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详细说明： OBJECTIVE OF THE SPECIFICATION.................................................................................... 27 DOCUMENT ORGANIZATION ................................................................................................ 27 DOCUMENTATION CONVENTIONS...................................................................................... 28 TERMS AND ACRONYMS........................................................................................................ 29 REFERENCE DOCUMENTS.................................. .................................................................... 36 1. INTRODUCTION ................................................................................................................ 37 1.1. A THIRD GENERATION I/O INTERCONNECT ................................................................... 37 1.2. PCI EXPRESS LINK......................................................................................................... 39 1.3. PCI EXPRESS FABRIC TOPOLOGY .................................................................................. 41 1.3.1. Root Complex........................................................................................................ 41 1.3.2. Endpoints .............................................................................................................. 42 1.3.3. Switch.................................................................................................................... 45 1.3.4. Root Complex Event Collector.............................................................................. 46 1.3.5. PCI Express to PCI/PCI-X Bridge........................................................................ 46 1.4. PCI EXPRESS FABRIC TOPOLOGY CONFIGURATION....................................................... 46 1.5. PCI EXPRESS LAYERING OVERVIEW.............................................................................. 47 1.5.1. Transaction Layer................................................................................................. 48 1.5.2. Data Link Layer .................................................................................................... 48 1.5.3. Physical Layer ...................................................................................................... 49 1.5.4. Layer Functions and Services............................................................................... 49 2. TRANSACTION LAYER SPECIFICATION ..................................................................... 53 2.1. TRANSACTION LAYER OVERVIEW.................................................................................. 53 2.1.1. Address Spaces, Transaction Types, and Usage................................................... 54 2.1.2. Packet Format Overview ...................................................................................... 56 2.2. TRANSACTION LAYER PROTOCOL - PACKET DEFINITION............................................... 58 2.2.1. Common Packet Header Fields ............................................................................ 58 2.2.2. TLPs with Data Payloads - Rules ......................................................................... 61 2.2.3. TLP Digest Rules .................................................................................................. 65 2.2.4. Routing and Addressing Rules .............................................................................. 65 2.2.5. First/Last DW Byte Enables Rules........................................................................ 69 2.2.6. Transaction Descriptor......................................................................................... 71 2.2.7. Memory, I/O, and Configuration Request Rules................................................... 77 2.2.8. Message Request Rules......................................................................................... 83 2.2.9. Completion Rules.................................................................................................. 97 2.2.10. TLP Prefix Rules ................................................................................................. 100 2.3. HANDLING OF RECEIVED TLPS.................................................................................... 104 ...展开详情收缩
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