 non-removable.

Bit 1= 1; Port 1 non removable.

Bit 0 is Reserved, always = ‘0’.

5.2.3.7

EEPROM Offset 9(h) - Port Disable For Self Powered Operation

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_DIS_SP

Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port

is available, ‘1’ = port is disabled.

Bit 7:3= 0; Reserved

Bit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

5.2.3.8

EEPROM Offset A(h) - Port Disable For Bus Powered Operation

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_DIS_BP

Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port

is available, ‘1’ = port is disabled.

Bit 7:3= 0; Reserved

Bit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

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5.2.3.9

EEPROM Offset B(h) - Max Power For Self Powered Operation

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_SP

Max Power Self_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a self-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

Note: The USB 2.0 Specification does not permit this value to exceed

100mA

A value of 50 (decimal) indicates 100mA.

5.2.3.10

EEPROM Offset C(h) - Max Power For Bus Powered Operation

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

Max Power Bus_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a bus-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

A value of 50 (decimal) indicates 100mA.

5.2.3.11

EEPROM Offset D(h) - Hub Controller Max Current For Self Powered Operation

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a self-

powered hub. This value includes the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value does NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

Note: The USB 2.0 Specification does not permit this value to exceed

100mA

A value of 50 (decimal) indicates 100mA, which is the default value.

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5.2.3.12

EEPROM Offset E(h) - Hub Controller Max Current For Bus Powered Operation

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_BP

Hub Controller Max Current Bus-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a self-

powered hub. This value includes the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value does NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

A value of 50 (decimal) indicates 100mA, which is the default value.

5.2.3.13

EEPROM Offset F(h) - Power-On Time

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

POWER_ON_TIME

Power On Time: The length of time that is takes (in 2 ms intervals) from the

time the host initiated power-on sequence begins on a port until power is

good on that port.

5.3

SMBus Slave Interface

Instead of loading User-Defined Descriptor data from an external EEPROM, the SMSC Hub can be

configured to receive a code load from an external processor via an SMBus interface. The SMBus

interface shares the same pins as the EEPROM interface, if CFG_SEL1 & CFG_SEL0 activates the

SMBus interface, external EEPROM support is no longer available (and the user-defined descriptor

data must be downloaded via the SMBus). Due to system issues, the SMSC Hub waits indefinitely for

the SMBus code load to complete and only “appears” as a newly connected device on USB after the

code load is complete.

The Hub’s SMBus implementation is a subset of the SMBus interface to the host. The device is a

slave-only SMBus device. The implementation in the device is a subset of SMBus since it only supports

two protocols.

The Write Byte and Read Byte protocols are the only valid SMBus protocols for the Hub. The Hub

responds to other protocols as described in Section 5.3.2, "Invalid Protocol Response Behavior," on

page 25. Reference the System Management Bus Specification, Rev 1.0.

The SMBus interface is used to read and write the registers in the device. The register set is shown

in Section 5.3.9, "Internal SMBus Memory Register Set," on page 26.

5.3.1

Bus Protocols

Typical Write Byte and Read Byte protocols are shown below. Register accesses are performed using

7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The shading indicates

the Hub driving data on the SMBDATA line; otherwise, host data is on the SDA/SMBDATA line.

The slave address is the unique SMBus Interface Address for the Hub that identifies it on SMBus. The

the data that the host is attempting to write to the register or the contents of the register that the host

is attempting to read.

Note: Data bytes are transferred MSB first (msb first).

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5.3.1.1

Byte Protocols

When using the Hub SMBus Interface for byte transfers, a write will always consist of the SMBus

Interface Slave Address byte, followed by the Internal Address Register byte, then the data byte.

The normal read protocol consists of a write to the HUB with the SMBus Interface Address byte,

followed by the Internal Address Register byte. Then restart the Serial Communication with a Read

consisting of the SMBus Interface Address byte, followed by the data byte read from the Hub. This

can be accomplished by using the Read Byte protocol.

Note: For the following SMBus tables:

Denotes Master-to-Slave

Write Byte

Denotes Slave-to-Master

The Write Byte protocol is used to write data to the registers. The data will only be written if the protocol

shown in T a ble 5.2 is performed correctly. Only one byte is transferred at a time for a Write Byte

protocol.

