Patent ID: 7477713
Filing Date: 2009-01-13
Classification: H03L,H04L

Abstract:
1. A method comprising: monitoring trends of phase adjusts of signals from a phase rotator control of a clock-data-recovery circuit to a reference clock of a serial receiver, including utilizing an up-down counter and an adder to accumulate phase adjust data from the phase adjusts, wherein the phase adjusts include first rotate up and rotate down signals for phase rotation in the clock-data-recovery circuit; and adapting the phase adjusts to create future adjusts based on previous adjusts, including utilizing combinatorial logic to generate the future adjusts based on the accumulated phase adjust data and the previous adjusts, wherein the future adjusts include second rotate up and rotate down signals improving a rate of compensation for the frequency offsets by the phase adjusts, and wherein the first rotate up and rotate down signals and the second rotate up and rotate down signals are logically ORed to provide the phase adjusts to the reference clock.