SMSC USB2504, USB2504A User Manual

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USB2504/ USB2504A

Integrated USB 2.0 Compatible 4-Port Hub

PRODUCT FEATURES

 Integra ted USB 2.0 Compatible 4-Port Hub

— 4 Transaction Translators for highest performance — High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and

Low-Speed (1.5Mbits/s) compatible

— Full power management with per port or ganged

selectable power control

— Detects Bus-Power/Self-Power source and changes

mode automatically

 Co mplete USB Specification 2.0 Compatibility

— Includes USB 2.0 Transceivers

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

— Single Serial I2C EEPROM — SMBus Slave Port

 De fault VID/PID/DID, allows functionality when

configuration EEPROM is absent

 Ha rdware Strapping options allow for configuration

without an external EEPROM or SMBus Host

Datasheet

 On-Boa rd 24MHz Crystal Driver Circuit or 24 MHz

external clock driver

 Interna l PLL for 480MHz USB 2.0 Sampling  Interna l 1.8V Linear Voltage Regulator  Integ rated USB termination and Pull-up/Pull-down

resistors

 Interna l Short Circuit protection of USB differential

signal pins

 1 .8 Volt Low Power Core Operation  3 .3 Volt I/O with 5V Input Tolerance  6 4-Pin TQFP lead-free RoHS compliant package

SMSC USB2504/USB2504A DATASHEET Revision 2.3 (08-27-07)

Integrated USB 2.0 Compatible 4-Port Hub

ORDER NUMBERS:

USB2504/USB2504A-JT FOR 64 PIN TQFP LEAD-FREE ROHS COMPLIANT PACKAGE

Datasheet

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123

Copyright © 2007 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a mean s of illustrating typical applications. Conse quently, complete information sufficient for

construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently da ted version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Revision 2.3 (08-27-07) 2 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Table of Contents

Chapter 1 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1 OEM Selectable Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 2 Pin Table 4-Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 3 Pin Configuration 4-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 4 4-Port Hub Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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

5.1 4-Port Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

5.1.2 VBus Detect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

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

5.2.2 In-Circuit EEPROM Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.2.3 EEPROM DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3 SMBus Slave Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3.1 Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.3.2 Invalid Protocol Response Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.3.3 General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.3.4 Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.5 Stretching the SCLK Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.6 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.7 Bus Reset Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.8 SMBus Alert Response Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.9 Internal SMBus Memory Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.4 Default Configuration Option: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.5 Default Strapping Options: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.6 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.6.1 External Hardware RESET_N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.6.2 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Chapter 6 Backward Compatibility to the USB20H04. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.1 Internal 1.8V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.2 Configuration by Internal Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.3 Configuration by SMBus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.4 PRTPWR_POL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Chapter 7 XNOR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Chapter 8 DC Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.1 Maximum Guaranteed Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.2 Recommended Operating Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Chapter 9 AC Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1 Oscillator/Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1.1 SMBus Interface:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1.2 I2C EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

9.1.3 USB 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

SMSC USB2504/USB2504A 3 Revision 2.3 (08-27-07)

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Chapter 10 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Revision 2.3 (08-27-07) 4 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

List of Figures

Figure 3.1 4-Port 64 Pin TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4.1 4-Port Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 5.1 LED Strapping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 5.2 Reset_N Timing for Default/Strap Option Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 5.3 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 5.4 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 10.1 64 Pin TQFP Package Outline (10x10x1.4 mm body - 2 mm footprint). . . . . . . . . . . . . . . . . 46

SMSC USB2504/USB2504A 5 Revision 2.3 (08-27-07)

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

List of Tables

Table 2.1 4-Port Pin Table for 64-TQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 4.1 4-Port Hub Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 5.1 User-Defined Descriptor Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 5.2 SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 5.3 SMBus Read Byte Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 5.4 SMBus Slave Interface Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 5.5 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 5.6 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 5.7 Reset_N Timing for SMBus Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 8.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 10.1 64 Pin TQFP Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Revision 2.3 (08-27-07) 6 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Chapter 1 General Description

The SMSC 4-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 4-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.

A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture ensures maximum USB throughput for each connected device when operating with mixed-speed peripherals.

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.

All required resistors on the USB ports are integrated into the Hub. This includes all seri es termination resistors on D+ and D– pins and all require d 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 USB2504/USB2504A following a reset. This configuration may be sufficient for some applications. Strapping option pins make it possible to modify a limited subset of the configuration options.

The USB2504/USB2504A may also be configured by an external EEPROM o r a microcontroller. When using the microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pinstrapped 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 4-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 operate s as a Bus-Powered device if a local power

source is not available and switches to Self-Powered opera tion when a local power source is available).

 Multiple Transaction Translator (Multi-TT) or Single-TT support.  Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from

an external SMBus Host.

 Port power switching on an individual or ganged basis.  Port over-current monitoring on an individual or ganged basis.  LED indicator support.  Compound device support (port is permanently hardwired to a down strea m USB perip heral device).  Hardware strapping options enable configuration of the following feature s.

Non-Removable Ports Port Power Polarity (active high or active low logic) Port Disable LED support MTT enable Ganged Vs Port power switching and over-current sensing

switching to

BUS

SMSC USB2504/USB2504A 7 Revision 2.3 (08-27-07)

DATASHEET

Chapter 2 Pin Table 4-Port

Table 2. 1 4-Port Pin Table for 64-TQF P

UPSTREAM USB 2.0 INTERFACE (3 PINS)

USBDP0 USBDN0 VBUS_DET

4-PORT USB 2.0 INTERFACE (26 PINS)

USBDP1 USBDN1 USBDP2 USBDN2 USBDP3 USBDN3 USBDP4 USBDN4

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

GR1/

NON_REM0

AM1/

GANG_EN PRTPWR1 PRTPWR2 PRTPWR3 PRTPWR4

OCS1_N OCS2_N OCS3_N OCS4_N

PRTPWR_POL RBIAS

SDA/SMBDATA SCL/SMBCLK/ CFG_SEL2 CFG_SEL1

CFG_SEL0

XTAL1/CLKIN XTAL2 RESET_N SELF_PWR

ATEST/

REG_EN

POWER, GROUND (17 PINS) AND (5) NO CONNECT

GR2/

NON_REM1

AM2/

MTT_EN

SERIAL PORT INTERFACE (5 PINS)

