The smart Trick of Anti-Tamper Digital Clocks That No One is Discussing

The smart Trick of Anti-Tamper Digital Clocks That No One is Discussing

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seventeen. The apparatus for detecting clock tampering as defined in declare 15, wherein the Assess circuit is activated by a clock edge at an close of the clock Assess time period.

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thirty. An apparatus for detecting voltage tampering, comprising: signifies for offering a gradual-point out monotone sign in the course of an evaluate time period;

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In other additional in depth elements of the creation, Each and every in the plurality of delayed monotone indicators 230 could possibly be either a one or possibly a zero. The evaluate circuit 240 might determine no matter whether the amount of types inside the plurality of delayed monotone signals differs from the h2o level number by a lot more than a predetermined threshold.

signifies for delaying the monotone signal to make a plurality of delayed monotone alerts obtaining discretely expanding delay moments in between a least hold off time plus a maximum hold off time and each in the plurality of delayed monotone indicators acquiring possibly a one or possibly a zero logic benefit;

The second circuit provides a second monotone signal throughout a second clock Assess period of time linked to the clock. The second clock Consider time period covers a unique time than the primary clock Assess time frame. The next plurality of resettable hold off line segments each hold off the very first monotone sign to deliver a respective second plurality of delayed monotone indicators. Resettable delay line segments concerning a resettable hold off line phase connected with a bare minimum delay time plus a resettable delay line section affiliated with a most delay time are Each and every connected with discretely growing delay moments. The evaluate circuit is brought on through the clock and employs the primary plurality of delayed monotone alerts or the next plurality of delayed monotone indicators to detect a clock fault.

fifteen. An apparatus for detecting clock tampering, comprising: a circuit that gives a monotone signal for the duration of a clock Examine period of time affiliated with a clock;

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eleven. The apparatus for detecting clock tampering as defined in claim 8, wherein-the suggests for analyzing establishes no matter whether the number of types during the plurality of delayed monotone signals differs from a drinking water stage number by more than a predetermined threshold.

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One more aspect of the creation may perhaps reside in an equipment for detecting clock tampering, comprising: suggests for delivering a monotone signal all through 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 having discretely raising hold off occasions among a minimum delay time in addition here to a highest delay time; and usually means for using the clock to trigger an Consider circuit that uses the plurality of delayed monotone indicators to detect a clock fault.