Method and apparatus for efficient fast retraining of ethernet transceivers
AssigneeMarvell Asia Pte Ltd
InventorsSeid Alireza Razavi Majomard, Hossein Sedarat, Dragan Labalo
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Abstract
A method of operation for an Ethernet transceiver is disclosed. The method includes entering a fast retrain sequence of steps. The fast retrain sequence of steps includes transferring two-level symbols to a link partner; and directly following transferring of the two-level symbols, transferring multi-level symbols to the link partner, the multi-level symbols having greater than two symbol levels.
Claims18
A method of operation for an Ethernet transceiver, the method comprising:
- entering a fast retrain sequence of steps, the fast retrain sequence of steps including
- transferring two-level symbols to a link partner without transferring Tomlinson-Harashima Precoder (THP) coefficient information;
- and
- directly following transferring of the two-level symbols, transferring multi-level symbols to the link partner, the multi-level symbols having greater than two symbol levels.
An integrated circuit (IC) Ethernet transceiver chip comprising:
- receiver circuitry including correlated noise canceller circuitry;
- and
- training logic to control a fast retrain sequence, the fast retrain sequence including
- a transfer of uncoded two-level symbols to a link partner;
- a transfer of coded two-level symbols to the link partner following the transfer of the uncoded two-level symbols without transferring Tomlinson-Harashima Precoder (THP) coefficient information;
- and
- directly following the transfer of the coded two-level symbols, the training logic to control a transfer of multi-level symbols to the link partner, the multi-level symbols having greater than two symbol levels.
A method of operation for an Ethernet transceiver, the method comprising:
- for a first mode of operation, performing a training sequence by
- transferring two-level symbols to a link partner;
- and
- directly following transferring of the two-level symbols, transferring multi-level symbols to the link partner, the multi-level symbols having greater than two symbol levels;
- and
- for a second mode of operation, performing the training sequence by
- transferring uncoded two-level symbols to a link partner;
- exchanging updated precoder coefficients with the link partner,
- transferring coded two-level symbols to the link partner, the coding consistent with the updated precoder coefficients, and
- transferring multi-level symbols to the link partner, the multi-level symbols encoded consistent with the exchanged updated precoder coefficients and having greater than two symbol levels.
Dependencies are inferred from the claim text.