HP dc7800 manual Universal Serial Bus Interface, USB Connector, ICH9 USB Port Mapping

Input/Output Interfaces

5.8Universal 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 externally-accessible USB ports, two front panel USB ports (which may be disabled) and six USB ports on the rear panel. In addition, the SFF and CMT form factors support a media reader accessory that uses two USB ports through a system board connection.

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 5-7 shows the mapping of the USB ports.

USB

Table 5-7.

ICH9 USB Port Mapping

ICH9		USB Connector Location
Controller	Signals	USDT, SFF Form Factors	CMT Form Factor
USB 1.1 #1,	Data 0P, 0N	System board header P150	Rear panel dual USB stack w/RJ-45
USB 2.0 #1
	Data 1P, 1N	System board header P150	Rear panel dual USB stack w/RJ-45
USB 1.1 #2	Data 2P, 2N	Front panel USB	Rear panel quad USB stack
USB 2.0 #1
	Data 3P, 3N	Front panel USB	Rear panel quad USB stack
USB 1.1 #3	Data 4P, 4N	Not used	Rear panel quad USB stack
USB 2.0 #1
	Data 5P, 5N	Not used	Rear panel quad USB stack
USB 1.1 #4	Data 6P, 6N	Rear panel quad USB stack	system board header P150
USB 2.0 #2
	Data 7P, 7N	Rear panel quad USB stack	system board header P150
USB 1.1 #5	Data 8P, 8N	Rear panel quad USB stack	Front panel USB
USB 2.0 #2
	Data 9P, 9N	Rear panel quad USB stack	Front panel USB
USB 1.1 #6	Data 10P, 10N	Rear panel dual USB stack w/RJ-45	Not used
USB 2.0 #2
	Data 11P, 11N	Rear panel dual USB stack w/RJ-45	Not used

5.8.1 USB Connector

These systems provide type-A USB ports as shown in Figure 5-7.

1 2 3 4

Figure 5-8. Universal Serial Bus Connector (as viewed from rear of chassis)

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