USB MultiSwitch
TM
Hub
Datasheet
Revision 1.91 (08-22-07)
14
SMSC USB2524
DATASHEET
Assign
Downstream
Ports to Upstream
Host Ports
PRT_ASSIGN
[3:0]
I
Port Assign Interface: Operates in either Embedded mode,
or Peripheral mode. See
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
.
Configuration
Programming
Select
CFG_SEL1
I
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
.
Configuration
Programming
Select
CFG_SEL2
I
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 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
Table 4.1 Switching Hub Pin Descriptions (continued)
NAME
SYMBOL
TYPE
FUNCTION
