The lowest layer of PCI Express is the Physical Layer. The main responsibility of this layer is sending and receiving of all data across the PCI Express link.
Physical Layer Model
On the transmit side of Physical Layer the information taken from Data Link Layer and converts the parallel data into serial data format, nothing but a parallel to serial conversion. In additional framing characters is added to indicate the starting and ending of the packet.
On the receive side of Physical Layer the incoming serial data from PCI Express link is converted into its original format such that parallel data and the added frames are removed and the packets are send back to Data Link Layer.
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Physical Layer Model
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