USB2504 SMSC Corporation, USB2504 Datasheet - Page 11

• Manufacturer Part Number: USB2504
• Description: Integrated USB 2.0 Compatible 4-Port Hub
• Manufacturer: SMSC Corporation

Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
SMSC USB2504/USB2504A
High-Speed USB
strapping option.
strapping option.
Port [2:1] Green
Port 4:3 Green
Port Disable
USB Power
Removable
Port Non-
Enable
NAME
Data
LED
LED
&
&
NON_REM[1:0]
PRTPWR[4:1]
PRT_DIS[1:0]
USBDN[4:1]
USBDP[4:1]
SYMBOL
GR[4:3]/
GR[2:1]/
Table 4.1 4-Port Hub Pin Descriptions (continued)
4-PORT USB 2.0 HUB INTERFACE
TYPE
I/O12
I/O12
IO-U
O12
DATASHEET
These pins connect to the downstream USB peripheral
devices attached to the Hub’s ports.
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.
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.
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 (non-
removable) 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.
11
FUNCTION
Revision 2.1 (12-06-06)