USB MultiSwitchTM Hub

 

 

 

 

 

 

Datasheet

 

 

Table 4.1 Switching Hub Pin Descriptions (continued)

 

 

 

 

 

 

 

NAME

SYMBOL

 

TYPE

FUNCTION

 

 

 

 

 

 

 

Assign

PRT_ASSIGN

 

I

Port Assign Interface: Operates in either Embedded mode,

Downstream

[3:0]

 

 

 

or Peripheral mode. See Chapter 6, Assigning Ports for

Ports to Upstream

 

 

 

 

additional details.

Host Ports

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

CFG_SEL0

 

 

 

 

 

CFG_SEL0: The logic state of this multifunction pin is

&

 

 

 

 

 

 

 

 

 

 

 

internally latched on the rising edge of RESET_N

Configuration

 

 

 

 

(RESET_N negation), and will determine the hub

 

 

 

 

configuration method as described in Table 4.2.

Programming

 

 

 

 

Select

 

 

 

 

 

 

 

 

 

 

 

 

Configuration

CFG_SEL1

 

I

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

Programming

 

 

 

 

edge of RESET_N (RESET_N negation), and will determine

Select

 

 

 

 

the hub configuration method as described in Table 4.2.

 

 

 

 

 

 

 

Configuration

CFG_SEL2

 

I

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

Programming

 

 

 

 

edge of RESET_N (RESET_N negation), and will determine

Select

 

 

 

 

the hub configuration method as described in Table 4.2.

 

 

 

 

 

 

 

 

Table 4.2 SMBus or EEPROM Interface Behavior

 

 

 

 

 

 

 

NAME

 

NAME

 

 

NAME

FUNCTION

 

 

 

 

 

 

CFG_SEL2

 

CFG_SEL1

 

CFG_SEL0

SMBus or EEPROM interface behavior.

 

 

 

 

 

 

 

0

 

0

 

 

0

Internal Default Configuration

 

 

 

 

 

 

„ PRT_ASSIGN[3:0] = Embedded Mode.

 

 

 

 

 

 

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

 

 

 

 

 

 

„ LED Mode = USB Mode

 

 

 

 

 

 

 

0

 

0

 

 

1

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

 

 

 

 

 

 

 

0

 

1

 

 

0

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

 

 

 

 

 

 

 

0

 

1

 

 

1

2-wire (I2C) EEPROMS are supported,

 

 

 

 

 

 

„ LED Mode = See Chapter 8, LED Interface Description

 

 

 

 

 

 

 

Revision 1.91 (08-22-07)

14

SMSC USB2524

 

DATASHEET