Clock signal frequency verifying device and method

Abstract

The present invention, clock signal frequency verifying device and method are used in verification process of clock signal source. The device includes one reference clock signal and reset signal producing source, one frequency divider and one comparing detector. The method includes inputting a tested clock signal to the frequency divider; triggering the frequency divider corresponding to a activating reset signal to output a double-level frequency-dividing tested signal; detecting the signal level in a certain time internal; and judging whether the clock signal source is in normal operation state and finding out the period error range of the clock signal to be tested.

Description

technical field [0001] The invention relates to a clock signal frequency verification device and method, in particular to a clock signal frequency verification device and method used in the integrated circuit testing process. Background technique [0002] In today's various circuit devices, the clock signal is an important signal that is indispensable for coordinating the operation of various components. Therefore, in a test and verification procedure performed after a circuit device is manufactured, it must include the generation of the clock. A test verification action performed by a clock signal source of the signal. See figure 1 , which is a schematic block diagram of a commonly used test device for performing a test verification action on a clock signal source, which is mainly completed by a frequency divider 11 and a detection circuit 12, because the clock signal source 10 (usually an oscillator or a phase-locked The frequency of the clock signal generated by the loo...

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Problems solved by technology

However, it is obvious that the above-mentioned common means cannot effectively verify whether the frequency accuracy of the clock signal source 10 meets the requirements,

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