EHCI - Enhanced Host Controller Interface
The Enhanced Host Controller Interface (EHCI) specification describes the register-level interface for a Host Controller for the Universal Serial Bus (USB).
The EHCI specification describes a host controller that correctly supports all compliant USB 2.0 low-, full-, and high-speed devices. It includes a description of the hardware/software interface between system software and the host controller hardware. This specification is intended for hardware component designers, system builders and device driver developers.
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