SYSTEM AND METHOD FOR PRESERVING PROCESSOR MEMORY DURING POWER LOSS
First Claim
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1. A method of preserving memory of a processor configured to be powered by an external source, the method comprising:
- determining a drop in a first power to be supplied to the processor;
generating a reset signal when the drop falls below a threshold;
supplying a second power from a store to the processor based on the reset signal; and
holding the reset signal until the first power rises above the threshold.
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Abstract
A method, and a system of using the method, of preserving memory of a processor powered by an external source. The method includes determining a drop in a first power to be supplied to the processor, generating a reset signal when the drop falls below a threshold, supplying a second power from a power store to the processor based on the reset signal, and holding the reset signal until the first power rises above the threshold.
47 Citations
24 Claims
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1. A method of preserving memory of a processor configured to be powered by an external source, the method comprising:
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determining a drop in a first power to be supplied to the processor; generating a reset signal when the drop falls below a threshold; supplying a second power from a store to the processor based on the reset signal; and holding the reset signal until the first power rises above the threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit for preserving memory of a processor, the circuit comprising:
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a voltage regulator configured to receive a first power from an external source, to provide power to the processor based on the first power, to determine a level of the first power supplied to the processor, and to generate a reset signal when the level of the first power drops below a threshold; a switch coupled to the voltage regulator, and configured to be activated based on the reset signal, and to transfer a second power to the processor via the voltage regulator; and a comparator coupled to the switch, and configured to compare the first power and the threshold, and to hold the reset signal until the first power rises above the threshold. - View Dependent Claims (8, 9, 10, 11, 12, 23, 24)
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13. A method of preserving memory of a processor, the method comprising:
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supplying a first power to the processor; storing at least a portion of the first power in a store; determining a drop in the first power to be supplied to the processor; generating a reset signal when the drop falls below a threshold; coupling the store to the processor when the reset signal is active; supplying a second power from the store to the processor; and holding the reset signal active until the first power rises above the threshold. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A circuit for preserving an output of a processor, the circuit comprising:
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a voltage regulator configured to receive a first power from an external source, to provide power to the processor based on the first power, to determine a level of the first power supplied to the processor, and to generate a reset signal when the level of the first power drops below a threshold; a store configured to store auxiliary power; a switch configured to couple the store to the voltage regulator when the reset signal is activated, and to transfer a second power from the store to the processor via the voltage regulator; and a comparator coupled to the switch, and configured to compare the first power and the threshold, and to hold the reset signal until the level of the first power rises above the threshold. - View Dependent Claims (20, 21, 22)
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Specification