PCI-E2.0 Specification

PCI-E2.0 SpecPCI Express® 2.0 Base Specification 40 1.3.5. PCI Express-PCI Bridge....................................................................................... 40 1.4. PCI EXPRESS FABRIC TOPOLOGY CONFIGURATION....................................................... 40 1.5. PCI EXPRESS LAYERING OVERVIEW....................... ....................................................... 41 1.5.1. Transaction Layer................................................................................................. 42 1.5.2. Data Link Layer .................................................................................................... 42 1.5.3. Physical Layer ...................................................................................................... 43 1.5.4. Layer Functions and Services............................................................................... 43 2. TRANSACTION LAYER SPECIFICATION ..................................................................... 47 2.1. TRANSACTION LAYER OVERVIEW.................................................................................. 47 2.1.1. Address Spaces, Transaction Types, and Usage................................................... 48 2.1.2. Packet Format Overview ...................................................................................... 50 2.2. TRANSACTION LAYER PROTOCOL - PACKET DEFINITION............................................... 52 2.2.1. Common Packet Header Fields ............................................................................ 52 2.2.2. TLPs with Data Payloads - Rules ......................................................................... 54 2.2.3. TLP Digest Rules .................................................................................................. 56 2.2.4. Routing and Addressing Rules.............................................................................. 57 2.2.5. First/Last DW Byte Enables Rules........................................................................ 60 2.2.6. Transaction Descriptor......................................................................................... 62 2.2.7. Memory, I/O, Configuration, and Trusted Configuration Request Rules............. 67 2.2.8. Message Request Rules......................................................................................... 70 2.2.9. Completion Rules.................................................................................................. 82 2.3. HANDLING OF RECEIVED TLPS...................................................................................... 84 2.3.1. Request Handling Rules........................................................................................ 87 ....................................................... 41 1.5.1. Transaction Layer................................................................................................. 42 1.5.2. Data Link Layer .................................................................................................... 42 1.5.3. Physical Layer ...................................................................................................... 43 1.5.4. Layer Functions and Services............................................................................... 43 2. TRANSACTION LAYER SPECIFICATION ..................................................................... 47 2.1. TRANSACTION LAYER OVERVIEW.................................................................................. 47 2.1.1. Address Spaces, Transaction Types, and Usage................................................... 48 2.1.2. Packet Format Overview ...................................................................................... 50 2.2. TRANSACTION LAYER PROTOCOL - PACKET DEFINITION............................................... 52 2.2.1. Common Packet Header Fields ............................................................................ 52 2.2.2. TLPs with Data Payloads - Rules ......................................................................... 54 2.2.3. TLP Digest Rules .................................................................................................. 56 2.2.4. Routing and Addressing Rules.............................................................................. 57 2.2.5. First/Last DW Byte Enables Rules........................................................................ 60 2.2.6. Transaction Descriptor......................................................................................... 62 2.2.7. Memory, I/O, Configuration, and Trusted Configuration Request Rules............. 67 2.2.8. Message Request Rules......................................................................................... 70 2.2.9. Completion Rules.................................................................................................. 82 2.3. HANDLING OF RECEIVED TLPS...................................................................................... 84 2.3.1. Request Handling Rules........................................................................................ 87