M.2卡Key B ECN：实现PCIe与USB 3.1 Gen1双接口

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标题：“PCIe和USB 3.1 Gen1在M.2卡插槽B ECN的启用” 描述：此工程变更通知（ECN）主要关注的是如何在M.2 Card Key B（通常用于无线广域网，WWAN）上同时支持PCI Express (PCIe) 和 USB 3.1 Gen1。日期为2017年2月10日，影响的文档是PCI Express M.2规范版本1.1。由Jim Panian, Qualcomm Technologies Inc.发起。变更内容详解： 1. 功能性变化概述：原有的M.2 Key B设计现在允许同时呈现PCIe和USB 3.1 Gen1信号，这意味着一块支持这两种接口的单个M.2卡可以在一个插槽上使用。这是通过重新定义Socket 2 Add-in Card Configuration Table中的状态来实现的。状态#14被重新定义，表明插槽支持符合PCI Express M.2规范1.1或更高版本的插卡，其中包含PCIe和USB 3.1 Gen1接口。连接器上的端口配置由制造商自行定义，以确保主机清晰识别出这两种接口的存在。 2. 状态#4、5、6和7的改动：这些状态之前仅表示USB 3.1 Gen1接口，但现在它们也被重新定义，允许在保持USB 3.1 Gen1的同时，额外支持PCIe。这种改动适用于根据PCI Express M.2规范1.0构建的M.2卡，这意味着这些卡现在可以更灵活地支持两种高速接口。这项变更的意义在于，对于那些需要高效数据传输和连接性的系统设计者而言，M.2 Card Key B现在可以作为一个多功能接口，既可用于PCIe的高速数据交换，又可提供USB 3.1 Gen1的通用性，提升系统的扩展性和兼容性。这对于云计算、数据中心设备、工业物联网等领域具有实际的应用价值，因为它们可能需要整合多种功能在一个紧凑的M.2插槽上。同时，这也可能引发相应的驱动程序和硬件兼容性检查，以确保所有设备都能无缝协同工作。

Page 1

PCI-SIG ENGINEERING CHANGE NOTICE

TITLE:

Enable PCIe and USB 3.1 Gen1 on M.2 Card Key B

DATE:

February 10, 2017

AFFECTED DOCUMENT:

PCI Express M.2 Specification, Revision 1.1

SPONSOR:

Jim Panian, Qualcomm Technologies Inc.

Part I

1. Summary of the Functional Changes

M.2 Key B (WWAN) is modified to enable PCIe and USB 3.1 Gen1 signals to be simultaneously present

on the connector. This enables support for a single SKU M.2 card that supports both PCIe and USB 3.1

Gen1. There are two implementation options enabled:

1. State #14 in the “Socket 2 Add-in Card Configuration Table” is re-defined to indicate an Add-in

Card built to the PCI Express M.2 Specification, Revision 1.1 or later where both PCIe and USB

3.1 Gen1 are both present on the connector. The choice of Port Configuration is vendor defined.

This enables the host to unambiguously determine that PCIe and USB 3.1 Gen1 are present on

the connector.

2. States #4, 5, 6, 7 in the “Socket 2 Add-in Card Configuration Table” are re-defined to indicate

that in addition to USB 3.1 Gen1, PCIe may be present on the connector. This definition was

used by M.2 cards built to the PCI Express M.2 Specification, Revision 1.0 (USB 3.1 Gen1 on

connector; PCIe is “no connect”). This definition is now also permitted to be used by M.2 cards

built to PCI Express M.2 Specification, Revision 1.1 or later to indicate that PCIe and USB 3.1

Gen1 are both present on the connector. This allows GPIO port configurations to remain

consistent with all other existing states.

2. Benefits as a Result of the Changes

An M.2 card as a single SKU may be designed for insertion into a:

• Host system that only supports PCIe

• Host system that only supports USB 3.1 Gen1

• Host system that supports PCIe and/or USB 3.1 Gen1

3. Assessment of the Impact

This feature is optional. It will have no impact on existing M.2 card implementations. Existing M.2

platforms may not support the PCIe interface on newer cards advertising States 4-7. Existing M.2

platforms may not support newer cards advertising State 14.

4. Analysis of the Hardware Implications

Hardware changes are required to take advantage of this new optional capability.

5. Analysis of the Software Implications

None.

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