PCI Express®: Performance Scalability for the Next Decade

	Download the Specifications (Members only) PCIe Base Spec 3.0 NEW PCIe Base Spec 2.1 PCIe CEM Spec 2.0 PCIe Base Spec 1.1  PCIe CEM Spec 1.1 PCIe Mini CEM Spec 2.0 NEW PCIe Mini CEM Spec 1.2    PCIe ExpressModule Electromechanical Spec 1.0 PCIe x16 Graphics 150W-ATX Spec 1.0 PCI Express Label Spec and Usage Guidelines  PCIe to PCI/PCI-X Bridge Spec 1.0 PCIe Mobile Graphics Low-Power Addenum 1.0 PCI Code and ID Assignment Spec Update ECN Accelerator Class Code ECN

PCI Express Specifications

PCI-SIG Members are entitled to review draft specifications and participate in the ECR/ECN process. PCI-SIG members may also download PCI Express specifications for free (see adjacent table), or purchase paper copies of PCI Express specifications at a lower cost.

Non-members who are interested in reviewing copies of the PCI Express specifications may submit a specification order form.

PCI Express 3.0 ECNs

Protocol & Software

• M-PCIe ECN (1.46MB PDF)
• L1 PM Substates with CLKREQ ECN Revision 1.0a (504k PDF)
• Precision Time Measurement ECN Revision 1.0a (418k PDF)
• Separate Refclk Independent SSC Architecture (SRIS) ECN (392k PDF)
• Change Root Complex Event Collector Class Code ECN (112k PDF)
• Enhanced DPC (eDPC) (816k PDF)
• Downstream Port Containment (DPC) ECN (474k PDF)
• Lightweight Notification (LN) Protocol ECN (432k PDF)
• 8.0 GT/s Receiver Impedance ECN (70k PDF)
• PASID Translation ECN (236k PDF)
• Process Address Space ID (PASID) ECN (216k PDF)
• End-End TLP Prefix Changes for RCs ECN (72k PDF)

PCI Express 3.0 Test Specifications

• PCI Express Architecture PHY Test Specification 3.0 (586k PDF)
• PCI Express Architecture Configuration Space Test Specification 3.0 (2.64 MB PDF)
• PCI Express Architecture Link/Transaction Layer Test Specification 3.0 (1.32 MB PDF)
• PCI Express Architecture Platform Init/Config 3.0 (3.75 MB PDF)

PCI Express 2.x ECNs

Protocol & Software

• Protocol Multiplexing ECN (299k PDF)
• Optimized Buffer Flush/Fill ECN (276k PDF)
• ASPM Optionality ECN (127k PDF)
• TLP Prefix ECN (230k PDF) 
• TLP Processing HInts ECN (146k PDF)
• Extended Tag Enable Default ECN (64k PDF)
• Latency Tolerance Reporting ECN (149k PDF)
• ID-Based Ordering ECN (171k PDF)
• Dynamic Power Allocation ECN (90k PDF)
• Multicast ECN (212k PDF)
• Internal Error Reporting ECN (207k PDF)
• Atomic Operations ECN (195k PDF)
• Resizable BAR ECN (154k PDF)
• Alternative Routing-ID Interpretation ECN (249k PDF) 

Electromechanical

• Combined Antenna Tuning/Coexistence Signal ECN (153k PDF)
• Ref Clk Delayed from CLKREQ# Assertion ECN (149k PDF)
• Second Wireless Disable Pin ECN (267k PDF)
• CEM Support Power ECN (37k PDF)
• Optimized Buffer Flush/Fill ECN (276k PDF)
• System Board Eye Height ECN (27k PDF) 

PCI Express 2.0 Test Specifications

• PCI Express Architecture Configuration Space Test Specification 2.0a (398k PDF) - without change bar
• PCI Express Architecture Configuration Space Test Specification 2.0a (401k PDF) - with change bar
• PCI Express Architecture PHY Test Specification 2.0 (121k PDF)
• PCI Express Architecture Configuration Space Test Specification 2.0 (345k PDF)
• PCI Express Architecture Link Layer Test Specification 2.0 (308k PDF)
• PCI Express Architecture Transaction Layer Test Specification 2.0 (168k PDF)

Errata

• PCI Express Base Specification 3.0 Errata (1.99MB PDF)
• PCI Express Base Specification 2.1 Errata (405k PDF)
• PCI Express Base Specification 1.1 Errata (268k PDF)

View the PCI Express 1.0a Specification and ECN archive.