USB3.2 速率

一直以来也没搞清楚USB 3.2的10Gbps的形式，一直以为是5Gbps*2lane。

翻看了下USB 3.2的协议，终于搞明白了。协议上是这么说的：

3.2.1 Physical Layer

The Gen X physical layer specifications are detailed in Chapter 6. The physical layer defines the PHY portion of a port and physical connection between a downstream facing port（on a host or hub）and the upstream facing port on a device. The Gen X physical connection is comprised of two differential data pairs(one transmit pat and one receive path) for each lane. Dual-lane support(Gen X x 2) is defined to enable two lane operation over the USB Type-C cable and connector.

传输速率分为Gen 1（5Gbps）和Gen 2（10Gbps），在Type-C接口上可以实现2lane同时传输，即Gen 1 x 2（10Gbps）和Gen 2 x 2（20Gbps）。

 

USB 3.2协议连接如下：

https://usb.org/document-library/usb-32-specification-released-september-22-2017-and-ecns