METHOD AND SYSTEM FOR RESYNCHRONIZING A PHASE-SHIFTED RECEIVED DATA STREAM WITH A MASTER CLOCK

摘要

A method and system in a data processing system for resynchronizing a received data stream (58) with a master clock (72) having a master clock frequency, wherein the received data stream (58) is clocked with a received data clock (56) that is out of phase with the master clock (72) by an arbitrary number of degrees. The master clock (72) and the received data clock (56) are compared (120, 204) at a frequency of a resynchronization clock for a predetermined number of times to produce comparison results (208). The resynchronization clock frequency may be less than the frequency of the master clock. The comparison results are analyzed to produce a relative phase indicator (134). In response to the relative phase indicator exceeding, or being less than, a phase shift threshold (136, 210), the received data stream is reclocked (144) at a rising (212) or falling edge (214) of the master clock (72) to produce a resynchronized data stream (88), wherein the resynchronized data stream (88) is synchronized with the master clock (72) and contains the data of the received data stream (58).