Method and apparatus for entering a low power mode
First Claim
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1. A method for entering a low power mode, comprising:
- providing a first power control mode indicator to a first power control stage, said first power control mode indicator selecting a first low power mode;
receiving a trigger input signal at said first power control stage triggering at least a first module to enter said first low power mode;
providing a first request signal requesting said first module to enter said first low power mode based on said trigger input signal;
providing a first response signal indicating that said first module is ready to enter said first low power mode; and
providing a first control signal in response to said first response signal, said first control signal enabling low power features corresponding to said first low power mode.
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Abstract
A method and apparatus for entering a low power mode is provided. In one embodiment, data processing system (10) has power control circuitry (52) which may be used to control power usage in data processing system (10). Power mode select circuitry (84) may be used to select a power mode. Depending upon the power mode selected, power control circuitry (52) may use a cascaded approach to selecting which portions of data processing system (10) will be powered down, and thus how deeply data processing system (10) will be powered down.
40 Citations
21 Claims
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1. A method for entering a low power mode, comprising:
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providing a first power control mode indicator to a first power control stage, said first power control mode indicator selecting a first low power mode; receiving a trigger input signal at said first power control stage triggering at least a first module to enter said first low power mode; providing a first request signal requesting said first module to enter said first low power mode based on said trigger input signal; providing a first response signal indicating that said first module is ready to enter said first low power mode; and providing a first control signal in response to said first response signal, said first control signal enabling low power features corresponding to said first low power mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for entering a low power mode, comprising:
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a first module; a first power control stage coupled to said first module; a first power control mode indicator provided to said first power control stage, said first power control mode indicator selecting a first low power mode; a trigger input signal received at said first power control stage triggering at least said first module to enter said first low power mode; a first request signal requesting said first module to enter said first low power mode, said first request signal based on said trigger input signal; a first response signal indicating that said first module is ready to enter said first low power mode; and a first control signal provided in response to said first response signal, said first control signal enabling low power features corresponding to said first low power mode, wherein said first request signal is deasserted based on said first trigger input signal. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus for entering a low power mode, comprising:
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a first power control stage, said first power control stage receiving a first input signal and generating a first request signal based on said first input signal; and a first module coupled to said first power control stage, wherein said first module receives said first request signal and provides a first response signal in response to receiving said first request signal, said first response signal indicating that said first module is ready to enter a first low power mode, said first low power mode being predicated by a mode indicator, said first power control stage providing a first control signal in response to said first response signal, said first request signal being deasserted based on said first control signal. - View Dependent Claims (21)
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Specification