Table 5.2 SMBus Write Byte Protocol

Field:

Bits:

Start

Slave Addr

Ack

Reg. Addr

Ack

Reg. Data

Ack

Stop

Read Byte

The Read Byte protocol is used to read data from the registers. The data will only be read if the

protocol shown in T a ble 5.3 is performed correctly. Only one byte is transferred at a time for a Read

Byte protocol.

Table 5.3 SMBus Read Byte Protocol

Field:

Bits:

Start

Slave

Addr

Ack

Reg.

Addr

Ack

Start

Slave

Addr

Ack

Reg.

Data

Nack

Stop

5.3.2

Invalid Protocol Response Behavior

Registers that are accessed with an invalid protocol are not updated. A register is only updated

following a valid protocol. The only valid protocols are Write Byte and Read Byte, which are described

above.

The Hub only responds to the hardware selected Slave Address.

Attempting to communicate with the Hub over SMBus with an invalid slave address or invalid protocol

results in no response, and the SMBus Slave Interface returns to the idle state.

The only valid registers that are accessible by the SMBus slave address are the registers defined in

the Registers Section. See Section 5.3.3 for the response to undefined registers.

5.3.3

General Call Address Response

The Hub does not respond to a general call address of 0000_000b.

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5.3.4

Slave Device Time-Out

According to the SMBus Specification, V1.0 devices in a transfer can abort the transfer in progress

and release the bus when any single clock low interval exceeds 25ms (T_{TIMEOUT, MIN}). Devices that

have detected this condition must reset their communication and be able to receive a new START

condition no later than 35ms (T_{TIMEOUT, MAX}).

Note: Some simple devices do not contain a clock low drive circuit; this simple kind of device typically

resets its communications port after a start or stop condition.

5.3.5

5.3.6

5.3.7

Stretching the SCLK Signal

The Hub supports stretching of the SCLK by other devices on the SMBus. The Hub does not stretch

the SCLK.

SMBus Timing

The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing

in the “Timing Diagram” section.

Bus Reset Sequence

The SMBus Slave Interface resets and returns to the idle state upon a START field followed

immediately by a STOP field.

5.3.8

5.3.9

SMBus Alert Response Address

The SMBALERT# signal is not supported by the Hub.

Internal SMBus Memory Register Set

The following table provides the SMBus slave interface register map values.

Table 5.4 SMBus Slave Interface Register Map

REG

ADDR

BIT 7

(MSB)

BIT 0

(LSB)

R/W

ABBR

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

00h

01h

02h

03h

04h

05h

06h

07h

08h

09h

R/W

Status/Command

VID LSB

STCD

VIDL

VID MSB

VIDM

PIDL

PID LSB

PID MSB

PIDM

DIDL

DIDM

CFG1

CFG2

NRD

DID LSB

DID MSB

Config Data Byte 1

Config Data Byte 2

Non-Removable

Devices

0Ah

0Bh

R/W

Port Disable (Self)

Port Disable (Bus)

PDS

PDB

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Table 5.4 SMBus Slave Interface Register Map (continued)

BIT 7

REG

ADDR

BIT 0

(LSB)

R/W

ABBR

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

0Ch

0Dh

0Eh

R/W

Max Power (Self)

Max Power (Bus)

MAXPS

MAXPB

HCMCS

Hub Controller

Max Current (Self)

0Fh

R/W

Hub Controller

HCMCB

PWRT

Max Current (bus)

10h

Power-on Time

5.3.9.1

BIT

NUMBER

BIT NAME

DESCRIPTION

7:3

Reserved

RESET

Reserved. {Note: Software must never write a ‘1’ to these bits}

Reset the SMBus Interface and internal memory back to RESET_N assertion

default settings. {Note: During this reset, this bit is automatically cleared to

its default value of 0.}

0 = Normal Run/Idle State.

1 = Force a reset.

WRITE_PROT

Write Protect: The external SMBus host sets this bit after the Hub’s internal

memory is loaded with configuration data. {Note: The External SMBus Host

is responsible for verification of downloaded data.}

0 = The internal memory (address range 01-10h) is not write protected.