MISC (8 PINS)

CLKIN_EN TEST1 TEST0

GR3/

PRT_DIS0

AM3 AM4/

GR4/

PRT_DIS1

LED_EN

Revision 2.3 (08-27-07) 8 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Chapter 3 Pin Configuration 4-Port Hub

RESET_N

CFG_SEL1

SELF_PWR

VBUS_DET

VSS

VDD18

VSS

XTAL2

XTAL1/CLKIN

CFG_SEL2 VDDA18PLL VDDA33PLL

ATEST/REG_EN

RBIAS

VSS

TEST1

CLKIN_EN

PRTPWR2

OCS2_N

OCS1_N

PRTPWR1

USB2504 & USB2504A

OCS3_N

VDD18

VSS

PRTPWR4

PRTPWR3

CFG_SEL0

OCS4_N

SCL/SMBCLK

SDA/SMBDATA

NC TEST0 VDD18

VSS

VDD33

GR1/NON_REM0

AM1/GANG_EN GR2/NON_REM1

AM2/MTT_EN

PRTPWR_POL

GR3/PRT_DIS0 AM3 GR4/PRT_DIS1

AM4/LED_EN

NC NC

VDDA33

USBDP0

VSS

USBDN0

USBDP1

USBDN1

VDDA33

USBDP2

USBDN2

VSS

USBDP3

USBDN3

VDDA33

USBDP4

USBDN4

VSS

Figure 3.1 4-Port 64 Pi n TQFP

SMSC USB2504/USB2504A 9 Revision 2.3 (08-27-07)

DATASHEET

Chapter 4 4-Port Hub Block Diagram

Upstream USB Data

Upstream

BUS

24 MHz

Crystal

3.3V

1.8V Cap

Strapping

Options

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

To EEPROM or SMBus

Master

SCLSD

Upstream

PHY

Repeater

Downstream

PHY #1

Downstream

USB DataOCSense

Power

Detect

Internal

Defaults

Select

BUS

Switch Driver

LED Drivers

PLL

Routing Logic

Port #1

OC Sense

Switch/LED

Drivers

1.8V Reg.

SIE

TT#1TT#2TT#3TT

Downstream

...

PHY #4

Downstream

USB DataOCSense

Figure 4.1 4-Port Block Diagram

Serial

Interface

Controller

Port

Controller

Port #4

OC Sense

Switch Driver

LED Drivers

Switch/LED

Drivers

Ta ble 4.1 4-Port Hub Pin Descriptions

NAME SYMBOL TYPE FUNCTION

UPSTREAM USB 2.0 INTERFACE

USB Bus Data USBDN0

IO-U These pins connect to the upstream USB bus data signals.

USBDP0

Detect Upstream

VBUS Power

VBUS_DET I/O12 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).

Revision 2.3 (08-27-07) 10 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Table 4.1 4-Port Hub Pin Descriptions (continued)

NAME SYMBOL TYPE FUNCTION

4-PORT USB 2.0 HUB INTERFACE

High-Speed USB

Data

USB Power

Enable

Port 4:3 Green

LED

Port Disable

strapping option.

USBDN[4:1] USBDP[4:1]

IO-U These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

PRTPWR[4:1] O12 Enables power to USB peripheral devices (downstream).

The active signal level of the PRTPWR[4:1] pins is determined by the Power Polarity Strapping function of the PRTPWR_POL pin.

GR[4:3]/

PRT_DIS[1:0]

I/O12 Green indicator LED for ports 4 and 3. 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 RESET_N negation to determine if ports [4:2] will be permanently disabled. Also, the active state of the LED’s will be determined as follows:

PRT_DIS[1:0] = ‘00’, All ports are enabled, GR4 is active high, GR3 is active high.

PRT_DIS[1:0] = ‘01’, Port 4 is disabled, GR4 is active high, GR3 is active low.

PRT_DIS[1:0] = ‘10’, Ports 4 & 3 are disabled, GR4 is active low, GR3 is active high.

PRT_DIS[1:0] = ‘11’, Ports 4, 3 & 2 are disabled, GR4 is active low, GR3 is active low.

Port [2:1] Green

LED

Port Non-

Removable

strapping option.

GR[2:1]/

NON_REM[1:0]

I/O12 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 RESET_N negation to determine if ports [3:1] contain permanently attached (nonremovable) devices. Also, the active state of the LED’s will be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable, GR2 is active high, GR1 is active high.

NON_REM[1:0] = ‘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, & 3 are non-removable, GR2 is active low, GR1 is active low.

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Integrated USB 2.0 Compatible 4-Port Hub

Table 4.1 4-Port Hub Pin Descriptions (continued)

NAME SYMBOL TYPE FUNCTION

Datasheet

Port 4 Amber

LED

LED Enable

strapping option

Port 3 Amber

LED

Port 2 Amber

LED

MTT Disable

Port 1 Amber

LED

Gang Power

Switching and

Current Sensing

strapping option.

AM4/

LED_EN

I/O12 Amber indicator LED for port 4. Will be active low when LED

support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration,

this pin will be sampled at RESET_N negation to determine if LED support is enabled or disabled. Also, the active state of the LED will be determined as follows:

‘0’ = LED support is disabled, LED is inactive ‘1’ = LED Support is enabled, LED is active low.

AM3 I/O12 Amber indicator LED for port 3. Signal will be active low.

AM2/

MTT_EN

I/O12 Amber indicator LED for port 2. Will be active low when LED

support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration,

this pin will be sampled at RESET_N negation to determine if MTT support is disabled (STT only). Also, the active state of the LED will be determined as follows:

‘0’ = MTT support is disabled, LED is active high ‘1’ = MTT support is enabled, LED is active l ow.

AM1/

GANG_EN

I/O12 Amber indicator LED for port 1, Will be active low when LED

support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration,

this pin will be sampled at RESET_N negation to determine if downstream port power switching and current sensing are ganged, or individual port-by-port. Also, the active state of the LED will be determined as follows:

Port Power

Polarity strapping.

