4.2.1. Preamble, Start, and SFD Insertion
In the TX datapath the MAC appends an eight-byte preamble that begins with a Start byte (0xFB) to the client frame. If you turn on Enable link fault generation , this MAC module also incorporates the functions of the reconciliation sublayer.
The source of the preamble depends on whether you turn on the preamble pass-through feature by turning on Enable preamble passthrough in the Low Latency 100G Ethernet Intel FPGA IP parameter editor.
If the preamble pass-through feature is turned on, the client provides the eight-byte preamble (including Start byte) on the data bus. The client is responsible for providing the correct Start byte.
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