PCI Express
PCI Express的硬件协议 > 引腳

下表列出在邊緣連接器上的PCI Express卡兩側的導線。在印刷電路板（PCB）的焊接側為A側，並且組件側的B側。PRSNT1# 和PRSNT2# 引腳必須比其餘稍短，以確保熱插入卡完全插入。該WAKE# 引腳採用全電壓喚醒計算機，但必須拉高從備用電源，以表明該卡是能夠喚醒。
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 引腳 | B側 | A側 | 描述 |  | 引腳 | B側 | A側 | 描述 |
| 1 | +12 V | PRSNT1# | 必須連接到最遠PRSNT2# 引腳 |  | 50 | HSOp (8) | Reserved | 通道8傳輸數據，+和− |
| 2 | +12 V | +12 V |  |  | 51 | HSOn (8) | Ground | 通道8傳輸數據，+和− |
| 3 | +12 V | +12 V |  |  | 52 | Ground | HSIp (8) | 通道8接收數據，+和− |
| 4 | Ground | Ground |  |  | 53 | Ground | HSIn (8) | 通道8接收數據，+和− |
| 5 | SMCLK | TCK | SMBus和JTAG端口引腳 |  | 54 | HSOp (9) | Ground | 通道9傳輸數據，+和− |
| 6 | SMDAT | TDI | SMBus和JTAG端口引腳 |  | 55 | HSOn (9) | Ground | 通道9傳輸數據，+和− |
| 7 | Ground | TDO | SMBus和JTAG端口引腳 |  | 56 | Ground | HSIp (9) | 通道9接收數據，+和− |
| 8 | +3.3 V | TMS | SMBus和JTAG端口引腳 |  | 57 | Ground | HSIn (9) | 通道9接收數據，+和− |
| 9 | TRST# | +3.3 V | SMBus和JTAG端口引腳 |  | 58 | HSOp (10) | Ground | 通道10傳輸數據，+和− |
| 10 | +3.3 V aux | +3.3 V | 備用電源 |  | 59 | HSOn (10) | Ground | 通道10傳輸數據，+和− |
| 11 | WAKE# | PERST# | 鏈接激活；基本復位 |  | 60 | Ground | HSIp (10) | 通道10接收數據，+和− |
| Key notch | Key notch | Key notch | Key notch |  | 61 | Ground | HSIn (10) | 通道10接收數據，+和− |
| 12 | CLKREQ# | Ground | 要求運行的時鐘 |  | 62 | HSOp (11) | Ground | 通道11傳輸數據，+和− |
| 13 | Ground | REFCLK+ | 參考時鐘差分對 |  | 63 | HSOn (11) | Ground | 通道11傳輸數據，+和− |
| 14 | HSOp (0) | REFCLK− | 參考時鐘差分對 |  | 64 | Ground | HSIp (11) | 通道11接收數據，+和− |
| 15 | HSOn (0) | Ground |  |  | 65 | Ground | HSIn (11) | 通道11接收數據，+和− |
| 16 | Ground | HSIp (0) | 通道0接收數據，+和− |  | 66 | HSOp (12) | Ground | 通道12傳輸數據，+和− |
| 17 | PRSNT2# | HSIn (0) | 通道0接收數據，+和− |  | 67 | HSOn (12) | Ground | 通道12傳輸數據，+和− |
| 18 | Ground | Ground |  |  | 68 | Ground | HSIp (12) | 通道12接收數據，+和− |
| PCI Express ×1卡於引腳18結束 | PCI Express ×1卡於引腳18結束 | PCI Express ×1卡於引腳18結束 | PCI Express ×1卡於引腳18結束 |  | 69 | Ground | HSIn (12) | 通道12接收數據，+和− |
| 19 | HSOp (1) | Reserved | 通道1傳輸數據，+和− |  | 70 | HSOp (13) | Ground | 通道13傳輸數據，+和− |
| 20 | HSOn (1) | Ground | 通道1傳輸數據，+和− |  | 71 | HSOn (13) | Ground | 通道13傳輸數據，+和− |
| 21 | Ground | HSIp (1) | 通道1接收數據，+和− |  | 72 | Ground | HSIp (13) | 通道13接收數據，+和− |