Over Current

Sense

USB Transceiver

Bias

‘0’ = Port-by-port sensing & switching, LED is active high ‘1’ = Ganged sensing & switching, LED is active low.

PRTPWR_POL I/O12 Port Power Polarity strapping determination for the active

signal polarity of the [4:1]PRTPWR pins. 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 [4:1]PRTPWR pins 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 logi c value will be latched internally, and will retain the active signal polarity for the PRTPWR[4:1] pins.

‘1’ = PRTPWR[4:1]_P/N pins have an active ‘high’ polarity ‘0’ = PRTPWR[4:1]_P/N pins have an active ‘low’ polarity

OCS[4:1]_N IPU Input from external current monitor indicating an over-

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

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

pin to set the transceiver’s internal bias settings.

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Datasheet

Table 4.1 4-Port Hub Pin Descriptions (continued)

NAME SYMBOL TYPE FUNCTION

SERIAL PORT INTERFACE

Serial Data/SMB

SDA/SMBDATA IOSD12 (Serial Data)/(SMB Data) signal.

Data

Serial Clock/SMB

SCL/SMBCLK IOSD12 (Serial Clock)/(SMB Clock) signal.

Clock

Configuration Programming

Select

Configuration Programming

Select

Configuration Programming

Select

CFG_SEL0 IOSD12 This multifunction pin is read on the rising edge of

RESET_N negation and will determine the hub configuration method as described in Table 4.2.

CFG_SEL1 I 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

Table 4.2.

CFG_SEL2 I This pin is read on the rising edge of RESET_N negation

and will determine the hub configuration method as described in Table 4.2.

Table 4.2 SMBus or EEPROM Interface Behavior

CFG_SEL2 CFG_SEL1 CFG_SEL0 SMBus or EEPROM interface behavior.

X 0 0 Configured as an SMBus slave for external download of user-

defined descriptors. SMBus slave address is 0101100

X 0 1 Configured as an SMBus slave for external download of user-

defined descriptors. SMBus slave address is 0101101 0 1 0 Internal Default Con figuration 1 1 0 Internal Default Con figuration via strapping options. X 1 1 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 I 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.

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Integrated USB 2.0 Compatible 4-Port Hub

Table 4.3 Miscellaneou s Pin s (continued)

NAME SYMBOL TYPE FUNCTION

Datasheet

RESET Input RESET_N IS This active low signal is used by the system to reset the

Self-Power /

Bus-Power

Detect

TEST Pins TEST[1:0] IPD Used for testing the chip. User must treat as a no-

Analog Test

Internal 1.8V

voltage

regulator

enable

NAME SYMBOL TYPE FUNCTION

VDD1P8 VDD18 +1.8V core power.

SELF_PWR I Detects availability of local self-power source.

ATEST/

REG_EN

Table 4.4 Power, Ground, and No Connect

AIO This signal is used for testing the analog section of the

chip. The minimum active low pulse is 1us.

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.

connect or connect to ground.

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

If the internal regulator is enabled, then VDD18 pin 54 must have a 4.7μF (or greater) ±20% (ESR <0.1Ω) capacitor to VSS

VDDAPLL3P3 VDDA33PLL +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

VDDAPLL1P8 VDDA18PLL +1.8V Filtered analog power for internal PLL.

If the internal regulator is enabled, then this pin must have a 4.7 to VSS

VDDIO3P3 VDD33 +3.3V I/O power.

VDDA3P3 VDDA33 +3.3V Filtered analog power.

VSS VSS Ground.

μF (or greater) ±20% (ESR <0.1Ω) capacitor

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Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Table 4.5 Buffer Type Descriptions

BUFFER DESCRIPTION

I Input. IPD Input, with a weak Internal pull-down. IPU Input, with a weak Internal pull-up.

IS Input with Schmitt trigger.

O12 Output 12mA.

I/O12 Input/Output, 12mA

IOSD12 Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1

requirements.

ICLKx XTAL Clock Input

OCLKx XTAL Clock Output

I-R 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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Integrated USB 2.0 Compatible 4-Port Hub

Chapter 5 Functional Block Description

5.1 4-Port Hub

SMSC’s USB 2.0 4-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 4-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 (some are mutually exclusive), 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 (with or without pin strapping option over-rides). In all cases, the configuration method will be determined by the CFG_SEL2, CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.

5.1.1.1 Vendor ID

Datasheet

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 Table 5.1) wil l be reported.

5.1.1.2 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 Table 5.1) will be reported.

5.1.1.3 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 Table 5.1) will be reported.

5.1.1.4 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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Datasheet

5.1.1.5 Port Indicators

Controls the use of LED indicator for Port status information. See Section 11.5.3 of the USB 2.0 Specification for additional details.

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the internal default option, the LED_EN pin enables/disables LED Indicator support.

5.1.1.6 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.

5.1.1.7 Multiple-TT Support

Selects between a mode where only one transaction translator is avail able for all ports (Single-TT), or each port gets a dedicated transaction translator (Multi-TT) {Note: The host may force Single-TT mode only}.

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the internal default option, the MTT_EN pin enables/disables MTT support.

5.1.1.8 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.

5.1.1.9 Current Sensing

Selects current sensing on a port-by-port basis, all ports ganged, or none(only for bus-powered hubs)The ability to support current sensing on a port or ganged basis is hardware implementation dependent.

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 det ermines if current sensing will be ganged, or none (ganged if self-powered, none if bus-powered)

5.1.1.10 Downstream Port Power Enabling

Enables all ports simultaneously (ganged), or port power is individually switched on and off on a portby-port basis. The ability to support power enabling on a port or ganged basis is hardware implementation dependent.

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the internal default option, the GANG_EN pin will confi gure the hub for ganged or individual port-by-port port power switching.

5.1.1.11 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 defin ed 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 automa tically causes

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

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DATASHEET

5.1.1.12 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 nonremovable.

5.1.1.13 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 contiguous, and must be in decreasing order starting with port 4.

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the internal default option, the PRT_DIS[1:0] pins will disable the appropriate ports.