1 = The internal memory (address range 01-10h) is “write-protected” to

prevent unintentional data corruption.}

{Note: This bit is write once and is only cleared by assertion of the external

RESET_N pin.}

USB_ATTACH

USB Attach & power-down the SMBus Interface.

0 = Default; SMBus slave interface is active.

1 = Hub will signal a USB attach event to an upstream device, Note: SMBus

Slave interface will completely power down after the ACK has completed.

{Note: This bit is write once and is only cleared by assertion of the external

RESET_N pin.}

5.3.9.2

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

VID_LSB

Least Significant Byte of the Vendor ID.

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5.3.9.3

BIT NAME

BIT

NUMBER

DESCRIPTION

7:0

VID_MSB

Most Significant Byte of the Vendor ID.

5.3.9.4

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PID_LSB

Least Significant Byte of the Product ID.

5.3.9.5

BIT

NUMBER

BIT NAME

DESCRIPTION

Most Significant Byte of the Product ID.

7:0

PID_MSB

5.3.9.6

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

DID_LSB

Least Significant Byte of the Device ID.

5.3.9.7

BIT

NUMBER

BIT NAME

7:0

DID_MSB

Most Significant Byte of the Device ID.

5.3.9.8

BIT

NUMBER

BIT NAME

SELF_BUS_PWR

Self or Bus Power: Selects between Self- and Bus-Powered operation.

0 = Bus-Powered operation.

1 = Self-Powered operation.

Note: If Dynamic Power Switching is enabled, this bit is ignored and the

SELF_PWR pin is used to determine if the hub is operating from self or bus

power.

Reserved

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BIT

NUMBER

BIT NAME

DESCRIPTION

HS_DISABLE

High Speed Disable: Disables the capability to attach as either a High/Full-

speed device, and forces attachment as Full-speed only i.e. (no High-Speed

support).

0 = High-/Full-Speed.

1 = Full-Speed-Only (High-Speed disabled!)

Reserved

EOP_DISABLE

EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.

0 = EOP generation is normal.

1 = EOP generation is disabled.

2:1

CURRENT_SNS

Over Current Sense: Indicates whether current sensing isganged.

00 = Ganged sensing (all ports together).

01 = Reserved1x = Over current sensing not supported. (must only be used

with Bus-Powered configurations!)

Reserved

5.3.9.9

BIT

NUMBER

BIT NAME

DESCRIPTION

DYNAMIC

Dynamic Power Enable: Controls the ability for the Hub to transition to Bus-

Powered operation if the local power source is removed (can revert back to

Self-Power if local power source is restored).

0 = No Dynamic auto-switching.

1 = Dynamic Auto-switching capable.

Reserved

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms

01 = 2ms

10 = 4ms

11 = 6ms

COMPOUND

Reserved

Compound Device: Designates if Hub is part of a compound device.

0 = No.

1 = Yes, Hub is part of a compound device.

2:0

Reserved

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5.3.9.10

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

NR_DEVICE

Non-Removable Device: Indicates which port(s) include non-removable devic-

es. ‘0’ = port is removable, ‘1’ = port is non-removable.

Bit 7:3: Reserved, always = ‘0’

Bit 2= 1; Port 2 non-removable.

Bit 1= 1; Port 1 non removable.

Bit 0 is Reserved, always = ‘0’.

5.3.9.11

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_DIS_SP

Port Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port

is available, ‘1’ = port is disabled.

Bit 7:3= 0; ReservedBit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

5.3.9.12

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PORT_DIS_BP

Port Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port

is available, ‘1’ = port is disabled.

Bit 7:3= 0; ReservedBit 2= 1; Port 2 is disabled.

Bit 1= 1; Port 1 is disabled.

Bit 0 is Reserved, always = ‘0’

5.3.9.13

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_SP

Max Power Self_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a self-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

Note: The USB 2.0 Specification does not permit this value to exceed

100mA

A value of 50 (decimal) indicates 100mA.

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5.3.9.14

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

MAX_PWR_BP

Max Power Bus_Powered: Value in 2mA increments that the Hub consumes

from an upstream port (VBUS) when operating as a bus-powered hub. This

value includes the hub silicon along with the combined power consumption

(from VBUS) of all associated circuitry on the board. This value also includes

the power consumption of a permanently attached peripheral if the hub is

configured as a compound device, and the embedded peripheral reports

0mA in its descriptors.

