System and method for clock detection with glitch rejection
AssigneeBroadcom Corporation
InventorsRichard J. Evans, Martin G. Vickers, Simon T. Smith
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Abstract
A system and a method are presented for detecting the presence of at least one clock signal of a defined clock frequency applied to at least one input port of an integrated circuit system, wherein the a first number M of clock pulses related to the at least one clock signal within a predefined cycle period is counted and the counted first number M of clock pulses is compared with a reference number. Depending on the result of the comparison the presence of the at least one clock signal is detected or not.
Claims18
A method for detecting the presence of at least one clock signal of a defined clock frequency applied to at least one input port of an integrated circuit system, the method comprising the steps of:
- counting a first number M of clock pulses related to the at least one clock signal within a predefined cycle period based on a reference clock signal that is applied to an independent input port of the integrated circuit system;
- and
- comparing the counted first number M of clock pulses with at least one reference number, wherein depending on the result of the comparison the presence of the at least one clock signal is detected or not.
An integrated circuit system for detecting the presence of at least one clock signal of a defined clock frequency applied to at least one input port of said integrated circuit system, the system comprising:
- a counter unit for counting a first number of clock pulses related to the at least one clock signal within a predefined cycle period based on a reference clock signal that is applied to an independent input port of the integrated circuit system;
- and
- a comparison unit for comparing the first number of clock pulse with a reference number, wherein depending on the result of the comparison the presence of the at least one clock signal is detected or not.
Dependencies are inferred from the claim text.