Training Sequence - 2.7 English

1G/10G/25G Switching Ethernet Subsystem Product Guide (PG292)

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2.7 English

The training sequence consists of a pseudo-random bit sequence (PRBS) of 4,094 bits followed by two zeros, for a total of 4,096 bits. The PRBS is transmitted at the line rate of 10.3125 or 25.78125 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 required. The PRBS generator is implemented with a circuit which corresponds to the following polynomial:

G(x) = 1 + x9 + x11