Intel® 82801DB I/O Controller Hub 4 (ICH4) Whitepaper
The Intel® 82801DB I/O Controller Hub 4 (ICH4) contains an Enhanced Host Controller Interface (EHCI) compliant host controller which supports USB high-speed signaling. Hi-speed USB 2.0 allows data transfers up to 480 Mb/s - 40 times faster than full-speed USB. The ICH4 also contains three Universal Host Controller Interface (UHCI) controllers that support USB full-speed and low-speed signaling.
The ICH4 supports 6 USB 2.0 ports. All six ports are high-speed, full-speed, and low-speed capable. ICH4s port-routing logic determines whether a USB port is controlled by one of the UHCI controllers or by the EHCI controller.
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