Patent ID: 6785354
Filing Date: 2004-08-31
Classification: H03D,H03L,H04L,Y10S

Abstract:
A lock detection method comprisingreceiving, by a lock detection unit, a data signal and a clock signal, the data signal and the clock signal being in lock when a data transition occurs in the center of a first transition period, detecting for a data transition of the data signal in a first partial period centered around the center of the first transition period and generating a first output signal having a first logic value in response to the presence of a data transition in the first partial period and having a second logic value in response to the absence of a data transition in the first partial period, detecting for a data transition of the data signal in a second partial period centered around the center of an eye opening period and generating a second output signal having a first logic value in response to the absence of a data transition in the second partial period and having a second logic value in response to the presence of a data transition in the second partial period, and comparing the first and second output signals; and generating a lock signal according to the comparison.