5.1.1.14 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 C ontroller. The disabled ports must be contiguous, and must be in decreasing order starting with port 4.

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

This field is set by the OEM using either the SMBus or EEPROM interface options. When using the internal default option, the PRT_DIS[1:0] pins will disable the appropriate ports.

5.1.1.15 Dynamic Power

Controls the ability of the 4-Port Hub to automatically change from Self-Powered operation to BusPowered operation if the local power source is removed or is unavailable (and from Bu s-Powered to Self-Powered if the local power source is restored). {Note: If the local power source is available, the 4-port Hub will always switch to Self-Powered operation.}

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.

5.1.1.16 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.

5.1.1.17 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.

5.1.1.18 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.

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Datasheet

5.1.1.19 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.

5.1.1.20 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.

5.1.1.21 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.

5.1.1.22 Power Switching Polarity

The selection of active state “polarity” for the PRTPWR[4:1] pins is made by a strapp ing 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 with in 10 seconds.

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 Table 5.1 User-Define d 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: Extension s to the I2C Specification are not supported. The Hub acts as the master and generates the serial clock SCL, contro ls 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 Implementation Characteristics

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

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DATASHEET

5.2.1.2 Pull-Up Resistor

The Circuit board designer is required to place external pull-up resistors (10K Ω 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-b it addressing is NOT supported.

5.2.2 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).

5.2.3 EEPROM DATA

Table 5.1 User-De fined Descriptor Data

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

DEFAULT BYTE MSB:

FIELD

VID 1:0 2 0424 0424 Vendor ID (assigned by USB-IF). PID 3:2 2 4-port =

DID 5:4 2 0000 0000 Device ID (assigned by Manufacturer). Config Data

Byte 1 Config Data

Byte 2 Non

Removable Device

Port Disable Self-Powered

Port Disable Bus-Powered

Max Power Self-Powered

LSB

6 1 98 1C Configuration data byte #1 for Hub options.

7 1 90 90 Configuration data byte #2 for Hub options.

8 1 00 00 Defines the ports that contain attached

9 1 00 00 Selects the ports that will be permanently

A 1 00 00 Selects the ports that will be permanently

B 1 01 01 Max Current for this configurati on (exp ressed

SIZE

(BYTES)

CFG

SELF

(HEX)

2504

DEFAULT

CFG BUS

(HEX) DESCRIPTION

4-Port = 2504

Product ID (assigned by Manufacturer).

devices (this is used only when Hub is part of a compound device).

disabled

in 2mA units).

Max Power Bus-Powered

Hub Controller Max Current Self-Powered

Hub Controller Max Current Bus-Powered

Power-On Time

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C 1 64 64 Max Current for this configuration (expressed

in 2mA units).

D 1 01 01 Max Current (expressed in 2mA units).

E 1 64 64 Max Current (expressed i n 2mA units).

F 1 32 32 Time until power is stable.

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

5.2.3.1 EEPROM Offset 1:0(h) - Vendor ID

BIT

NUMBER BIT NAME DESCRIPTION

15:8 VID_MSB Most Significant Byte of the Vendor ID.

7:0 VID_LSB 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 PID_MSB Most Significant Byte of the Produ ct ID.

7:0 PID_LSB Least Significant Byte of the Product ID.

5.2.3.3 EEPROM Offset 5:4(h) - Device ID

BIT

NUMBER BIT NAME DESCRIPTION

15:8 DID_MSB Most Signi ficant Byte of the Device ID.

7:0 DID_LSB Least Significant Byte of the Device ID.

5.2.3.4 EEPROM Offset 6(h) - CONFIG_BYTE_1

BIT

NUMBER BIT NAME DESCRIPTION

7 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.

6 PORT_IND Port Indicator Su pport: Indicates implementation of LED indicators

0 = No LED indicators. 1 = LED indicators.

5 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!)

4 MTT_ENABLE Multi-TT enabl e: Enables one transaction translator per port operation.

0 = single TT for all ports. 1 = one TT per port (multiple TT’s supported)

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Integrated USB 2.0 Compatible 4-Port Hub

BIT

NUMBER BIT NAME DESCRIPTION

Datasheet

3 EOP_DISABLE EOP Disable: Disables EOP gene ration at EOF1 when no downstream

2:1 CURRENT_SNS Over Current Sense: Indicates whether current sensing is on a port-by-port

0 PORT_PWR Port Power Switching: Indicates whether port power switching is on a port-

directed traffic is in progress. 0 = EOP generation at EOF1 is enabled.

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

basis, or ganged, or no overcurrent sensing. 00 = Ganged sensing (all ports together). (Default for self-power)

01 = Individual port-by-port. 1x = Over current sensing not supported. (may be used with Bus-Powered configurations only!, and is the default for bus-power)

by-port basis or ganged. 0 = Ganged switching (all ports together)

1 = Individual port-by-port switching.

5.2.3.5 EEPROM Offset 7(h) - CONFIG_BYTE_2

BIT

NUMBER BIT NAME DESCRIPTION

7 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.(Default)

6 Reserved Reserved

5:4 OC_TIMER OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms 01 = 2ms (Default) 10 = 4ms 11 = 6 m s

3 COMPOUND Compound Device: Designate s if Hub is part of a compound device.

0 = No. (Default) 1 = Yes, Hub is part of a compound device.

2:0 Reserved Reserved.

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Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

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= Reserved

Bit 6= Reserved Bit 5= Reserved Bit 4= 1; Port 4 non-removable. Bit 3= 1; Port 3 non-removable. 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= Reserved Bit 6= Reserved Bit 5= Reserved Bit 4= 1; Port 4 is disabled. Bit 3= 1; Port 3 is disabled. 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

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Integrated USB 2.0 Compatible 4-Port Hub

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

BIT

NUMBER BIT NAME DESCRIPTION

Datasheet

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 combi ned 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 combi ned 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 Se lf-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a selfpowered 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 Bu s-Powered: Value in 2mA increments that the

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, "In valid Protocol Response Behavior," on

page 26. 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 27.

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 register address field is the internal address of the register to be accessed. The register data field is the data that the host is attempting to write to the register or th e contents of the register that the host is attempting to read.

