Anti-Tamper Digital Clocks - An Overview
Anti-Tamper Digital Clocks - An Overview
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The reset period of time could be previous to the clock Examine period of time. Utilizing the clock to result in the Assess circuit may possibly use a clock edge at an stop of the clock Assess time period to set off the Appraise circuit.
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25. The strategy for detecting voltage tampering as described in declare 23, wherein using the clock to bring about the Examine circuit comprises using a clock edge at an close from the Appraise time frame to set off the evaluate circuit.
In other extra comprehensive components of the invention, Every from the plurality of delayed monotone indicators 230 could be possibly a one particular or perhaps a zero. The Appraise circuit 240 may ascertain no matter if the number of ones during the plurality of delayed monotone indicators differs from a drinking water stage variety by in excess of a predetermined threshold.
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SUMMARY An aspect of the existing creation might reside in a technique for detecting clock tampering. In the method a plurality of resettable hold off line segments are furnished. Resettable hold off line segments concerning a resettable hold off line section connected to a least delay time and also a resettable hold off line section connected to a optimum hold off time are each associated with discretely escalating hold off times.
15. An equipment for detecting clock tampering, comprising: a circuit that gives a monotone sign all through a clock Consider period of time affiliated with a clock;
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In additional in-depth elements of the invention, the strategy may well additional contain resetting the resettable hold off line segments through a reset time frame.
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27. The tactic for detecting read more voltage tampering as outlined in declare 26, wherein the h2o stage quantity is decided according to delayed monotone alerts from a number of previous Assess time.
In-frame design and style allows clock being accessed for adjustment or battery improve without removing metal housing
utilizing a clock to induce an Assess circuit that employs the plurality of delayed monotone signals to detect a voltage fault.