Specifications

PCI-SIG specifications define standards driving the industry-wide compatibility of peripheral component interconnects. Members regularly review them, providing commentary and change requests when necessary. These requests are considered by technical workgroups and applied as appropriate, resulting in collaboratively devised specifications benefiting millions of platforms and add-in devices.

PCI-SIG members may submit requests to change specifications here. The Engineering Change Request process and form can be found here

PCI-SIG members may access specifications online, at no cost, using the Specification Library. Members may filter their search by technology type, revision, and the type of document. Select the appropriate filters and then select the Filter button to initiate your search. Alternatively, members may purchase a hard copy of the specifications, at a reduced member rate, here.

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Specifications Library

Technology: PCI Express
Specification Title Spec Rev Document Type Release Date
Errata for the PCI Express® Base Specification Revision 4.0 4.x Errata
Root Complex Event Collector Bus Number Association ECN
This ECN enhances Root Complex Event Collectors (RCE...view more This ECN enhances Root Complex Event Collectors (RCECs) to allow them to be associated with Devices located on additional Bus numbers. show less
4.x ECN
Address Translation Relaxed Ordering ECN
This ECN allows Address Translation Requests and Com...view more This ECN allows Address Translation Requests and Completions to support the Relaxed Ordering bit, where are currently defined to be Reserved for these types of TLPs. The proposal preserves interoperability with older Translation Agents. show less
4.x ECN
PCIe Link Activation ECN
Link Activation allows software to temporarily disab...view more Link Activation allows software to temporarily disable Link power management, enabling the avoidance of the architecturally mandated stall for software-initiated L1 Substate exits. show less
4.x ECN
PCI Express® Base Specification Revision 4.0, Version 1.0
This specification describes the PCI Express® archit...view more This specification describes the PCI Express® architecture, interconnect attributes, fabric management, and the programming interface required to design and build systems and peripherals that are compliant with the PCI Express Specification. show less
4.x Specification
PCI Express® Base Specification Revision 4.0, Version 1.0 (Change Bar)
This specification describes the PCI Express® archit...view more This specification describes the PCI Express® architecture, interconnect attributes, fabric management, and the programming interface required to design and build systems and peripherals that are compliant with the PCI Express Specification. show less
4.x Specification
Expansion ROM Validation ECN
Provide an optional mechanism to indicate to softwar...view more Provide an optional mechanism to indicate to software the results of a hardware validation of Expansion ROM contents. show less
4.x ECN