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

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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 th e following SMBus tables:

Denotes Master-to-Slave Denotes Slave-to-Master

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

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

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Table 5. 2 SMBus Write Byte Protocol

Field: Start Slave Addr Wr

Bits:1 71181811

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 Table 5.3 is performed corre ctly. Only one byte is transferred at a time for a Read Byte protocol.

Table 5.3 SMBus Read Byte Protocol

Field: Start Slave

Addr

Bits: 1 7 1 1 8 1 1 7 1 1 8 1 1

Ack Reg.

Ack Reg. Addr Ack Reg. Data Ack Stop

Addr

Ack Start Slave

Addr

Rd 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 exceed s 25ms (T have detected this condition must reset their communication and be able to receive a new START condition no later than 35ms (T

Note: Some simple devices do not contain a clock low drive ci rcuit; this si mple kind of device typica lly

resets its communications port after a start or stop condition.

TIMEOUT, MAX

5.3.5 Stretching the SCLK Signal

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

5.3.6 SMBus Timing

The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing in the “Timing Diagram” section.

5.3.7 Bus Reset Sequence

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

TIMEOUT, MIN

). Devices that

5.3.8 SMBus Alert Response Address

The SMBALERT# signal is not supported by the Hub.

5.3.9 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 R/W REGISTER NAME ABBR

00h R/W Status/Command STCD 7 6 5 4 3 2 1 0 01h R/W VID LSB VIDL 7 6 5 4 3 2 1 0 02hR/WVID MSB VIDM7 6543210 03h R/W PID LSB PIDL 7 6 5 4 3 2 1 0 04hR/WPID MSB PIDM7 6543210 05h R/W DID LSB DIDL 7 6 5 4 3 2 1 0 06h R/W DID MSB DIDM 7 6 5 4 3 2 1 0 07h R/W Config Data Byte 1 CFG1 7 6 5 4 3 2 1 0

BIT 7

(MSB) BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1

BIT 0 (LSB)

08h R/W Config Data Byte 2 CFG2 7 6 5 4 3 2 1 0 09h R/W Non-Removable

Devices 0Ah R/W Port Disable (Self) PDS 7 6 5 4 3 2 1 0 0Bh R/W Port Disable (Bus) PDB 7 6 5 4 3 2 1 0

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NRD 7 6 5 4 3 2 1 0

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Integrated USB 2.0 Compatible 4-Port Hub

Table 5.4 SMBus Slave Interface Register Map (continued)

Datasheet

REG

ADDR R/W REGISTER NAME ABBR

BIT 7

(MSB) BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1

0Ch R/W Max Power (Self) MAXPS 7 6 5 4 3 2 1 0 0Dh R/W Max Power (Bus) MAXPB 7 6 5 4 3 2 1 0 0Eh R/W Hub Controller

HCMCS 7 6 5 4 3 2 1 0

Max Current (Self) 0Fh R/W Hub Controller

HCMCB 7 6 5 4 3 2 1 0

Max Current (bus) 10h R/W Power-on Time PWRT 7 6 5 4 3 2 1 0

5.3.9.1 Register 00h: Status/Command (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:3 Reserved Reserved. {Note: Software must never write a ‘1’ to these bits}

2 RESET Reset the SMBus Interface and internal memory back to RESET_N assertion

default settings. {Note: During this reset, this bit is automatically cle ared to its default value of 0.}

0 = Normal Run/Idle State. 1 = Force a reset.

BIT 0 (LSB)

1 WRITE_PROT Write Protect: Th e external SMBus ho st 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 no t write protected. 1 = The internal memory (address range 01-10h) is “write-prote cted” to prevent unintentional data corruption.}

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

0 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 Register 01h: Vendor ID (LSB) (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 VID_LSB Least Significant Byte of the Vendor ID.

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5.3.9.3 Register 02h: Vendor ID (MSB) (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 VID_MSB Most Significant Byte of the Vendor ID.

5.3.9.4 Register 03h: Product ID (LSB) (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 PID_LSB Least Significant Byte of the Product ID.

5.3.9.5 Register 04h: Product ID (MSB) (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 PID_MSB Most Significant Byte of the Product ID.

5.3.9.6 Register 05h: Device ID (LSB) (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 DID_LSB Least Significant Byte of the Device ID.

5.3.9.7 Register 06h: Device ID (MSB) (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 DID_MSB Most Significa nt Byte of the Device ID.

5.3.9.8 Register 07h: CONFIG_BYTE_1 (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7 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.

6 PORT_IND Port Indicator Support: Indicates implementation of LED indicators

0 = No LED indicators. 1 = LED indicators.

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Integrated USB 2.0 Compatible 4-Port Hub

BIT

NUMBER BIT NAME DESCRIPTION

Datasheet

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

4 MTT_ENABLE Multi-TT enabl e: Enables one transaction translator per port operation.

3 EOP_DISABLE EOP Disable: Disables EOP generation of EOF1 whe n in Full-Speed mode.

2:1 CURRENT_SNS Over Current Sense: Indicates whether current sensing is on a port-by-port

0 PORT_PWR Port Power Switching: Indicates whether port power switching is on a port-

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!)

0 = single TT for all ports. 1 = one TT per port (multiple TT’s supported)

0 = EOP generation is normal. 1 = EOP generation is disabled.

basis, or ganged, or no overcurrent sensing. 00 = Ganged sensing (all ports together).

01 = Individual port-by-port. 1x = Over current sensing not supported. (must only be used with BusPowered configurations!)

by-port basis or ganged. 0 = Ganged switching (all ports together)

1 = Individual port-by-port switching.

5.3.9.9 Register 08h: Configuration Data Byte 2 (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

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

6 Reserved Reserved

5:4 OC_TIMER OverCurrent Timer: Over Current Timer delay.

3 COMPOUND Compound Device: Designate s if Hub is part of a compound device.

2:0 Reserved Reserved

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.

00 = 0.1ms 01 = 2ms 10 = 4ms 11 = 6 m s

0 = No. 1 = Yes, Hub is part of a compound device.

