Anti-Tamper Digital Clocks No Further a Mystery



a 2nd circuit that gives a 2nd monotone sign all through a 2nd clock Examine period of time connected with the clock, wherein the second clock Assess time frame covers another time than the primary clock Examine time frame;

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The reset time period might be before the Examine time period. Utilizing the clock to set off the Examine circuit may perhaps use a clock edge at an conclude of your Appraise time period to bring about the evaluate circuit.

twenty five. The method for detecting voltage tampering as outlined in declare 23, wherein using the clock to result in the evaluate circuit comprises employing a clock edge at an close in the Consider time frame to bring about the Assess circuit.

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34. The equipment for detecting voltage tampering as defined in claim 33, whereby the water level quantity is decided dependant on delayed monotone indicators from one or more previous Assess time.

38. The equipment for detecting voltage tampering as described in declare 37, wherein the resettable hold off line segments are reset for the duration of a reset period of time, wherein the reset time frame is ahead of the Examine time frame.

A different element of the invention might reside within an apparatus for detecting clock tampering, comprising: initial circuit, a first plurality of resettable hold off line segments, a 2nd circuit, a second plurality of resettable delay line segments, and an Appraise circuit. The main circuit supplies a first monotone signal throughout a primary clock evaluate period of time related to a clock. The 1st plurality of resettable delay line segments Every delay the first monotone signal to generate a respective 1st plurality of delayed monotone alerts. Resettable hold off line segments involving a resettable hold off line phase related to a minimum more info hold off time plus a resettable hold off line section connected to a most hold off time are each linked to discretely increasing hold off times.

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Another element of the creation may perhaps reside within an equipment for detecting clock tampering, comprising: usually means 250 for giving a monotone sign 220 for the duration of a clock evaluate period of time 310 linked to a clock CLK; implies 210 for delaying the monotone signal employing a plurality of resettable hold off line segments to create a respective plurality of delayed monotone alerts 230 getting discretely escalating hold off occasions involving a minimum amount delay time and also a maximum delay time; and usually means 240 for utilizing the clock CLK to result in an Examine circuit 240 that employs the plurality of delayed monotone indicators to detect a clock fault.

One more element of the invention could reside within an apparatus for detecting clock tampering, comprising: indicates for providing a monotone sign during a clock evaluate time period related to a clock; usually means for delaying the monotone signal employing a plurality of resettable delay line segments to generate a respective plurality of delayed monotone indicators getting discretely escalating hold off times among a minimum hold off time plus a highest hold off time; and means for utilizing the clock to bring about an Consider circuit that works by using the plurality of delayed monotone alerts to detect a clock fault.

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