Physical Layer Overview
Detailed Physical Layer Description
This section provides an overview of the Physical Layer. A detailed description of the Physical Layer can be found in the chapter entitled “Detailed Physical Layer Description” on page 681.
General
The Physical Layer establishes the physical communications (via link training) with the entity (i.e., the CA, switch, or router) on the opposite end of the link. This includes:
Maximum path width determination (1, 4, or 12 lanes; a lane is a serial data transmit/receive signal pair).
Maximum speed determination (currently, only 2.5Gb/s is supported).
Multi-lane deskew (to align the data on all lanes).
In addition, the Physical Layer:
Performs training of the physical link to sync up the transmitter ...
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