USB2524 datasheet(14/57 Pages) SMSC

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USB MultiSwitchTM Hub

Datasheet

Revision 1.91 (08-22-07)

SMSC USB2524

DATASHEET

Assign

Downstream

Ports to Upstream

Host Ports

PRT_ASSIGN

[3:0]

Port Assign Interface: Operates in either Embedded mode,

or Peripheral mode. See Chapter 6, Assigning Ports for

additional details.

SERIAL PORT INTERFACE

Serial Data/SMB

Data

SDA/SMBDATA

IOSD12

(Serial Data)/(SMB Data) signal.

Serial Clock/SMB

Clock

Configuration

Programming

Select

SCL/SMBCLK/

CFG_SEL0

IOSD12

(Serial Clock)/(SMB Clock) signal.

CFG_SEL0: The logic state of this multifunction pin is

internally latched on the rising edge of RESET_N

(RESET_N negation), and will determine the hub

configuration method as described in Table 4.2.

Configuration

Programming

Select

CFG_SEL1

The logic state of this pin is internally latched on the rising

edge of RESET_N (RESET_N negation), and will determine

the hub configuration method as described in Table 4.2.

Configuration

Programming

Select

CFG_SEL2

The logic state of this pin is internally latched on the rising

edge of RESET_N (RESET_N negation), and will determine

the hub configuration method as described in Table 4.2.

Table 4.2 SMBus or EEPROM Interface Behavior

NAME

FUNCTION

CFG_SEL2

CFG_SEL1

CFG_SEL0

SMBus or EEPROM interface behavior.

Internal Default Configuration

PRT_ASSIGN[3:0] = Embedded Mode.

Strap options on pins LED_A[4:1]_N are enabled.

LED Mode = USB Mode

Configured as an SMBus slave for external download of

user-defined descriptors.

SMBus slave address is :0101100

Strap options on pins LED_A[4:1]_N are disabled

LED Mode = See Chapter 8, LED Interface Description

Internal Default Configuration

PRT_ASSIGN[3:0] = Peripheral Mode (Level Triggered)

Strap options on pins LED_A[4:1]_N are enabled.

No support for unassigned Ports.

LED Mode = USB Mode

2-wire (I2C) EEPROMS are supported,

LED Mode = See Chapter 8, LED Interface Description

Table 4.1 Switching Hub Pin Descriptions (continued)

NAME

SYMBOL

TYPE

FUNCTION

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