Revision 5.0, Version 1.0June 9, 2021
术语定义
x1, x2, x4, x8, x12, x16x1 refers to one PCI Express Lane of basic bandwidth. For example: x4 refers to a collection of four PCI Express Lanes and is typically read as by four.x1指单个通道(lane)，单个基本带宽。例如，x4指4条通道(lane)的集合，一般读作by four.
AIC, Add-In Card扩展卡A card that is plugged into a connector and mounted in a chassis slot.插在连接器上和安装于底板槽中的板卡。
AGP, Accelerated Graphics PortAccelerated Graphics Port, card legacy form factor that predates PCI Express.为视频卡和3D加速器设计的高级端口。早于PCIE的过时的卡form factor定义。AGP由Intel开发并于1997年8月推出，它引入了一个专用的点对点通道，允许图形控制器直接访问系统内存。
ATX, Advanced Technology eXtendedAdvanced Technology eXtended, a system board form factor. Refer to the ATX Specification.一种系统板form factor (计算机硬件或硬件组件尺寸，形状及物理规范)。参考ATX specification.
ATX-based form factorRefers to the form factor that does not exactly conform to the ATX specification, but uses the key features of ATX, such as the slot spacing, I/O panel definition, etc.指不完全符合ATX规范的系统板form factor, 但使用ATX规范关键特性，如插槽间距，I/O面板定义，等。
Auxiliary power connector辅助电源连接器An Add-in Card connector, other than the CEM slot connector, through which the Add-in Card receives a power rail. This specification defines these types of such connectors: 2x3 connector; 2x4 connector, 48VHPWR, and 12VHPWR.一个扩展卡连接器，不同于CEM(Card electromechanical)规范定义槽连接器，通过这个连接器扩展卡连接辅助电源轨。该标准中定义了几种类型的辅助电源连接器，包括2x3 connector; 2x4 connector, 48VHPWR, and 12VHPWR.
Auxiliary signals辅助信号Signals, some of which are defined in the PCI Express Base Specification, that are used in conjunction with PCI Express signaling. Some are necessary for basic PCI Express operation (e.g., reference clock and reset) while others provide ancillary capabilities (e.g., the SMBus signals). See also Sideband signaling.信号，其中一些是在PCI Express Base Specification中定义的，它们与PCI Express数据传输信号一起使用。其中一些是基本PCI Express操作所必需的(例如，参考时钟和复位信号)，而另一些则提供辅助功能(例如，SMBus信号)。参见边带信令。
Basic bandwidth基本带宽The signal capacity of a single PCI Express Lane. (e.g. 32.0 GT/sfor one PCI Express 5.0 Tx and one Rx differential pair).单条PCIE lane(通道)信号容量。(例如单条PCIE 5.0 lane，即一发送差分对和接收差分对，信号容量为32.0 GT/s. 发送差分对为32.0 GT/s，接收差分对为32.0 GT/s)GT/s, Gigatransfers per secondGb/s, Gigabits per second
例如PCIE 5.0 单通道(lane) 32 GT/s传输速率意味着单通道传输32 Gb/s的原始数据。考虑到128b/130b编码，则有效数据传输不到32 Gb/s。图中总带宽1024Gbps = 32Gbps x 16 x 2. 16 stands for 16 lanes, 2 stands for 1Tx + 1Rx = 2.CardAn Add-in Card that is plugged into a connector and mounted in a chassis slot.扩展卡
Card Interoperability扩展卡互操作性Ability to operate with a PCI Express card plugged into different Link width connectors, for example, plugging a x1 card into a x16 slot.PCI Express扩展卡可以插入不同连接(Link)宽度的连接器运行，例如，将x1卡插入x16插槽。
CEMCard Electromechanical扩展卡机械电气特性
Down-pluggingPlugging a larger Link mechanical width card into a smaller Link mechanical width connector, for example, plugging a x4 card into a x1 connector.(Support for down-pluggingis outside the scope of this specification).插入较大连接(Link)机械宽度的扩展卡至较小连接(Link)机械宽度的连接器。例如插入x4扩展卡至x1连接器。Down-plugging的支持内容不在本规范讨论范围内。
DUAL-SLOT card双槽扩展卡A card that plugs into a single edge connector - but whose volume occupies a total of two adjacent expansion slots.双槽扩展卡虽然也是插入单槽或者说单边缘连接器，但是其体积占据两相邻扩展槽总容积。
ECNEngineering Change Notice.工程更改通知
Evolutionary strategy演变策略A strategy to develop the PCI Express connector and card form factors within today’s chassis and system board form factor infrastructure constraints.基于最新的机箱和系统板form factor基础结构约束下开发PCI Express连接器和form factor的策略。
High bandwidth高带宽Supports a larger number of PCI Express Lanes, such as a x16 card or connector.支持更多数量的PCIE通道(lane)，如x16扩展卡或连接器。
Host主板或基板Typically, the motherboard or baseboard mounting the CEM Slot Connector. A riser card and connector are considered part of the host, by extension.通常指装配有CEM插槽连接器的主板或基板。扩展的竖板(服务器扩展板多样化)和连接器也被认为是主板的一部分。
