Input/Output Interfaces

5.7Universal Serial Bus Interface

The Universal Serial Bus (USB) interface provides asynchronous/isochronous data transfers with compatible peripherals such as keyboards, printers, or modems. This high-speed interface supports hot-plugging of compatible devices, making possible system configuration changes without powering down or even rebooting systems.

These systems provide eight USB ports, two front panel USB ports (which may be disabled) and six USB ports on the rear panel. The USB ports are dynamically configured to either a USB 1.1 controller or the USB 2.0 controller depending on the capability of the peripheral device. The

1.1controllers provide a maximum transfer rate of 12 Mb/s while the 2.0 controller provides a maximum transfer rate of 480 Mb/s. Table 5-17 shows the mapping of the USB ports.

USB

Table 5-17.

ICH8 USB Port Mapping

ICH8

 

USB Connector Location

 

 

 

 

 

 

Controller

Signals

USDT, SFF, ST Form Factors

MT & CMT Form Factors

 

 

 

 

USB 1.1 #1,

Data 0P, 0N

Rear panel quad USB stack

Rear panel quad USB stack

USB 2.0 #1

 

 

 

Data 1P, 1N

Rear panel quad USB stack

Rear panel quad USB stack

 

 

 

 

 

USB 1.1 #2

Data 2P, 2N

Rear panel dual USB with RJ-45

Rear panel quad USB stack

USB 2.0 #1

 

 

 

Data 3P, 3N

Rear panel dual USB with RJ-45

Rear panel quad USB stack

 

 

 

 

 

USB 1.1 #3

Data 4-5P/N

Not used

Not used

USB 2.0 #1

 

 

 

 

 

 

 

USB 1.1 #4

Data 6P, 6N

Rear panel quad USB stack

Rear panel dual USB with RJ-45

USB 2.0 #2

 

 

 

Data 7P, 7N

Rear panel quad USB stack

Rear panel dual USB with RJ-45

 

 

 

 

 

USB 1.1 #5

Data 8P, 8N

Front panel USB

Front panel USB

USB 2.0 #2

 

 

 

Data 9P, 9N

Front panel USB

Front panel USB

 

 

 

 

 

 

5-22

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Technical Reference Guide