Apparatus for monitoring abnormality of each clock driver input

Details Apparatus for monitoring abnormality of each clock driver input Apparatus for monitoring abnormality of each clock driver input

1994-01-25

1996-06-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By presence or absence pulse detection

327 7, 340657, 340658, 331 46, G01R 29027

Patent

active

055237088

ABSTRACT:
A method of monitoring abnormality of a clock driver in an electronic apparatus having a clock supply unit that supplies a clock signal and a plurality of function executing units to which the clock signal is inputted for executing prescribed functions at an identical clock, wherein each function executing unit is provided with a clock driver which, on the basis of the clock signal, oscillates internally to reproduce a clock signal, includes monitoring cut-off of an input clock signal and cut-off of an output clock signal of the clock driver, and outputting an alarm upon judging that the clock driver is abnormal in a case where the output clock signal has been cut off but the input clock signal has not. Alternatively, the method includes monitoring the phase of the input clock signal and the phase of the output clock signal of the clock driver, and outputting an alarm upon judging that the clock driver is abnormal in a case where the output clock signal has developed a phase shift, which is greater than a prescribed value, with respect to the input clock signal.

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