Power management of a wireless device
First Claim
1. A method for power management of a wireless device comprising a processor and a volatile storage device which is connected to and used by the processor, the method comprising:
- supplying a first voltage level to the volatile storage device during a period when the processor is in an operating state;
supplying a second voltage level to the volatile storage device for retaining data during a period when the processor is in a reduced power state, wherein the second voltage level is lower than the first voltage level; and
determining a value of the second voltage level by;
(i) supplying an initial value of the second voltage level to the volatile storage device;
(ii) performing a self-test of the volatile storage device while the second voltage level is supplied to the volatile storage device to provide a result indicating a number of data errors in the volatile storage device;
(iii) comparing the result of the self-test with a threshold number of data errors;
(iv) varying the second voltage level to a new value and repeating steps (i)-(iii) with the new value of the second voltage level to find a minimum value of the second voltage level at which the result of the test gives a number of data errors less than the threshold number of data errors.
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Accused Products
Abstract
A method for power management of a wireless device is described. The method comprises supplying a first voltage level to a volatile storage device during a period when the processor is in an operating state; supplying a second voltage level, lower that the first voltage level, to the storage device for retaining data during a period when the processor is in a reduced power state, and determining a value of the second voltage level. The second voltage level is determined by performing a self-test of the storage device to find a minimum second voltage level that gives a number of data errors below a predetermined threshold.
7 Citations
15 Claims
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1. A method for power management of a wireless device comprising a processor and a volatile storage device which is connected to and used by the processor, the method comprising:
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supplying a first voltage level to the volatile storage device during a period when the processor is in an operating state; supplying a second voltage level to the volatile storage device for retaining data during a period when the processor is in a reduced power state, wherein the second voltage level is lower than the first voltage level; and determining a value of the second voltage level by; (i) supplying an initial value of the second voltage level to the volatile storage device; (ii) performing a self-test of the volatile storage device while the second voltage level is supplied to the volatile storage device to provide a result indicating a number of data errors in the volatile storage device; (iii) comparing the result of the self-test with a threshold number of data errors; (iv) varying the second voltage level to a new value and repeating steps (i)-(iii) with the new value of the second voltage level to find a minimum value of the second voltage level at which the result of the test gives a number of data errors less than the threshold number of data errors. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless device comprising:
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a processor; a volatile storage device which is connected to and for use by the processor; a power management unit arranged to; supply a first voltage level to the volatile storage device during a period when the processor is in an operating state; supply a second voltage level to the volatile storage device for retaining data during a period when the processor is in a reduced power state, wherein the second voltage is lower than the first voltage level; and determine a value of the second voltage level by; (i) supplying an initial value of the second voltage level to the volatile storage device; (ii) performing a self-test of the volatile storage device while the second voltage level is supplied to the volatile storage device to provide a result indicating a number of data errors in the volatile storage device; (iii) comparing the result of the test with a threshold number of data errors; (iv) varying the second voltage level to a new value and repeating steps (i)-(iii) with the new value of the second voltage level to find a minimum value of the second voltage level at which the result of the test gives a number of data errors less than the threshold number of data errors. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for determining an optimum voltage value to supply to a volatile storage device, the method comprising:
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(i) supplying an initial value of a voltage level to the volatile storage device; (ii) performing a self-test of the volatile storage device while the voltage level at the initial value is supplied to the volatile storage device to provide a result indicating a number of data errors in the volatile storage device; (iii) comparing the result of the self-test with a threshold number of data errors; (iv) varying the voltage level to a new value and repeating steps (i)-(iii) with the new value of the voltage level to find a minimum value of the voltage level at which the result of the test gives a number of data errors less than the threshold number of data errors.
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Specification