常见的PCIe接口形态介绍
1 简介
PCIe在电路设计中的应用十分广泛，其接口类型也比较多样化。常见的PCIe形态包含以下几种：
2 AIC形态
- 插槽
PCIe AIC（Add-in-Card）这种形态的PCIe接口相信很多的朋友都见过，没错就是常出现在电脑主板上的接口，用于连接显卡、无线网卡、存储设备等。比较常见是PCIe x1、PCIe x4、PCIe x8、PCIe x16、PCIe x32。
- 金手指
该插槽对应的插卡形式为金手指，这种工艺来源于沉金工艺，为了实现良好导电性，表面采用镀金形式。PCB的TOP层和BUTTON层均可采用金手指的形式，用于连接更多的信号。
连接器我们按照PCIe x1、 PCIe x4、PCIe x8、PCIe x16。具体的内容见下：
- PCIe x1 PIN定义
| Pin | Side B Connector | Side A Connector |
|---|---|---|
| # | Name | Description |
| 1 | +12v | +12 volt power |
| 2 | +12v | +12 volt power |
| 3 | +12v | +12 volt power |
| 4 | GND | Ground |
| 5 | SMCLK | SMBus clock |
| 6 | SMDAT | SMBus data |
| 7 | GND | Ground |
| 8 | +3.3v | +3.3 volt power |
| 9 | JTAG1 | +TRST# |
| 10 | 3.3Vaux | 3.3v volt power |
| 11 | WAKE# | Link Reactivation |
| Mechanical Key | ||
| 12 | RSVD | Reserved |
| 13 | GND | Ground |
| 14 | HSOp(0) | Transmitter Lane 0,Differential pair |
| 15 | HSOn(0) | GND |
| 16 | GND | Ground |
| 17 | PRSNT#2 | Hotplug detect |
| 18 | GND | Ground |
- PCIe x4 PIN定义
| Pin | Side B Connector | Side A Connector |
|---|---|---|
| # | Name | Description |
| 1 | +12v | +12 volt power |
| 2 | +12v | +12 volt power |
| 3 | +12v | +12 volt power |
| 4 | GND | Ground |
| 5 | SMCLK | SMBus clock |
| 6 | SMDAT | SMBus data |
| 7 | GND | Ground |
| 8 | +3.3v | +3.3 volt power |
| 9 | JTAG1 | +TRST# |
| 10 | 3.3Vaux | 3.3v volt power |
| 11 | WAKE# | Link Reactivation |
| Mechanical Key | ||
| 12 | RSVD | Reserved |
| 13 | GND | Ground |
| 14 | HSOp(0) | Transmitter Lane 0,Differential pair |
| 15 | HSOn(0) | GND |
| 16 | GND | Ground |
| 17 | PRSNT#2 | Hotplug detect |
| 18 | GND | Ground |
| 19 | HSOp(1) | Transmitter Lane 1,Differential pair |
| 20 | HSOn(1) | GND |
| 21 | GND | Ground |
| 22 | GND | Ground |
| 23 | HSOp(2) | Transmitter Lane 2,Differential pair |
| 24 | HSOn(2) | GND |
| 25 | GND | Ground |
| 26 | GND | Ground |
| 27 | HSOp(3) | Transmitter Lane 3,Differential pair |
| 28 | HSOn(3) | GND |
| 29 | GND | Ground |
| 30 | RSVD | Reserved |
| 31 | PRSNT#2 | Hot plug detect |
| 32 | GND | Ground |
- PCIe x8 PIN定义
| Pin | Side B Connector | Side A Connector |
|---|---|---|
| # | Name | Description |
| 1 | +12v | +12 volt power |
| 2 | +12v | +12 volt power |
| 3 | +12v | +12 volt power |
| 4 | GND | Ground |
| 5 | SMCLK | SMBus clock |
| 6 | SMDAT | SMBus data |
| 7 | GND | Ground |
| 8 | +3.3v | +3.3 volt power |
| 9 | JTAG1 | +TRST# |
| 10 | 3.3Vaux | 3.3v volt power |
| 11 | WAKE# | Link Reactivation |
| Mechanical Keycard | ||
| 12 | RSVD | Reserved |
| 13 | GND | Ground |
| 14 | HSOp(0) | Transmitter Lane 0,Differential pair |
| 15 | HSOn(0) | GND |
| 16 | GND | Ground |
| 17 | PRSNT#2 | Hotplug detect |
| 18 | GND | Ground |
| 19 | HSOp(1) | Transmitter Lane 1,Differential pair |
| 20 | HSOn(1) | GND |
| 21 | GND | Ground |
| 22 | GND | Ground |
| 23 | HSOp(2) | Transmitter Lane 2,Differential pair |
| 24 | HSOn(2) | GND |
| 25 | GND | Ground |
| 26 | GND | Ground |
| 27 | HSOp(3) | Transmitter Lane 3,Differential pair |
| 28 | HSOn(3) | GND |
| 29 | GND | Ground |
| 30 | RSVD | Reserved |
| 31 | PRSNT#2 | Hot plug detect |
| 32 | GND | Ground |
| 33 | HSOp(4) | Transmitter Lane 4,Differential pair |
| 34 | HSOn(4) | GND |
| 35 | GND | Ground |
| 36 | GND | Ground |
