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User' s Manual
2.3.6
USB 2.0
The ICH4 contains an Enhanced Host Controller Interface (EHCI) compliant host
controller that supports USB high-speed signaling. High-speed USB 2.0 allows data
transfers up to 480Mb/s which is 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 USB ports are high-speed, full-speed, and
low-speed capable. ICH4' s port-routing logic determines whether a USB port is controlled
by one of the UHCI controllers or by the EHCI controller.
10 ECM-5716 Series User' s Manual
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