A value of 50 (decimal) indicates 100mA.

5.3.9.15

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_SP

Hub Controller Max Current Self-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a self-

powered hub. This value includes the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value does NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

Note: The USB 2.0 Specification does not permit this value to exceed

100mA

A value of 50 (decimal) indicates 100mA, which is the default value.

5.3.9.16

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

HC_MAX_C_BP

Hub Controller Max Current Bus-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a bus-

powered hub. This value will include the hub silicon along with the combined

power consumption (from VBUS) of all associated circuitry on the board.

This value will NOT include the power consumption of a permanently

attached peripheral if the hub is configured as a compound device.

A value of 50 (decimal) would indicate 100mA, which is the default value.

5.3.9.17

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

POWER_ON_TIME

Power On Time: The length of time that it takes (in 2 ms intervals) from the

time the host initiated power-on sequence begins on a port until power is

good on that port.

5.3.9.18

Undefined Registers

The registers shown in T a ble 5.4 are the defined registers in the Hub. Reads to undefined registers

return 00h. Writes to undefined registers have no effect and do not return an error.

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5.3.9.19

Reserved Registers

Unless otherwise instructed, only a ‘0’ may be written to all reserved registers or bits.

5.4

Default Configuration Option:

The SMSC Hub can be configured via its internal default configuration. (please see for specific details

on how to enable default configuration.

Please refer to T a ble 5.1 on page 19 for the internal default values that are loaded when this option is

selected.

5.5

Default Strapping Options:

The SMSC Hub can be configured via a combination of internal default values and pin strap options.

Please see Table 4.1, "7-Port Hub Pin Descriptions" for specific details on how to enable the

default/pin-strap configuration option.

The strapping option pins only cover a limited sub-set of the configuration options. The internal default

values will be used for the bits & registers that are not controlled by a strapping option pin. Please

refer to T a ble 5.1 on page 19 for the internal default values that are loaded when this option is selected.

The Green LED pins are sampled after RESET_N negation, and the logic values are used to configure

the hub if the internal default configuration mode is selected. The implementation shown below (see

Figure 5.1) shows a recommended passive scheme. When a pin is configured with a “Strap High”

configuration, the LED functions with active low signalling, and the PAD will “sink” the current from the

external supply. When a pin is configured with a “Strap Low” configuration, the LED functions with

active high signalling, and the PAD will “source” the current to the external LED.

Strap High

50K

GR1

HUB

GR2

Strap Low

50K

Figure 5.1 LED Strapping Option

5.6

Reset

There are two different resets that the Hub experiences. One is a hardware reset (via the RESET_N

pin) and the second is a USB Bus Reset.

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5.6.1

External Hardware RESET_N

A valid hardware reset is defined as, assertion of RESET_N for a minimum of 1us after all power

supplies are within operating range. While reset is asserted, the Hub (and its associated external

circuitry) consumes less than 500μA of current from the upstream USB power source (300μA for the

Hub and 200μA for the external circuitry).

Assertion of RESET_N (external pin) causes the following:

1. All downstream ports are disabled, and PRTPWR power to downstream devices is removed.

2. The PHYs are disabled, and the differential pairs will be in a high-impedance state.

3. All transactions immediately terminate; no states are saved.

4. All internal registers return to the default state (in most cases, 00(h)).

5. The external crystal oscillator is halted.

6. The PLL is halted.

7. LED indicators are disabled.

The Hub is “operational” 500μs after RESET_N is negated.

Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the

SMBus option is not disabled).

5.6.1.1

RESET_N for Strapping Option Configuration

Drive Strap

Outputs to

inactive

Start

completion

request

Hardware

reset

asserted

Attach

USB

Upstream

Read Strap

Options

USB Reset

recovery

Idle

levels

response

RESET_N

VSS

Strap Pins

VSS

Don’t Care

Valid

Driven by Hub if strap is an output.

Don’t Care

Figure 5.2 Reset_N Timing for Default/Strap Option Mode

Table 5.5 Reset_N Timing for Default/Strap Option Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

nsec

μsec

msec

Strap Setup Time

16.7

Strap Hold Time.

1400

1.5

hub outputs driven to inactive logic states

USB Attach (See Note).

