Not known Details About Anti-Tamper Digital Clocks
Not known Details About Anti-Tamper Digital Clocks
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Clock-signals with uneven obligation cycles may very well be detected by using dual circuits: a person pushed from the clock sign and A different driven from the negated clock sign. With no dual circuits, the frequency could be slowed down undetectably by raising the reset time period but holding the evaluation period constant.
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suggests for evaluating that takes advantage of the plurality of delayed monotone alerts to detect a clock fault and
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forty one. The apparatus for detecting voltage tampering as described in declare forty, whereby the h2o stage amount is decided based on delayed monotone signals from a number of earlier Consider time.
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Disclosed is a method for detecting clock tampering. In the method a plurality of resettable hold off line segments are presented. Resettable delay line segments among a resettable delay line section connected with a minimal hold off time plus a resettable hold off line section related to a utmost hold off time are Every affiliated with discretely escalating hold off moments.
38. The apparatus for detecting voltage tampering as defined in assert 37, whereby the resettable hold off line segments are reset for the duration of a reset time period, wherein the reset time period is just before the Assess period of time.
a primary plurality of resettable hold off line segments that every delay the first monotone sign to crank out a respective 1st plurality of delayed monotone signals, wherein resettable hold off line segments amongst a resettable delay line phase related to a minimum delay time plus a resettable delay line section affiliated with a maximum hold off time are Every connected to discretely rising delay periods;
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A further aspect of the creation may well reside within an apparatus for detecting clock tampering, comprising: usually means for delivering a monotone sign for the duration of a clock evaluate time frame linked to a clock; means for delaying the monotone signal utilizing a plurality of resettable hold off line segments to produce a respective plurality of delayed monotone indicators owning discretely expanding hold off moments amongst a minimum delay time plus a greatest hold off Anti-Tamper Digital Clocks time; and suggests for utilizing the clock to bring about an Appraise circuit that utilizes the plurality of delayed monotone indicators to detect a clock fault.