Fast locking CDR for burst mode

摘要

A method relates generally to a receiver. In such a method, a check of a clock and data recovery block of the receiver for a metastable state is performed. A phase input to a phase interpolator of the receiver is changed to cause the clock and data recovery block of the receiver to exit the metastable state within a time limit. To check for the metastable state, a phase difference in received data is determined, and the phase difference is determined to be less than a threshold for the clock and data recovery block being in the metastable state.

主权项

1. A method for a receiver, comprising:
checking for a metastable state of a clock and data recovery block of the receiver; and changing a phase input to a phase interpolator of the receiver to cause the clock and data recovery block of the receiver to exit the metastable state within a time limit; wherein the checking comprises:
first determining a phase difference between a first phase value and a second phase value of received data, the first phase value and the second phase value being determined at different times; andsecond determining the phase difference being less than a threshold for the clock and data recovery block being in the metastable state.