Clock data recovery (CDR) phase-work in a phase-interpolator-based transceiver system

摘要

At least one of a data interpolator (PI) code 306 or a crossing PI code 308 in a clock and data recovery (CDR) circuit 206 until one or more predetermined criteria are met Methods and apparatus for synchronously stepping on one are described. One exemplary method includes, generally, determining (502) that the condition is satisfied; Stepping (504) at least one of the data PI code (306) or the crossing PI code (308) for each cycle of the clock (302) in the CDR circuit (206) based on the determination; Stopping step 506 based on one or more criteria to generate a predetermined state of the data PI code 306 and the crossing PI code 308. The predetermined state may be a data PI code 306) and a crossing PI code (308); Receiving (508) a data stream (218); And performing (510) clock and data recovery on data stream 218 based on the offset between data PI code 306 and crossing PI code 308.;