Universal Serial Bus Interface - HP Compaq dc7600 MT Technical Reference Manual

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.
As shown in Figure 5-8, the USB interface is provided by the 82801 component. All systems
provide as total of eight USB ports, two USB ports accessible at the front of the unit 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.
USB 1.1
Cntlr. #1
USB 1.1
Cntlr. #2
USB 1.1
Cntlr. #3
USB 1.1
Cntlr. #4
USB 2.0
Cntlr.
Figure 5-8. USB I/F, Block Diagram
Technical Reference Guide
82801 ICH8
1.1 0
1.1 1
1.1 2
1.1 3
1.1 4
1.1 5
1.1 6
1.1 7
2.0 0
2.0 1
2.0 2
2.0 3
2.0 4
2.0 5
2.0 6
2.0 7
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Input/Output Interfaces
Rear Panel
Data 0
USB Port 1
Data 1
USB Port 2
Data 2
USB Port 3
Data 3
USB Port 4
Data 4
USB Port 5
Data 5
USB Port 6
Front Panel
Data 6
USB Port 7
Data 7
USB Port 8
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