| 37 | HSOp(5) | Transmitter Lane 5,Differential pair |
| 38 | HSOn(5) | GND |
| 39 | GND | Ground |
| 40 | GND | Ground |
| 41 | HSOp(6) | Transmitter Lane 6,Differential pair |
| 42 | HSOn(6) | GND |
| 43 | GND | Ground |
| 44 | GND | Ground |
| 45 | HSOp(7) | Transmitter Lane 7,Differential pair |
| 46 | HSOn(7) | GND |
| 47 | GND | Ground |
| 48 | PRSNT#2 | Hot plug detect |
| 49 | GND | Ground |
- PCIe x16 PIN定义
| Pin | Side B Connector | Side A Connector |
|---|---|---|
| # | Name | Description |
| 1 | +12v | +12 volt power |
| 2 | +12v | +12 volt power |
| 3 | +12v | +12 volt power |
| 4 | GND | Ground |
| 5 | SMCLK | SMBus clock |
| 6 | SMDAT | SMBus data |
| 7 | GND | Ground |
| 8 | +3.3v | +3.3 volt power |
| 9 | JTAG1 | +TRST# |
| 10 | 3.3Vaux | 3.3v volt power |
| 11 | WAKE# | Link Reactivation |
| Mechanical Key | ||
| 12 | RSVD | Reserved |
| 13 | GND | Ground |
| 14 | HSOp(0) | Transmitter Lane 0,Differential pair |
| 15 | HSOn(0) | GND |
| 16 | GND | Ground |
| 17 | PRSNT#2 | Hotplug detect |
| 18 | GND | Ground |
| 19 | HSOp(1) | Transmitter Lane 1,Differential pair |
| 20 | HSOn(1) | GND |
| 21 | GND | Ground |
| 22 | GND | Ground |
| 23 | HSOp(2) | Transmitter Lane 2,Differential pair |
| 24 | HSOn(2) | GND |
| 25 | GND | Ground |
| 26 | GND | Ground |
| 27 | HSOp(3) | Transmitter Lane 3,Differential pair |
| 28 | HSOn(3) | GND |
| 29 | GND | Ground |
| 30 | RSVD | Reserved |
| 31 | PRSNT#2 | Hot plug detect |
| 32 | GND | Ground |
| 33 | HSOp(4) | Transmitter Lane 4,Differential pair |
| 34 | HSOn(4) | GND |
| 35 | GND | Ground |
| 36 | GND | Ground |
| 37 | HSOp(5) | Transmitter Lane 5,Differential pair |
| 38 | HSOn(5) | GND |
| 39 | GND | Ground |
| 40 | GND | Ground |
| 41 | HSOp(6) | Transmitter Lane 6,Differential pair |
| 42 | HSOn(6) | GND |
| 43 | GND | Ground |
| 44 | GND | Ground |
| 45 | HSOp(7) | Transmitter Lane 7,Differential pair |
| 46 | HSOn(7) | GND |
| 47 | GND | Ground |
| 48 | PRSNT#2 | Hot plug detect |
| 49 | GND | Ground |
| 50 | HSOp(8) | Transmitter Lane 8,Differential pair |
| 51 | HSOn(8) | GND |
| 52 | GND | Ground |
| 53 | GND | Ground |
| 54 | HSOp(9) | Transmitter Lane 9,Differential pair |
| 55 | HSOn(9) | GND |
| 56 | GND | Ground |
| 57 | GND | Ground |
| 58 | HSOp(10) | Transmitter Lane 10,Differential pair |
| 59 | HSOn(10) | GND |
| 60 | GND | Ground |
| 61 | GND | Ground |
| 62 | HSOp(11) | Transmitter Lane 11,Differential pair |
| 63 | HSOn(11) | GND |
| 64 | GND | Ground |
| 65 | GND | Ground |
| 66 | HSOp(12) | Transmitter Lane 12,Differential pair |
| 67 | HSOn(12) | GND |
| 68 | GND | Ground |
| 69 | GND | Ground |
| 70 | HSOp(13) | Transmitter Lane 13,Differential pair |
| 71 | HSOn(13) | GND |
| 72 | GND | Ground |
| 73 | GND | Ground |
| 74 | HSOp(14) | Transmitter Lane 14,Differential pair |
| 75 | HSOn(14) | GND |
| 76 | GND | Ground |
| 77 | GND | Ground |
| 78 | HSOp(15) | Transmitter Lane 15,Differential pair |
| 79 | HSOn(15) | GND |
| 80 | GND | Ground |
| 81 | PRSNT#2 | Hot plug present detect |
| 82 | RSVD#2 | Hot Plug Detect |
3 OAM接口形态
OAM（Operations, Administration, and Maintenance）是OCP（Open Compute)定义的指导AI硬件加速模块和系统设计的标准，可以在服务器上实现更优的AI硬件加速模块的互联。OAM是一种基于PCIe接口的智能硬件，用于控制和管理计算机系统的运行和维护。
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