Apparatus for detecting clock failure and method therefor

Details Apparatus for detecting clock failure and method therefor Apparatus for detecting clock failure and method therefor

2011-04-12

2011-04-12

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By presence or absence pulse detection

Reexamination Certificate

active

07924061

ABSTRACT:
A clock failure detection circuit comprises clock failure detection logic having a clock input providing an input clock signal, a counter and a reference clock input providing a reference clock signal to the counter for counting a number of reference clock cycles. The counter comprises a reset input arranged to receive successive reset pulses generated by at least one clock edge of the input clock signal to reset a counter value of the counter. The counter value before reset is used to identify a clock frequency error. A method of detecting a clock failure is also described. By using a counter value based on the reference clock cycles, and a reset trigger based on a clock edge of the input signal, it is possible to identify a clock frequency error in a much shorter time.

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Notice of Allowance dated Oct. 18, 2010 in U.S. Appl. No. 12/294,799.

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