Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Table 4.1 7-Port Hub Pin Descriptions (continued)
NAME
SYMBOL
TYPE
FUNCTION
7-PORT USB 2.0 HUB INTERFACE
High-Speed USB
Data
USBDN[7:1]
USBDP[7:1]
IO-U
O12
These pins connect to the downstream USB peripheral
devices attached to the Hub’s ports.
USB Power
Enable
PRTPWR[7:1]
Enables power to USB peripheral devices (downstream).
The active signal level of the PRTPWR7:1 pins is
determined by the Power Polarity Strapping function of the
PRTPWR_POL pin.
Ports [7:5] Green
LED
GR[7:5]
I/O12
I/O12
Green indicator LED’s for ports[7:5]. LED is active low
Port 4:3 Green
LED
GR[4:3]/
PRT_DIS[1:0]
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 [7:5] will be permanently disabled. Also,
the active state of the LED’s will be determined as follows:
Port Disable
strapping option.
PRT_DIS[1:0] = ‘00’, All ports are enabled,
GR4 is active high,
GR3 is active high.
PRT_DIS[1:0] = ‘01’, Port 7 is disabled,
GR4 is active high,
GR3 is active low.
PRT_DIS[1:0] = ‘10’, Ports 7 & 6 are disabled,
GR4 is active low,
GR3 is active high.
PRT_DIS[1:0] = ‘11’, Ports 7, 6 & 5 are disabled,
GR4 is active low,
GR3 is active low.
Port [2:1] Green
LED
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 (non-
removable) devices. Also, the active state of the LED’s will
be determined as follows:
Port Non-
Removable
strapping option.
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.
Ports [7:5] Amber
LED
AM[7:5]
I/O12
Amber indicator LED’s for ports [7:5], LED is active low.
Revision 2.3 (08-27-07)
SMSC USB2507
DATA1S0HEET
SMSC [ SMSC CORPORATION ]