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5.3.9.10 Register 09h: Non-Removable Device (Reset = 0x00)

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= Reserved

Bit 6= Reserved Bit 5= Reserved Bit 4= 1; Port 4 non-removable. Bit 3= 1; Port 3 non-removable. Bit 2= 1; Port 2 non-removable. Bit 1= 1; Port 1 non removable. Bit 0 is Reserved, always = ‘0’.

5.3.9.11 Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)

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= Reserved

Bit 6= Reserved Bit 5= Reserved Bit 4= 1; Port 4 is disabled. Bit 3= 1; Port 3 is disabled. Bit 2= 1; Port 2 is disabled. Bit 1= 1; Port 1 is disabled. Bit 0 is Reserved, always = ‘0’

5.3.9.12 Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00)

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= Reserved

Bit 6= Reserved Bit 5= Reserved Bit 4= 1; Port 4 is disabled. Bit 3= 1; Port 3 is disabled. Bit 2= 1; Port 2 is disabled. Bit 1= 1; Port 1 is disabled. Bit 0 is Reserved, always = ‘0’

5.3.9.13 Register 0Ch: Max Power For Self Powered Operation (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

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7:0 MAX_PWR_SP Max Power Self_Powered: Value in 2mA increments that the Hub consumes

Note: The USB 2.0 Specification does not permit this value to exceed 100mA

A value of 50 (decimal) indicates 100mA.

5.3.9.14 Register 0Dh: Max Power For Bus Powered Operation (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 MAX_PWR_BP Max Power Bus_Powered: Value in 2mA increments that the Hub consumes

A value of 50 (decimal) indicates 100mA.

5.3.9.15 Register 0Eh: Hub Controller Max Current For Self Powered Operation (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 HC_MAX_C_SP Hub Controller Max Current Se lf-Powered: Value in 2mA increments that the

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 Register 0Fh: Hub Controller Max Current For Bus Powered Operation (Reset = 0x00)

BIT

NUMBER BIT NAME DESCRIPTION

7:0 HC_MAX_C_BP Hub Controller Max Current Bu s-Powered: Value in 2mA increments that the

Hub consumes from an upstream port (VBUS) when operating as a buspowered 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 permanentl y attached peripheral if the hub is configured as a compound device.

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

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5.3.9.17 Register 10h: Power-On Time (Reset = 0x00)

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 Table 5.4 are the defined reg isters in the Hub. Reads to undefined registers return 00h. Writes to undefined registers have no effect and do not return an error.

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 Table 5.1 on page 20 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 defaul t 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 d efault values will be used for the bits & registers that are not controlled by a strapping option pin. Please refer to Table 5.1 on page 20 for the internal default values that are loaded when this option is selected.

The Amber and Green LED pins are sampled after RESET_N negation, and the logic values are used to configure the hub if the internal default co nfiguration mode is selected. The implementation shown below (see Figure 5.1) shows a recommended passive scheme. When a pi n is configure d 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.

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HUB

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Strap High

50K

GR1

GR2

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.

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.

Strap Low

50K

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).

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5.6.1.1 RESET_N for Strapping Option Configuration

Hardware

reset

asserted

Read Strap

Options

Drive Strap

Outputs to

inactive

levels

Attach

USB

Upstream

t5 t6

USB Reset

recovery

Idle

t7 t8

Start

completion

request

response

Valid

Don’t Care

Driven by Hub if strap is an output.

RESET_N

VSS

Strap Pins

Don’t Care

VSS

Figure 5.2 Reset_N Timing for Default/Strap Option Mode

T able 5.5 Reset_N Timing for Default/Strap Option Mode

NAME DESCRIPTION MIN TYP MAX UNITS

t1 RESET_N Asserted. 1 μsec t2 Strap Setup Time 16.7 nsec t3 Strap Hold Time. 16.7 1400 nsec t4 hub outputs driven to inactive logic states 2.0 1.5 μsec t5 USB Attach (See Note). 100 msec t6 Host acknowledges attach and signals USB

100 msec

Reset. t7 USB Idle. undefined msec t8 Completion time for requests (with or without data

5 msec

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 th e operating levels mandated in Section Ch apter 8, "DC

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

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5.6.1.2 RESET_N for EEPROM Configuration

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Hardware

reset

asserted

Read Strap

Options

Read EEPROM

Set Options

Attach

USB

Upstream

USB Reset

recovery

Idle

Start

completion

request

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

t1 RESET_N Asserted. 1 μsec t2 Hub Recovery/Stabilization. 500 μsec t3 EEPROM Read / Hub Config. 2.0 99.5 msec t4 USB Attach (See Note). 100 msec

t5 t6 t7

t5 Host acknowledges attach and signals USB

100 msec

Reset. t6 USB Idle. undefined msec t7 Completion time for requests (with or without data

5 msec

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.

 All Power Supplies must have reached th e operating levels mandated in Section Ch apter 8, "DC

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

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5.6.1.3 RESET_N for SMBus Slave Configuration

Start

completion

request

response

RESET_N

VSS

Hardware

reset

asserted

Reset

Negation

SMBus Code

Load

t2 t4

Hub PHY

Stabilization

Attach

USB

Upstream

USB Reset

recovery

Idle

t6 t7

Figure 5.4 Reset_N Timing for SMBus Mode

T able 5.7 Reset_N T iming for SMBus Mode

NAME DESCRIPTION MIN TYP MAX UNITS

t1 RESET_N Asserted. 1 μsec t2 Hub Recovery/Stabilization. 500 μsec t3 SMBus Code Load (See Note). 10 99.5 msec t4 Hub Configuration and USB Attach. 100 msec t5 Host acknowledges attach and signals USB

100 msec

Reset. t6 USB Idle. Undefined msec t7 Completion time for requests (with or without data

5 msec

stage).

Notes:

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

circuitry must not consume more than 100mA from the upstream USB power source d uring 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 th e operating levels mandated in Section Ch apter 8, "DC

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

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 Hu b does not propagate the upstream USB reset to downstream devices.

