PCI Express的配置空间结构图如下图所示，为了能够快速定位相关寄存器的描述在PCIe Spec中的位置，整理了一个表格，顺便分享到我的博客上。
注：这个表格是基于PCIe Spec V2.0的，也就是Gen2的Spec正式版。其中有很多空白的地方，只是在Gen2中没有明确定义，但是在Gen3/Gen4可能会被用到的。具体以Spec为准，
| Code Name | Structure Name | Description | Location (Spec V2.0) |
| Header | |||
| N/A | Type 0 Header | First 64 bytes of non-bridge function | p432 |
| N/A | Type 1 Header | First 64 bytes of bridge function | P434 |
| PCI Capability Structures (CAP) | |||
| CAP01 | Power Management Capability Structure | Power management related regs | P438 |
| CAP02 | AGP Capability Structure | ||
| CAP03 | Vital Product Data Capability Structure | ||
| CAP04 | Slot Numbering Capability Structure | ||
| CAP05 | MSI Capability Structure | ||
| CAP06 | |||
| CAP07 | PCI-X Capability Structure | ||
| CAP08 | Hyper Transport Capability Structure | ||
| CAP09 | Vendor Specific Capability Structure | ||
| CAP0A | |||
| CAP0B | |||
| CAP0C | |||
| CAP0D | PCI Bridge Subsystem Vendor ID | ||
| CAP0E | |||
| CAP0F | |||
| CAP10 | PCI Express Capability Structure | Access to all PCIe capability and control regs | p440 |
| CAP11 | MSI-X Capability Structure | ||
| CAP12 | SATA Data/Index Configuration | ||
| CAP13 | Advanced Features Capability Structure | ||
| CAP14 | Enhanced Allocation Capability Structure | ||
| CAP15 | Flattening Portal Bridge Capability Stru. | ||
| PCI Express Extended Capability Structures (ECAP) | |||
| 0000 | Null Capability Structure | Next capability offset | |
| 0001 | AER Capability Structure | Advanced Error Reporting | p495 |
| 0002 | Virtual Channel Capability Structure | Virtual Channel & Traffic Class related regs | p510 |
| 0003 | Device Serial Number Capability Stru. | Provides a globally unique ID for this device | p525 |
| 0004 | |||
| 0005 | RC Link Declaration Capability Structure | Declare a RC’s internal topology | p527 |
| 0006 | RC Internal Link Control Capability Stru. | Status and control regs for RC’s internal link | p535 |
| 0007 | RC Event Collector Endpoint Association | p551 | |
| 0008 | Multi-Function VC Capability Structure | MFVC related regs | p552 |
| 0009 | |||
| 000A | RC Registers Block Header | RCRB related regs | p568 |
| 000B | Vendor-Specific Capability Structure | Holds vendor-defined information | p565 |
| 000C | |||
| 000D | Access Control Services Capability Stru. | ACS related regs | p545 |
| 000E | |||
| 000F | |||
| 0010 | |||
| 0011 | |||
| 0012 | |||
| 0013 | |||
| 0014 | |||
| 0015 | |||
| 0016 | |||
| 0017 | |||
| 0018 | |||
| 0019 | |||
| 001A | |||
| 001B | |||
| 001C | |||
| 001D | |||
| 001E | |||
| 001F | |||
| 0020 | |||
| 0021 | |||
| 0022 | |||
| 0023 | |||
| 0024 | |||
| 0025 | |||
| 0026 | |||
| 0027 | |||
| 0028 | |||
| 0029 |
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