2.0

100

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Table 5.5 Reset_N Timing for Default/Strap Option Mode (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

Host acknowledges attach and signals USB

Reset.

100

msec

USB Idle.

undefined

msec

Completion time for requests (with or without data

stage).

Notes:

„

When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than

100mA from the upstream USB power source during t1+t5.

„

All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC

Parameters", prior to (or coincident with) the assertion of RESET_N.

5.6.1.2

RESET_N for EEPROM Configuration

Start

completion

request

Hardware

Read EEPROM

Set Options

Attach

USB

Upstream

Read Strap

Options

USB Reset

recovery

reset

asserted

Idle

response

RESET_N

VSS

Figure 5.3 Reset_N Timing for EEPROM Mode

Table 5.6 Reset_N Timing for EEPROM Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

msec

Hub Recovery/Stabilization.

EEPROM Read / Hub Config.

USB Attach (See Note).

500

99.5

100

2.0

Host acknowledges attach and signals USB

Reset.

100

USB Idle.

undefined

msec

Completion time for requests (with or without data

stage).

Notes:

„

When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than

100mA from the upstream USB power source during t4+t5+t6+t7.

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„

All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC

Parameters", prior to (or coincident with) the assertion of RESET_N.

5.6.1.3

RESET_N for SMBus Slave Configuration

Start

completion

request

Hardware

Attach

USB

Upstream

Reset

SMBus Code

Load

Hub PHY

USB Reset

recovery

reset

asserted

Idle

Negation

Stabilization

response

RESET_N

VSS

Figure 5.4 Reset_N Timing for SMBus Mode

Table 5.7 Reset_N Timing for SMBus Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

msec

Hub Recovery/Stabilization.

SMBus Code Load (See Note).

Hub Configuration and USB Attach.

500

99.5

100

Host acknowledges attach and signals USB

Reset.

100

USB Idle.

Undefined

msec

Completion time for requests (with or without data

stage).

Notes:

„

For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated

circuitry must not consume more than 100mA from the upstream USB power source during

t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load

the configuration is determined by the external SMBus host.

„

All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC

Parameters", prior to (or coincident with) the assertion of RESET_N.

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5.6.2

USB Bus Reset

In response to the upstream port signaling a reset to the Hub, the Hub does the following:

Note: The Hub does not propagate the upstream USB reset to downstream devices.

1. Sets default address to 0.

2. Sets configuration to: Unconfigured.

3. Negates PRTPWR to all downstream ports.

4. Clears all TT buffers.

5. Moves device from suspended to active (if suspended).

6. Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset

sequence.

The Host then configures the Hub and the Hub’s downstream port devices in accordance with the USB

Specification.

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Chapter 6 XNOR Test

XNOR continuity tests all signal pins on the Hub (every pin except for NC, XTAL1/CLKIN, XTAL2,

ATEST/REG_EN, RBIAS, TEST, Power, and Ground). This functionality is enabled by driving TEST

and CFG_SEL[1] high, driving SCLK low and transition RESET_N from low to high. The output from

the XNOR chain is driven to GR2 . For each pin tested for continuity GR2 should toggle.

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Chapter 7 DC Parameters

7.1

Maximum Guaranteed Ratings

PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Storage

Temperature

T_A

-55

150

°C

Lead

325

2.5

°C

Soldering < 10 seconds

Temperature

1.8V supply

voltage

V_DDA18PLL

V_DD18

-0.3

3.3V supply

voltage

V_DDA33

V_DDA33PLL

4.0

V_DD33CR

Voltage on any

I/O pin

-0.3

(3.3V supply voltage + 2) ≤ 6

Voltage on

XTAL1

4.0

Voltage on

XTAL2

V_DD18+ 0.3V

Note: Stresses above the specified parameters could cause permanent damage to the device. This

is a stress rating only and functional operation of the device at any condition above those

indicated in the operation sections of this specification is not implied. When powering this

device from laboratory or system power supplies, it is important that the Absolute Maximum

Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage

spikes on their outputs when the AC power is switched on or off. In addition, voltage transients

on the AC power line may appear on the DC output. When this possibility exists, it is suggested

that a clamp circuit be used.

