LOW POWER AND AREA CLOCK MONITORING CIRCUIT USING RING DELAY ARRANGEMENT FOR CLOCK SIGNAL HAVING PHASE-TO-PHASE VARIATION
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United States of America Patent
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Oct 10, 2024
app pub date -
Apr 4, 2023
filing date -
Apr 4, 2023
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Abstract
Circuitry and method of operating a circuit for monitoring a clock signal having phase-to-phase variation is disclosed. The method comprises adding a fixed number of bits to a pulse count of a reference phase instance for a high or low phase to yield a modified added pulse count when detecting a clock slow abnormality, subtracting the fixed number of bits from the pulse count of the reference phase instance to yield a modified subtracted pulse count when detecting a clock fast abnormality, comparing the modified added pulse count to a pulse count for an immediately subsequent phase instance of the high or low phase count of the clock signal when detecting the clock slow abnormality, and comparing the modified subtracted pulse count to the pulse count for the immediately subsequent phase instance of the high phase or low phase count of the clock signal when detecting the clock fast abnormality.
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