Anti-Tamper Digital Clocks - An Overview
Anti-Tamper Digital Clocks - An Overview
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three. The method for detecting clock tampering as outlined in assert 1, wherein using the clock to cause the Appraise circuit comprises employing a clock edge at an conclusion on the clock Assess period of time to result in the Examine circuit.
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16. The apparatus for detecting clock tampering as defined in assert fifteen, whereby the resettable hold off line segments are reset during a reset time frame, wherein the reset time frame is ahead of the clock evaluate time period.
Resettable hold off line segments concerning a resettable delay line segment connected to a minimum delay time plus a resettable delay line section associated with a greatest hold off time are Every single linked to discretely expanding hold off times. The Examine circuit is induced with the clock here and takes advantage of the plurality of delayed monotone signals to detect a clock fault.
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The approach from the invention may well detect a lot quicker- and slower-than-predicted clock frequencies. Furthermore, it may well detect a setup-time violation of the monotone sign to perception more quickly than predicted frequencies or glitches. A considerable change in the volume of setup-time violations can be detected to offer an adaptive atmosphere insensitive sensor.
19. The apparatus for detecting clock tampering as outlined in declare eighteen, whereby the water amount amount is determined based upon delayed monotone alerts from one or more previous clock Assess time.
a plurality of resettable delay line segments that delay the monotone sign to produce a respective plurality of delayed monotone indicators Each individual obtaining possibly a a person or even a zero logic worth, wherein resettable delay line segments between a resettable delay line phase affiliated with a minimum delay time along with a resettable delay line section connected with a maximum hold off time are each affiliated with discretely expanding hold off moments; and
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The reset period of time could be just before the clock evaluate period of time 310. Utilizing the clock CLK to bring about the evaluate circuit 240 could utilize a clock edge at an finish of your clock Assess period of time to induce the evaluate circuit.