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7.2

Recommended Operating Conditions

PARAMETER

SYMBOL

MIN

MAX

UNITS

COMMENTS

Operating

Temperature

T_A

°C

1.8V supply voltage

V_DDA18PLL

V_DD18

1.62

3.0

1.98

3.6

3.3V supply voltage

V_DDA33

V_DDA33PLL

V_DD33CR

Voltage on any I/O pin

-0.3

5.5

If any 3.3V supply voltage drops

below 3.0V, then the MAX

becomes:

(3.3V supply voltage + 0.5)

Voltage on XTAL1

Voltage on XTAL2

-0.3

V_DDA33

V_DD18

Table 7.1 DC Electrical Characteristics

PARAMETER

I, IS Type Input Buffer

Low Input Level

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

V_ILI

V_IHI

I_IL

0.8

TTL Levels

2.0

-10

250

High Input Level

+10

350

Input Leakage

V_IN= 0 to V_DD33CR

V_HYSI

300

Hysteresis (‘IS’ Only)

Input Buffer with Pull-Up

(IPU)

V_ILI

V_IHI

I_ILL

0.8

Low Input Level

TTL Levels

2.0

High Input Level

Low Input Leakage

High Input Leakage

+45

+10

V_IN= 0

I_IHL

-10

V_IN= V_DD33CR

Input Buffer with Pull-Down

IPD

V_ILI

V_IHI

I_ILL

0.8

Low Input Level

TTL Levels

2.0

+10

-80

High Input Level

Low Input Leakage

High Input Leakage

-10

V_IN= 0

I_IHL

-160

V_IN= V_DD33CR

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Table 7.1 DC Electrical Characteristics (continued)

PARAMETER

ICLK Input Buffer

Low Input Level

High Input Level

Input Leakage

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

V_ILCK

V_IHCK

I_IL

0.8

TTL Levels

2.0

-10

+10

100

V_IN= 0 to V_DD33CR

V_HYSC

Hysteresis

O8 and I/O8 Type Buffer

Low Output Level

High Output Level

Output Leakage

V_OL

V_OH

I_OL

0.4

_OL= 8 mA @ V_DD33CR = 3.3V

_OH= -4mA @ V_DD33CR = 3.3V

2.4

-10

+10

V_IN= 0 to V_DD33CR

(Note 1)

I/OSD12 Type Buffer

Low Output Level

Output Leakage

Hysteresis

V_OL

I_OL

0.4

+10

350

I_OL= 12 mA @ V_DD33CR = 3.3V

-10

µA

V_IN= 0 to V_DD33CR

(Note 1)

V_HYSI

250

300

IO-U

(Note 2)

I-R

(Note 3)

Supply Current Unconfig-

ured

I_CCINIT

High-Speed Host

Full-Speed Host

Supply Current

Configured

Total from all supplies

(High-Speed Host)

I_HCC2

I_HCH2

I_HCH1C1

120

170

140

2 Ports @ FS/LS

2 Ports @ HS

1 Port HS, 1 Port FS/LS

Supply Current

Configured

Total from all supplies

(Full-Speed Host)

1 Port

2 Ports

I_FCC1

I_FCC2

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Table 7.1 DC Electrical Characteristics (continued)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

COMMENTS

Supply Current

Suspend

I_CSBY

320

425

Total from all supplies.

Supply Current

Reset

I_RST

160

300

Total from all supplies.

Notes:

1. Output leakage is measured with the current pins in high impedance.

2. See USB 2.0 Specification for USB DC electrical characteristics.

3. RBIAS is a 3.3V tolerant analog pin.

CAPACITANCE T = 25°C; fc = 1MHz; V_DD33CR= 3.3V

LIMITS

PARAMETER

SYMBOL

MIN

TYP MAX UNIT

TEST CONDITION

Clock Input

Capacitance

C_IN

All pins except USB pins (and pins under

test tied to AC ground)

Input Capacitance

Output Capacitance

C_IN

C_OUT

Power Sequencing

There are no power supply sequence restrictions for the Hub. The order in which power supplies

power-up and power-down is implementation dependent.

SMSC USB2502

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2-Port USB 2.0 Hub Controller

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Chapter 8 AC Specifications

8.1

Oscillator/Clock

Crystal: Parallel Resonant, Fundamental Mode, 24 MHz ±100ppm.

