Intel Corp. on Wednesday said that it had made available the Extensible Host Controller Interface (xHCI) draft specification revision 0.9 in support of the USB 3.0 architecture, also known as SuperSpeed USB. The xHCI draft specification provides a standardized method for USB 3.0 host controllers to communicate with the USB 3.0 software stack.

This specification describes the registers and data structures used to interface between system software and the hardware, and are developed to be compatible with the USB 3.0 specification being developed by the USB 3.0 Promoter Group. The Intel xHCI draft specification revision 0.9 is being made available under RAND-Z (royalty free) licensing terms to all USB 3.0 Promoter Group and contributor companies that sign an xHCI contributor agreement.

“The future of computing and consumer devices is increasingly visual and bandwidth intensive. Lifestyles filled with HD media and digital audio demand quick and universal data transfer. USB 3.0 is an answer to the future bandwidth need of the PC platform. AMD believes strongly in open industry standards, and therefore is supporting a common xHCI specification,” said Phil Eisler, AMD corporate vice president and general manager of the chipset business unit.

Intel plans to make available a revised xHCI 0.95 specification in the fourth quarter. The updated revision of the specification will also be released under RAND-Z licensing terms via an xHCI adopter's agreement.

Interoperability among devices from multiple manufacturers is important for consumer adoption of SuperSpeed USB products. The Intel xHCI draft specification revision 0.9 supports compatibility among various implementations of USB devices and will make it easier to develop software support for the industry.