Real time clock monitoring method and system
First Claim
1. A device having real time clock monitoring capabilities, the device comprises:
- a real time clock tree that is coupled to a clock frequency monitor that is adapted to determine a frequency of a real time clock signal, during a short monitoring period;
a monitoring enable module, coupled to the real time clock tree and to the clock frequency monitor, adapted to activate the clock frequency monitor during short monitoring periods and to deactivate the clock frequency monitor during other periods, wherein the monitoring enable module is adapted to determine a timing of the short monitoring periods in a non-deterministic manner; and
a real time clock violation indication generator, coupled to the clock frequency monitor, adapted to indicate that a real time clock violation occurred, in response to an error signal provided from the clock frequency monitor.
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Accused Products
Abstract
Method for monitoring a real time clock and a device having real time clock monitoring capabilities, the device includes: (i) a real time clock tree, (ii) a clock frequency monitor that is adapted to determine a frequency of a real time clock signal, during a short monitoring period; (iii) a monitoring enable module, adapted to activate the clock frequency monitor during short motoring periods and to deactivate the clock frequency monitor during other periods, wherein the monitoring enable module is adapted to determine a timing of the short monitoring periods in a non-deterministic manner; and (iv) a real time clock violation indication generator adapted to indicate that a real time clock violation occurred, in response to an error signal provided from the clock frequency monitor.
23 Citations
20 Claims
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1. A device having real time clock monitoring capabilities, the device comprises:
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a real time clock tree that is coupled to a clock frequency monitor that is adapted to determine a frequency of a real time clock signal, during a short monitoring period; a monitoring enable module, coupled to the real time clock tree and to the clock frequency monitor, adapted to activate the clock frequency monitor during short monitoring periods and to deactivate the clock frequency monitor during other periods, wherein the monitoring enable module is adapted to determine a timing of the short monitoring periods in a non-deterministic manner; and a real time clock violation indication generator, coupled to the clock frequency monitor, adapted to indicate that a real time clock violation occurred, in response to an error signal provided from the clock frequency monitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for monitoring a real time clock signal, the method comprises:
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measuring, during a short monitoring period and by a clock frequency monitor, a frequency of the real time clock signal; determining in a non-deterministic manner, a timing of a next short monitoring period; indicating that a real time clock violation occurred if the frequency of the real time clock signal is outside a predefined frequency window; deactivating the clock frequency monitor until a beginning of the next short monitoring period and jumping to the stage of measuring the frequency of the real time clock signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification