Method and apparatus for data aided timing recovery in 10GBASE-T system

摘要

A method of data-aided timing recovery for Ethernet systems is disclosed. A first device negotiates a pseudorandom number sequence with a second device and receives a data signal from the second device. The first device samples the received data signal to recover a first training sequence. The first device also generates a second training sequence based on the pseudorandom number sequence. The second training sequence is then synchronized with the first training sequence. The synchronized second training sequence is used to align a receive clock signal of the first device with the data signal received from the second device.

主权项

1. A method of timing recovery performed by a first device, the method comprising:
negotiating a pseudorandom number sequence with a second device; sampling a data signal received from the second device to recover a first training sequence; generating a second training sequence based on the pseudorandom number sequence; synchronizing the second training sequence with the first training sequence by comparing the first training sequence with the second training sequence and iteratively adjusting the second training sequence based on the comparing, wherein comparing the first training sequence with the second training sequence comprises:
determining a peak correlation between the first training sequence and the second training sequence by comparing each bit of the first training sequence with two or more bits of the second training sequence over a threshold number of data cycles, wherein the peak correlation is based on a number of matching bits within the first training sequence and the second training sequence and further based on a degree of variation between adjacent bits of the pseudorandom number sequence; and aligning a receive clock signal of the first device with the received data signal using the synchronized second training sequence.