1. Sets default address to 0.

2. Sets configuration to: Unconfigured.

3. Negates PRTPWR[4:1] to all downstream ports.

4. Clears all TT buffers.

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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 Backward Compatibility to the USB20H04

The USB2504/USB2504A is pin compatible to the USB20H04, but is not designed to be a direct dropin replacement. Many existing USB20H04 designs may accommodate a USB2504 /USB2504A in place of the USB20H04, as long as specific Bill-Of-Material (BOM) modifications and population option changes are implemented. Since each design is unique, every customer considering a cha nge from a USB20H04 to a USB2504/USB2504A should contact SMSC Applications Engineering for assistance.

6.1 Internal 1.8V regulator

The USB2504/USB2504A has two internal 1.8V regulators that are enabled by default (ATEST pin contains an internal pull-up, and was specified as a No-Connect in the USB20H04 datasheet). Each regulator requires a separate 4.7uF Low ESR capacitor to ground. The USB20H04 designs that directly connect the Digital and Analog 1.8V pins together will no t support a USB2504/USB2504A (unless the internal regulators are disabled).

6.2 Configuration by Internal Defaults

The internal default settings that are loaded when this option is selected are very similar (but not identical) to those that were loaded in the USB20H04. The CFG_SEL[2:0] pins will properly select this method if the existing USB20H04 design was set-up to load the con figuration via internal defaults.

The USB2504/USB2504A has pin strapping options that enable mo dification of the interna l defa ult lo ad without requiring an EEPROM. The CFG_SEL2 pin (pin 59 ) on the USB2504/USB2504A was a VSS pin on the USB20H04 so this functionality will be disabled when a USB2504/USB2504A is placed into a USB20H04 design.

6.3 Configuration by SMBus

The CFG_SEL[2:0] pins will properly select this method if the existing USB20H04 design was set-up to load the configuration via SMBus. The USB2504/USB2504 A has a few additional reg isters, and has also moved some of the configuration bits so the actual SMBus code load itself will need to be modified. If a USB20H04 SMBus load is programmed into a USB2504/USB2504A, the results are unpredictable.

6.4 PRTPWR_POL

The USB2504/USB2504A has a new strapping option that enabl es the port power control active state to be either active-high or active-low. The USB20H04 only provided active-low port power control. The PRTPWR_POL pin on the USB2504/USB2504A is pin 23, which was a VSS pin on the USB20H04, so by default, a USB20H04 design will select active-low port port control.

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Chapter 7 XNOR Test

XNOR continuity tests all signal pins on the Hub (every pin except for NC, XTAL1/CLKIN, XTAL2, ATEST/REG_EN, RBIAS, TEST1, Power, and Ground). This functionality is enabled by driving TEST1 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 sh ould toggle.

Integrated USB 2.0 Compatible 4-Port Hub

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Chapter 8 DC Parameters

8.1 Maximum Guaranteed Ratings

PARAMETER SYMBOL MIN MAX UNITS COMMENTS

Storage

Temperature

Lead

Temperature

1.8V supply voltage

3.3V supply voltage

Voltage on any

I/O pin

Voltage on

XTAL1

Voltage on

XTAL2

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

DDA18PLL

DD18

DDA33

DDA33PLL

DD33

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 possibi lity exists, it is suggested that a clamp circuit be used.

-55 150 °C

325 °C Soldering < 10 seconds

-0.5 2.5 V

-0.5 4.0 V

-0.5 (3.3V supply voltage + 2) ≤ 6V

-0.5 4.0 V

-0.5 V

+ 0.3V V

DD18

SMSC USB2504/USB2504A 41 Revision 2.3 (08-27-07)

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

8.2 Recommended Operating Conditions

PARAMETER SYMBOL MIN MAX UNITS COMMENTS

Datasheet

Operating

Temperature

1.8V supply voltage V

3.3V supply voltage V

DDA18PLL

DD18

DDA33

DDA33PLL

DD33

070°C

1.71 1.98 V

3.0 3.6 V

Voltage on any I/O pin -0.3 5.5 V If any 3.3V supply voltage drops

below 3.0V, then the MAX becomes:

(3.3V supply voltage + 0.5) Voltage on XTAL1 -0.3 V Voltage on XTAL2 -0.3 V

DDA33

DD18

V V

Table 8.1 DC Electrical Characteristics

PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS

I, IS Type Input Buffer Low Input Level

ILI

0.8

TTL Levels High Input Level Input Leakage Hysteresis (‘IS’ Only)

Input Buffer with Pull-Up (IPU)

Low Input Level High Input Level Low Input Leakage High Input Leakage

Input Buffer with Pull-Down IPD

Low Input Level High Input Level Low Input Leakage High Input Leakage

IHI

HYSI

ILI

IHI

ILL

IHL

ILI

IHI

ILL

IHL

2.0

-10

250 300

2.0

+26

-10

2.0

+10

-22

+10 350

0.8

+72 +10

0.8

-10

-82

V uA uA

= 0 to V

TTL Levels

= 0

= V

DD33

TTL Levels

= 0

= V

DD33

Revision 2.3 (08-27-07) 42 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

T able 8.1 DC Electrical Characteristics (continued)

PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS

ICLK Input Buffer Low Input Level High Input Level Input Leakage Hysteresis

O12 and I/O12 Type Buffer Low Output Level High Output Level Output Leakage

OD12 Type Buffer Low Output Level Output Leakage

I/OSD12 Type Buffer

V V

HYSC

V V

ILCK

IHCK

2.0

-10 50

2.4

-10

0.8

+10 100

0.4

+10

0.4

+10

V V

µA

TTL Levels

= 0 to V

= 12mA @ V

DD33

IOH = -4mA @ V

= 0 to V

DD33

(Note 1)

= 12mA @ V

= 0 to V

DD33

(Note 1)

DD33

= 3.3V

Low Output Level Output Leakage Hysteresis

IO-U (Note 2)

I-R (Note 3)

Supply Current Unconfigured

High-Speed Host Full-Speed Host

Supply Current Configured (High-Speed Host)

2 Ports @ FS/LS 2 Ports @ HS 1 Port HS, 1 Port FS/LS 3 Ports @ HS 4 Ports @ HS

HYSI

CCINIT

HCC2

HCH2

HCH1C1

HCH3

HCC4

-10

250 300

100

190 235 215 265 295

0.4 +10 350

µA

mA mA

mA mA mA mA mA

IOL = 12 mA @ V

= 0 to V

DD33

(Note 1)

Total from all supplies

= 3.3V

SMSC USB2504/USB2504A 43 Revision 2.3 (08-27-07)

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

T able 8.1 DC Electrical Characteristics (continued)

PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS

Datasheet

Supply Current Configured (Full-Speed Host)

1 Port 2 Ports 3 Ports 4 Ports

Supply Current Suspend

Supply Current Reset

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 TA = 25°C; fc = 1MHz; V

FCC1

FCC2

FCC3

FCC4

CSBY

RST

Total from all supplies

mA 150 155 160

mA 165

265 uA Total from all supplies.

