SMSC USB2507 User Manual

Integrated USB 2.0 Compatible 7-Port Hub

Revision 2.3 (08-27-07)

10

SMSC USB2507

High-Speed USB 

Data

USBDN[7:1]
USBDP[7:1]

IO-U

These pins connect to the downstream USB peripheral 
devices attached to the Hub’s ports. 

USB Power 

Enable

PRTPWR[7:1]

O12

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

Green indicator LED’s for ports[7:5]. LED is active low

Port 4:3 Green 

LED

&

Port Disable 

strapping option.

GR[4:3]/

PRT_DIS[1:0]

I/O12

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:

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

&

Port Non-

Removable 

strapping option.

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:

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.