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Extensible Host Controller Interface (xHCI) Draft Specification for USB 3.0

Universal Serial Bus 3.0

The eXtented Host Controller Interface (xHCI) draft specification describes the register-level host controller interface for Universal Serial Bus (USB) Revision 2.0 and above. The specification 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 (software) developers. The reader is expected to be familiar with the current Universal Serial Bus Specification revisions. Note: In case of conflicts between the xHCI and the USB specifications, the USB specifications take precedence and must be followed.

The specification is primarily targeted to host controller developers and system OEMs, but provides valuable information for platform operating system and BIOS device driver developers, adapter IHVs/ISVs, and platform/adapter controller vendors. This specification can be used for developing new products and associated software.

How to become an xHCI contributor:

Thank you for your interest in becoming a contributor to the xHCI Specification. To become a contributor to the xHCI specification, please complete the steps listed below:

Step 1. Print and execute the xHCI Contributor agreement. Note: The agreement must be executed by a corporate officer.

Step 2. Fax a copy of the completed xHCI Contributors Agreement executed by a corporate officer to Jeff Ravencraft at 1-503-264-3483 or email an electronic copy to jeff.ravencraft@intel.com.

Step 3. Send two (2) original, signed copies of the xHCI Contributors Agreement by Fed-Ex Priority One to:

Intel Corporation
ATTN: Jeff Ravencraft
2111 NE 25th Ave.
M/S JF5-3-E7
Hillsboro, OR 97124
Tel: 1-503-696-8080

Step 4. After the above requirements have been met, your company will be sent a PDF electronic copy of the (draft) specification. It will be sent to the contact person noted in the Contributors agreement.