Short for 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.
Intel EHCI Specification for Universal Serial Bus Implementation of the Enhanced Host Controller Interface Specification requires a license from Intel. Adopters of the Enhanced Host Controller Interface Specification for USB have signed the Enhanced Host Controller Interface Specification for USB - Adopters Agreement in order to be licensed to use and implement this Specification.
Linux Journal: An Overview of Linux USB Learn some of the basics of the USB subsystem, including how URBs work and what kind of host controllers are available.
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