External Clock: 50% Duty cycle ± 10%, 24 MHz ± 100ppm, Jitter < 100ps rms.

8.1.1

SMBus Interface:

The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set

forth in the SMBus 1.0 Specification for Slave-Only devices (except as noted in Section 5.3).

8.1.2

8.1.3

I2C EEPROM:

Frequency is fixed at 59KHz ± 20%.

USB 2.0

The Hub conforms to all voltage, power, and timing characteristics and specifications as set forth in

the USB 2.0 Specification. Please refer to the USB Specification for more information.

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Chapter 9 Package Outlines

REVISION HISTORY

DESCRIPTION

REVISION

DATE

RELEASED BY

SEE SPEC FRONT PAGE FOR REVISION HISTORY

TERMINAL #1

IDENTIFIER AREA

(D/2 X E/2)

TERMINAL #1

IDENTIFIER AREA

(D1/2 X E1/2)

EXPOSED PAD

0.6(MAX)

36X L

0.6(MAX)

36X 0.2 MIN

36X b

CHAMFERED CORNERS

ARE OPTIONAL 4X

TOP VIEW

4X 0°-12°

BOTTOM VIEW

ccc

SIDE VIEW

D2 / E2 VARIATIONS

CATALOG PART

THIRD ANGLE PROJECTION

UNLESS OTHERWISE SPECIFIED

DIMENSIONS ARE IN MILLIMETERS

AND TOLERANCES ARE:

3-D VIEWS

80 ARKAY DRIVE

HAUPPAUGE, NY 11788

USA

DECIMAL

X.X ±0.1

ANGULAR

±1°

X.XX ±0.05

X.XXX ±0.025

NOTES:

1. ALL DIMENSIONS ARE IN MILLIMETER.

2. POSITION TOLERANCE OF EACH TERMINAL IS ± 0.05mm AT MAXIMUM MATERIAL CONDITION. DIMENSIONS

"b" APPLIES TO PLATED TERMINALS AND IT IS MEASURED BETWEEN 0.15 AND 0.30 mm FROM THE

TERMINAL TIP.

TITLE

NAME

DATE

DIM AND TOL PER ASME Y14.5M - 1994

MATERIAL

PACKAGE OUTLINE

36 TERMINAL QFN, 6x6mm BODY, 0.5mm PITCH

DRAWN

S.K.ILIEV

12/6/04

REV

FINISH

CHECKED

DWG NUMBER

S.K.ILIEV

MO-36-QFN-6x6

3. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL BUT MUST BE LOCATED WITHIN THE AREA INDICATED.

4. COPLANARITY ZONE APPLIES TO EXPOSED PAD AND TERMINALS.

APPROVED

SCALE

STD COMPLIANCE

SHEET

PRINT WITH "SCALE TO FIT"

DO NOT SCALE DRAWING

S.K.ILIEV

1:1

JEDEC: MO-220

1 OF 1

Figure 9.1 36 Pin QFN Package

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2-Port USB 2.0 Hub Controller

Datasheet

Figure 9.2 48 Pin TQFP Package Outline (7x7x1.4 mm body, 2mm Footprint)

Table 9.1 48 Pin TQFP Package

MAX

MIN

NOMINAL

REMARKS

1.60

0.15

1.45

9.20

7.10

9.20

7.10

0.20

0.75

Overall Package Height

Standoff

0.05

1.35

8.80

6.90

8.80

6.90

0.09

0.45

Body Thickness

X Span

X body Size

Y Span

Y body Size

Lead Frame Thickness

Lead Foot Length

Lead Length

0.60

1.00

0.50 Basic

Lead Pitch

0^o

0.17

0.08

0.22

7^o

0.27

Lead Foot Angle

Lead Width

ccc

Lead Shoulder Radius

Lead Foot Radius

Coplanarity

0.20

0.08

Notes:

1. Controlling Unit: millimeter.

2. Tolerance on the true position of the leads is ± 0.04 mm maximum.

3. Package body dimensions D1 and E1 do not include the mold protrusion.

Maximum mold protrusion is 0.25 mm.

4. Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane.

5. Details of pin 1 identifier are optional but must be located within the zone indicated.

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