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Wa_english_title: "Enhanced Host Controller Interface Specification", Wa_rdcproducts: "rdcproducts:ioproducts", Wa_emtcontenttype: "emtcontenttype:datasheetsspecificationsandschematics/productspecification", Hardware prefetching: Allows host controller hardware to safely prefetch information from the asynchronous and periodic schedules beyond what was defined in previous EHCI implementations to improve system memory access behaviorĮnhanced Host Controller Interface specification for Universal Serial Bus addendum, version 1.1 ›.Shorter periodic frame list: Ability for system software to convey and use a much shorter periodic frame list (32 frames) to better facilitate hardware prefetching.Per-port change events: Addresses an issue where system software is currently required to read and parse the port status registers (PORTSC) for all enabled root ports upon every port-change event (interrupt) to streamline software’s handling of LPM transition.Link power management: Ability for software to discover and use USB 2.0 Link Power Management (LPM) support offered by next-generation host controllers and devices.The EHCI 1.1 addendum is intended to define several optional energy efficiency extensions for USB host controller implementations based on the EHCI specification, most notably: All current development should be targeting this revision of the specification.Įnhanced Host Controller Interface specification for Universal Serial Bus, version 1.0 › The complete Revision 1.0 download includes two files: The specification and a summary of the changes between Revisions 0.96 and 1.0.

Revision 1.0 can be downloaded from the link below. This revision is an editorial update from 0.96. The latest revision of the specification is Revision 1.0. All versions of the specification prior to the Revision 1.0 level (0.95 and 0.96) are licensed to allow the implementation of compliant, discrete EHCI host controllers only. Licensing of Revision 1.0 of the EHCI specification allows the implementation of both discrete- and integrated-compliant EHCI host controllers.