PHY retraining

摘要

Embodiments enable quick PHY re-training when the link is restarted due an event such as EMI, for example. In particular, embodiments recognize that, in the case of such events as EMI, a substantial portion of the training process as prescribed in the standard can be bypassed during the link restart without affecting subsequent link performance. In particular, embodiments recognize that a substantial amount of previously learned link parameters may still be used after link restart, and thus eliminate the need to re-learn them thereby speeding up the link restart process. Further, embodiments recognize that the standard prescribed link start up procedure can be accelerated in the case of link restart by reducing standard prescribed periods for transitioning between states of the link start up process. Additionally, embodiments provide a mechanism that relies on the auxiliary bit (AUX) of LDPC coded user data frames to pre-emptively and dynamically notch out troublesome EMIs before they cause the link to fail.

主权项

1. A method for re-training a physical layer transceiver (PHY) coupled to a communications link, comprising:
identifying a re-training condition including examining filter coefficients of a decision feedback equalizer (DFE) of the PHY to determine whether an electromagnetic interference (EMI) event caused the re-training condition; determining responsive to the re-training condition a PHY state transition of the PHY from a user data sending state to a PHY training state, wherein determining the PHY state transition comprises choosing the PHY training state from a plurality of PHY training states of a PHY training sequence of PHY based on the determination of whether an EMI event caused the re-training condition; transitioning the PHY from the user data sending state to the PHY training state; and returning the PHY to the user data sending state when a receiver module of the PHY is returned to a normal condition or when a pre-determined timer expires.