CLOCK DETECTION METHOD AND DEVICE

摘要

The present invention provides a method and apparatus for clock checking, in order to solve the problem of high resource occupation in existing clock checking methods. The method includes: a programmable device for performing frequency division on the source clock signal to obtain a reference clock signal (S101); the programmable device treating the source clock signal as a counting work clock to determine the counting value of rising edges and counting value of high levels of a clock signal being checked during each high level period out of N continuous high levels of the reference clock signal (S102), wherein N is a positive integer; and the programmable device determining whether the clock signal being checked is valid according to the magnitude relationship between the counting value of the high levels of the clock signal being checked during each high level period and a first expected value, as well as the magnitude relationship between the counting value of the rising edges and a second expected value (S103). The technical solution of the present invention occupies fewer resources and improves the reliability of clock checking; the frequency range of the clock signal being checked is relatively wide; and some influence of high frequency spikes of the clock signal being checked can be filtered.