Hot plug热插拔Hot insertion and/or hot removal of a card into an active backplane or system board as defined in PCI Express Base Specification.热(运行中)插拔扩展从或至有源背板或系统板。详细定义参考PCI Express Base Specification。Hot swap热插拔Insertion and/or removal of a card into a passive backplane. The card must satisfy specific requirements to support hot swap.热(运行中)插拔扩展从或至无源背板或系统板。扩展卡必须满足特定的要求以支持hot swap(热插拔)。Hot plug and hot swapHot plug受控的热插拔。尽管支持服务器运行中插拔，但是在动作之前需要通知系统(软件)。Hot swap热插拔没有标准，它是系统相关的，通常由系统供应商实现。允许在不通知系统(软件)情况下，插入或拔出，从或至运行中服务器。或者说支持意外，不受控情况下的服务器运行中扩展卡的插拔。Active backplane相对于passive backplane意味着受控热插拔时有源器件或单元的支持。
Lane通道A differential Tx and Rx pair carrying PCI Express high-speed data.传输PCIE高速数据的一(发送差分对和接收差分对)。Link连接A collection of one or more PCI Express Lanes.一条或多条PCIE通道(lane)的集合。Lane and Link
Low profile card低外形尺寸扩展卡An Add-in Card whose height is no more than 68.90 mm (2.713 inches).高度低于68.90mm的扩展卡。
Managed Hot Plug受控热插拔Add-in Card insertion or removal (Hot Plug) with explicit advanced chassis or Host level slot power switching to ensure card insertion and removal in an Unpowered slot. Managed Hot Plug has no reliance on “first-break” connector contacts.受控热插拔在插拔之前通知系统(软件)，之后这些先进的能够开关插槽电源的主机或主板，关闭插槽电源，保证扩展卡插拔时插槽不供电，或者说保证扩展卡插拔时扩展卡不被供电。受控热插拔不依赖首先断开检测(first-break)连接器触点。
microATXAn ATX-based system board form factor. Refer to the microATX Motherboard Interface Specification.其中一种不完全符合ATX规范的系统板form factor, 但使用ATX规范关键特性，如插槽间距，I/O面板定义，等。详细定义参见 microATX Motherboard Interface Specification.
OBFFOptimized Buffer Flush/Fill.优化的缓存刷新和填充。一种功耗管理机制，可以节能。
PCI Express connectorPCIE连接器The card edge connector that accepts the CEM Add-in Card, typically mounted on the Host board or a riser card.配对CEM扩展卡的边缘连接器，通常装配于主板或扩展竖板。
REFCLK参考时钟The reference clock differential pair consisting of auxiliary signals REFCLK+ and REFCLK-.参考时钟差分对包含辅助信号REFCLK+和REFCLK-。
Riser扩展PCBA PCB that mounts PCI Express CEM Slot Connectors and permits one or more Add-in Cards to connect to the Host through a single, separate connector.装配有PCIE CEM插槽连接器的扩展PCB，允许一个或多个扩展卡通过单一的，单独的连接器连接到主机。
Sentry via接地防护过孔Additional ground via located adjacent to Auxiliary and Reserved signal pins in the through-hole connector footprint, intended to improve signal integrity.通孔连接器PCB封装相邻辅助和保留信号引脚间附加的接地拼接过孔，旨在提高信号完整性。
SINGLE-SLOT card单槽扩展卡A card that uses a single expansion slot.单槽扩展卡其体积仅占据单个扩展槽容积。
Sideband signaling边带信号传输法A method for signaling events and conditions using physical signals separate from signals forming the Link between two components. See also auxiliary signals.独立于形成连接(link)的两组件数据信号外使用物理信号发送事件和条件的方法。参见辅助信号。
Standard height card标准高度扩展卡An Add-in Card whose maximum height is no more than 111.28 mm (4.381 inches).最大高度不大于111.28mm的扩展卡。
TIMThermal Interface Materials热界面材料
TRIPLE-SLOT card三槽扩展卡A card that plugs into a single edge connector - but whose volume occupies a total of three adjacent expansion slots.三槽扩展卡虽然也是插入单槽或者说单边缘连接器，但是其体积占据三相邻扩展槽总容积。
TTPThermal Transfer Plate热传递平板
Unmanaged Hot Plug不受管理或不受控热插拔Add-in Card insertion or removal (Hot Plug) that relies on shorter “first-break” connector contacts to trigger slot power switching at a chassis or Host level, to ensure card removal in an unpowered slot. Unmanaged Hot Plug is not permitted in the 5.0 Revision.扩展卡插入或拔出(热插拔)依靠尺寸较短的首先断开检测(first-break)连接器触点来触发主机或主板的插槽电源切断，以确保在无电源插槽中扩展卡的拔出。5.0版本不支持非受控热插拔。
Up-pluggingPlugging a smaller Link mechanical width card into a larger Link mechanical width connector, for example, plugging a x1 card into a x4 connector.插入较小连接(Link)机械宽度的扩展卡至较大连接(Link)机械宽度的连接器。例如插入x1扩展卡至x4连接器。
WakeupA mechanism used by a component to request the reapplication of main power when in the L2 Link state. Two such mechanisms are defined in the PCI Express Base Specification: Beacon and WAKE#. This specification requires the use of WAKE# on any Add-in Card or system board that supports wakeup functionality.当组件处于L2连接状态时，请求重新施加主电源的一种机制。在PCI Express基本规范中定义了两种这样的机制:Beacon(信标)和wake#(唤醒)。本规范要求在任何支持唤醒功能的扩展卡或系统板上使用WAKE#。L2为PCIE连接电源功耗管理状态之一，L2为低功耗休眠状态，该状态下所有时钟及主电源关闭。