| 22 | Ground | HSIn (1) | 通道1接收數據，+和− |  | 73 | Ground | HSIn (13) | 通道13接收數據，+和− |
| 23 | HSOp (2) | Ground | 通道2傳輸數據，+和− |  | 74 | HSOp (14) | Ground | 通道14傳輸數據，+和− |
| 24 | HSOn (2) | Ground | 通道2傳輸數據，+和− |  | 75 | HSOn (14) | Ground | 通道14傳輸數據，+和− |
| 25 | Ground | HSIp (2) | 通道2接收數據，+和− |  | 76 | Ground | HSIp (14) | 通道14接收數據，+和− |
| 26 | Ground | HSIn (2) | 通道2接收數據，+和− |  | 77 | Ground | HSIn (14) | 通道14接收數據，+和− |
| 27 | HSOp (3) | Ground | 通道3傳輸數據，+和− |  | 78 | HSOp (15) | Ground | 通道15傳輸數據，+和− |
| 28 | HSOn (3) | Ground | 通道3傳輸數據，+和− |  | 79 | HSOn (15) | Ground | 通道15傳輸數據，+和− |
| 29 | Ground | HSIp (3) | 通道3接收數據，+和− |  | 80 | Ground | HSIp (15) | 通道15接收數據，+和− |
| 30 | Reserved | HSIn (3) | 通道3接收數據，+和− |  | 81 | PRSNT2# | HSIn (15) | 通道15接收數據，+和− |
| 31 | PRSNT2# | Ground |  |  | 82 | Reserved | Ground |  |
| 32 | Ground | Reserved |  |  |  |  |  |  |
| PCI Express ×4卡於引腳32結束 | PCI Express ×4卡於引腳32結束 | PCI Express ×4卡於引腳32結束 | PCI Express ×4卡於引腳32結束 |  |  |  |  |  |
| 33 | HSOp (4) | Reserved | 通道4傳輸數據，+和− |  |  |  |  |  |
| 34 | HSOn (4) | Ground | 通道4傳輸數據，+和− |  |  |  |  |  |
| 35 | Ground | HSIp (4) | 通道4接收數據，+和− |  |  |  |  |  |
| 36 | Ground | HSIn (4) | 通道4接收數據，+和− |  |  |  |  |  |
| 37 | HSOp (5) | Ground | 通道5傳輸數據，+和− |  |  |  |  |  |
| 38 | HSOn (5) | Ground | 通道5傳輸數據，+和− |  |  |  |  |  |
| 39 | Ground | HSIp (5) | 通道5接收數據，+和− |  |  |  |  |  |
| 40 | Ground | HSIn (5) | 通道5接收數據，+和− |  |  |  |  |  |
| 41 | HSOp (6) | Ground | 通道6傳輸數據，+和− |  |  |  |  |  |
| 42 | HSOn (6) | Ground | 通道6傳輸數據，+和− |  |  |  |  |  |
| 43 | Ground | HSIp (6) | 通道6接收數據，+和− |  | 圖例 | 圖例 | 圖例 | 圖例 |
| 44 | Ground | HSIn (6) | 通道6接收數據，+和− |  | 接地引腳 | 接地引腳 | 零電壓基準 | 零電壓基準 |
| 45 | HSOp (7) | Ground | 通道7傳輸數據，+和− |  | 電源引腳 | 電源引腳 | 為PCIe卡供電 | 為PCIe卡供電 |
| 46 | HSOn (7) | Ground | 通道7傳輸數據，+和− |  | 輸出引腳 | 輸出引腳 | 從PCIe卡到主機板的信號 | 從PCIe卡到主機板的信號 |
| 47 | Ground | HSIp (7) | 通道7接收數據，+和− |  | 輸入引腳 | 輸入引腳 | 從主機板到PCIe卡的信號 | 從主機板到PCIe卡的信號 |
| 48 | PRSNT2# | HSIn (7) | 通道7接收數據，+和− |  | 漏極開路 | 漏極開路 | 可拉至低電平或感應到多個卡 | 可拉至低電平或感應到多個卡 |
| 49 | Ground | Ground |  |  | 檢測引腳 | 檢測引腳 | 卡連接在一起 | 卡連接在一起 |
| PCI Express ×8卡於引腳49結束 | PCI Express ×8卡於引腳49結束 | PCI Express ×8卡於引腳49結束 | PCI Express ×8卡於引腳49結束 |  | 備用 | 備用 | 目前沒有使用，不連接 | 目前沒有使用，不連接 |