seventeen. The equipment for detecting clock tampering as defined in declare 15, whereby the Consider circuit is brought on by a clock edge at an finish with the clock evaluate period of time.
Resettable delay line segments in between a resettable delay line section 210-one affiliated with a bare minimum hold off time and a resettable delay line section 210-N connected to a utmost delay time are Each individual related to discretely rising delay moments. An Consider circuit 240 is triggered by a clock CLK and works by using the plurality of delayed monotone indicators to detect a voltage fault.
One more aspect of the creation could reside within an apparatus for detecting clock tampering, comprising a circuit that provides a monotone sign, a plurality of resettable delay line segments, and an Examine circuit. The circuit gives the monotone sign throughout a clock evaluate time frame connected to a clock. The plurality of resettable delay line segments delay the monotone signal to generate a respective plurality of delayed monotone alerts.
The procedure with the invention could be implemented depending on combinatorial logic working with static CMOS, which is relatively cost-effective primarily based the processor's present circuit integration. Detection compensation for procedure, voltage, and temperature versions from the hold off strains, can be achieved by adapting the number of delay strains and multi-frequency program support.
26. The strategy for detecting voltage tampering as described in assert 23, whereby the evaluate circuit determines irrespective of whether the number of kinds within the plurality of delayed monotone signals differs from a water level range by much more than a predetermined threshold.
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What is claimed is: 1. A method for detecting clock tampering, comprising: providing a plurality of resettable delay line segments, whereby resettable hold off line segments amongst a resettable delay line section related to a minimum amount delay time and a resettable hold off line section connected with a greatest hold off time are Just about every connected with discretely raising delay moments;
The sloped major clock enclosure is utilized Usually use within a Wellbeing care or correction atmosphere which the consumers are generally not significant danger, even so optimum safety towards your hardware is crucial
four. The method for detecting clock tampering as defined in assert 1, whereby the Examine circuit establishes irrespective of whether the amount of ones in the plurality of delayed monotone signals differs from a h2o stage selection by more than a predetermined threshold.
A up to date analogue clock, which is fixed into our United kingdom registered structure 6081840 anti-ligature clock
twelve. The equipment for detecting clock tampering as described in assert 11, whereby the h2o amount variety is decided depending on delayed monotone indicators from one or more former clock Examine time.
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A different facet of the invention could reside within an equipment for detecting voltage tampering, comprising: indicates for giving a monotone signal all through an Consider time; suggests for delaying the monotone sign utilizing a plurality of resettable hold off line segments to deliver a respective plurality of delayed monotone signals possessing discretely rising hold off situations amongst a least delay time along with a greatest delay time; and implies for using the clock to trigger an Examine circuit that uses the plurality of delayed monotone alerts to detect a voltage fault.
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