Training Sequence - 3.1 English

UltraScale+ Devices Integrated 100G Ethernet Subsystem Product Guide (PG203)

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3.1 English

The training sequence consists of a Pseudo Random Bit Sequence (PRBS) of 4094 bits followed by two 0s, for a total of 4096 bits. The PRBS is transmitted at the line rate of 10.3125 Gb/s. The PRBS generator receives an 11-bit seed from an external source. Subsequent to the initial seed being loaded, the PRBS generator continues to run with no further intervention being required.

The PRBS generator itself is implemented with a circuit that corresponds to this polynomial:

G(x) = 1 + x9 +  x11