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Input/Output Interfaces
5.7 Universal 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
1.1 controllers 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
Controller Signals
USB Connector Location
USDT, SFF, ST Form Factors MT & CMT Form Factors
USB 1.1 #1,
USB 2.0 #1
Data 0P, 0N Rear panel quad USB stack Rear panel quad USB stack
Data 1P, 1N Rear panel quad USB stack Rear panel quad USB stack
USB 1.1 #2
USB 2.0 #1
Data 2P, 2N Rear panel dual USB with RJ-45 Rear panel quad USB stack
Data 3P, 3N Rear panel dual USB with RJ-45 Rear panel quad USB stack
USB 1.1 #3
USB 2.0 #1
Data 4-5P/N Not used Not used
USB 1.1 #4
USB 2.0 #2
Data 6P, 6N Rear panel quad USB stack Rear panel dual USB with RJ-45
Data 7P, 7N Rear panel quad USB stack Rear panel dual USB with RJ-45
USB 1.1 #5
USB 2.0 #2
Data 8P, 8N Front panel USB Front panel USB
Data 9P, 9N Front panel USB Front panel USB
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