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Tuesday, October 10, 2006
PCI-SIG Releases PCI Express 2.0 Specification


PCI-SIG, the Special Interest Group responsible for the PCI Express industry-standard I/O architecture has made the release candidate (revision 0.9) of its PCI Express Base 2.0 specification available for review by member companies.

With work on this specification nearly complete, PCI-SIG assigned its technical workgroups to investigate and develop the scope for potential extensions of the PCI Express protocols to meet future requirements, such as improved dynamic power controls, optimized synchronization, coherency hints, and more efficient transaction ordering.

These enhancements will be evaluated for possible inclusion in a collection of incremental extensions to the PCI Express architecture intended to improve the range of design options available to emerging markets and computing models.

PCIe 2.0 Specifications

PCI-SIG has released the 0.9 version of the PCIe Base 2.0 specification for member review and comment. This specification extends the data rate of PCIe to 5GT/s in a manner compatible with the existing PCIe 1.1 specifications that support 2.5GT/s signaling. There are a number of improvements made to the protocol and software layers of the architecture?a product of more than three years of design experience by the PCI-SIG members. A companion Card Electromechanical (CEM) 2.0 specification is also currently in review at 0.5 by the PCI-SIG members.

I/O Virtualization and PCIe Cable Specifications

Continuing ongoing specification development, PCI-SIG working groups are completing the suite of specifications to enable I/O device virtualization and sharing. The draft Address Translation Services (ATS) 0.9 specification has been released for member review. The Single-Root and Multi-Root device sharing specifications are in various stages of development and will be released to members for review in the near future.

The PCIe Cable specification has been released to members at revision 0.9 for 60-day review. The new specification supports cables up to 10 meters in length running at 2.5 Gb/s. Cable assemblies have already been measured and validated by the workgroups. The specification will primarily be implemented in disaggregated I/O and backplane usage models. PCI-SIG has decoupled this specification from the PCIe 2.0 specification (5.0 GT/s) and anticipates the final version of the cable specification to be ready by year-end 2006.


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