This document describes a Universal Host Controller Interface (UHCI) for a device that implements a Universal Serial Bus (USB) Host Controller. The document is intended for hardware vendors. The UHCI description covers the hardware/software interface between the Host Controller Software Driver and the Host Controller hardware (shaded area in Figure 1). It describes the register-level hardware interface to the USB Host Controller. Hardware developers may take advantage of the standard software drivers written to be compatible with this Universal Host Controller Interface by conforming to the register level interface and memory data structures described in this document.
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uhci11d.pdf
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