The Anti-Tamper Digital Clocks Diaries
The Anti-Tamper Digital Clocks Diaries
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The reset time period may be just before the clock Consider time frame. Using the clock to set off the evaluate circuit may well utilize a clock edge at an end of the clock Consider time frame to set off the Examine circuit.
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The h2o stage quantity could possibly be identified based upon delayed monotone alerts from a number of past clock Assess time. The plurality of resettable delay line segments may possibly comprise taps together a delay line. Alternatively, the plurality of resettable hold off line segments comprises parallel hold off strains.
five. The tactic for detecting clock tampering as defined in assert 4, wherein the h2o level quantity is set based on delayed monotone signals from one or more past clock Assess time.
26. The strategy for detecting voltage tampering as defined in assert 23, wherein the Assess circuit determines irrespective of whether the quantity of types inside the plurality of delayed monotone alerts differs from a h2o amount selection by greater than a predetermined threshold.
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Precisely what is claimed is: 1. A method for detecting clock tampering, comprising: delivering a plurality of resettable delay line segments, whereby resettable delay line segments concerning a resettable delay line segment connected to a minimum amount delay time plus a resettable hold off line phase affiliated with a greatest hold off time are Each and every linked to discretely escalating hold off instances;
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Thorough DESCRIPTION The phrase “exemplary” is made use of herein to suggest “serving as an example, instance, or illustration.” Any embodiment explained herein as “exemplary” just isn't essentially to become construed as favored or advantageous above other embodiments.
24. The tactic check here for detecting voltage tampering as outlined in declare 23, additional comprising: resetting the resettable delay line segments for the duration of a reset time period, whereby the reset time frame is prior to the Appraise time frame.
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One more element of the creation may perhaps reside in an apparatus for detecting voltage tampering, comprising: suggests for supplying a monotone sign in the course of an evaluate time; implies for delaying the monotone sign employing a plurality of resettable hold off line segments to crank out a respective plurality of delayed monotone signals acquiring discretely increasing hold off times concerning a minimum amount hold off time in addition to a maximum hold off time; and means for using the clock to trigger an evaluate circuit that employs the plurality of delayed monotone signals to detect a voltage fault.
This specific circuit functions for a water amount: circuits associated with shorter delay traces will measure a ‘0’ even though circuits linked to lengthier hold off strains will evaluate a ‘1’. A substantial water level mark and a small level mark may possibly function a set off.