150 uA Total from all supplies.

= 3.3V

DD33

LIMITS

PARAMETER SYMBOL MIN TYP MAX UNIT TEST CONDITION

Clock Input Capacitance

Input Capacitance C Output Capacitance C

OUT

12 pF All pins except USB pins (and pins under

test tied to AC ground)

8pF

12 pF

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.

Revision 2.3 (08-27-07) 44 SMSC USB2504/USB2504A

DATASHEET

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Chapter 9 AC Specifications

9.1 Oscillator/Clock

Crystal: Paralle l Resonant, Fundamental Mode, 24 MHz ±100ppm. External Clock: 50% Duty cycle ± 10%, 24 MHz ± 100ppm, Jitter < 100ps rms.

9.1.1 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).

9.1.2 I2C EEPROM:

Frequency is fixed at 59KHz ± 20%.

9.1.3 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.

SMSC USB2504/USB2504A 45 Revision 2.3 (08-27-07)

DATASHEET

Chapter 10 Package Outline

Integrated USB 2.0 Compatible 4-Port Hub

Datasheet

Figure 10.1 64 Pin TQFP Package Outlin e (10x10x1.4 mm body - 2 mm footprint)

Table 10.1 64 Pin TQFP Package Parameters

MIN NOMINAL MAX REMARKS

A ~ ~ 1.60 Overall Package Height A1 0.05 ~ 0.15 Standoff A2 1.35 ~ 1.45 Body Thickness

D 11.80 ~ 12.20 X Span

D1 9.80 ~ 10.2 0 X body Size

E 11.80 ~ 12.20 Y Span E1 9.80 ~ 10.20 Y body Size

H 0.09 ~ 0.20 Lead Frame Thickness

L 0.45 0.60 0.75 Lead Foot Length L1 ~ 1.00 ~ Lead Length

e 0.50 Basic Lead Pitch

W 0.17 0.22 0.27 Lead Width R1 0.08 ~ ~ Lead Shoulder Radius R2 0.08 ~ 0.20 Lead Foot Radius

ccc ~ ~ 0.08 Coplanarity

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 per side.

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.

Lead Foot Angle

Revision 2.3 (08-27-07) 46 SMSC USB2504/USB2504A

DATASHEET

SMSC USB2504, USB2504A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Chapter 1 General Description

1.1 OEM Selectable Features

Chapter 2 Pin Table 4-Port

Table 2. 1 4-Port Pin Table for 64-TQF P

Chapter 3 Pin Configuration 4-Port Hub

Figure 3.1 4-Port 64 Pi n TQFP

Chapter 4 4-Port Hub Block Diagram

Figure 4.1 4-Port Block Diagram

Ta ble 4.1 4-Port Hub Pin Descriptions

Table 4.2 SMBus or EEPROM Interface Behavior

Table 4.3 Miscellaneous Pins

Table 4.4 Power, Ground, and No Connect

Table 4.5 Buffer Type Descriptions

Chapter 5 Functional Block Description

5.1 4-Port Hub

5.1.1 Hub Configuration Options

5.1.2 VBus Detect

5.2 EEPROM Interface

5.2.1 I2C EEPROM

5.2.2 In-Circuit EEPROM Programming

5.2.3 EEPROM DATA

Table 5.1 User-De fined Descriptor Data

5.3 SMBus Slave Interface

5.3.1 Bus Protocols

Table 5. 2 SMBus Write Byte Protocol

Table 5.3 SMBus Read Byte Protocol

5.3.2 Invalid Protocol Response Behavior

5.3.3 General Call Address Response

5.3.4 Slave Device Time-Out

5.3.5 Stretching the SCLK Signal

5.3.6 SMBus Timing

5.3.7 Bus Reset Sequence

5.3.8 SMBus Alert Response Address

5.3.9 Internal SMBus Memory Register Set

Table 5.4 SMBus Slave Interface Register Map

5.4 Default Configuration Option:

5.5 Default Strapping Options:

Figure 5.1 LED Strapping Option

5.6 Reset

5.6.1 External Hardware RESET_N

Figure 5.2 Reset_N Timing for Default/Strap Option Mode

T able 5.5 Reset_N Timing for Default/Strap Option Mode

Figure 5.3 Reset_N Timing for EEPROM Mode

Table 5.6 Reset_N Timing for EEPROM Mode

Figure 5.4 Reset_N Timing for SMBus Mode

T able 5.7 Reset_N T iming for SMBus Mode

5.6.2 USB Bus Reset

Chapter 6 Backward Compatibility to the USB20H04

6.1 Internal 1.8V regulator

6.2 Configuration by Internal Defaults

6.3 Configuration by SMBus

6.4 PRTPWR_POL

Chapter 7 XNOR Test

Chapter 8 DC Parameters

8.1 Maximum Guaranteed Ratings

8.2 Recommended Operating Conditions

Table 8.1 DC Electrical Characteristics

Chapter 9 AC Specifications

9.1 Oscillator/Clock

9.1.1 SMBus Interface:

9.1.2 I2C EEPROM:

9.1.3 USB 2.0

Chapter 10 Package Outline

Figure 10.1 64 Pin TQFP Package Outlin e (10x10x1.4 mm body - 2 mm footprint)

Table 10.1 64 Pin TQFP Package Parameters