Power management in a display controller
First Claim
1. A method of managing power in a display controller having an on-board power supply coupled to a host device having an off-board power supply by way of a connector, comprising:
- determining if the on-board power supply is active;
when it is determined that the on-board power supply is not active, thenproviding power to the display controller by the off-board power supply by way of the connector;
turning on a low frequency clock arranged to provide a low frequency clock signal;
when it is determined that the on-board power supply is active, thenproviding power to the display controller by the on-board power supply only once the display controller finishes partially completed display controller operations;
turning off the low frequency clock;
turning on a high frequency clock arranged to provide a high frequency clock signal;
wherein the display controller remains fully operational regardless of changes in the state of the on-board power supply.
1 Assignment
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Accused Products
Abstract
Managing power in a display controller having an on-board power supply coupled to a host device having an off-board power supply by way of a connector is described. If the on-board power supply is active, then power is supplied to the display controller by the off-board power supply by way of the connector and a low frequency clock arranged to provide a low frequency clock signal is turned on. Alternatively, when it is determined that the on-board power supply is active, then power is supplied to the display controller by the on-board power supply only, the low frequency clock is turned off and a high frequency clock arranged to provide a high frequency clock signal is turned on.
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Citations
17 Claims
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1. A method of managing power in a display controller having an on-board power supply coupled to a host device having an off-board power supply by way of a connector, comprising:
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determining if the on-board power supply is active; when it is determined that the on-board power supply is not active, then providing power to the display controller by the off-board power supply by way of the connector; turning on a low frequency clock arranged to provide a low frequency clock signal; when it is determined that the on-board power supply is active, then providing power to the display controller by the on-board power supply only once the display controller finishes partially completed display controller operations; turning off the low frequency clock; turning on a high frequency clock arranged to provide a high frequency clock signal; wherein the display controller remains fully operational regardless of changes in the state of the on-board power supply. - View Dependent Claims (2, 3, 4, 5)
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6. Computer program product executable by a processor for managing power in a display controller having an on-board power supply coupled to a host device having an off-board power supply by way of a connector, comprising:
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computer code for determining if the on-board power supply is active; computer code for providing power to the display controller by the off-board power supply by way of the connector when it is determined that the on-board power supply is not active; computer code for turning on a low frequency clock arranged to provide a low frequency clock signal; computer code for providing power to the display controller by the on-board power supply only once the display controller finishes partially completed operations when it is determined that the on-board power supply is active; computer code for turning off the low frequency clock; computer code for turning on a high frequency clock arranged to provide a high frequency clock signal, wherein the display controller remains fully operational regardless of changes in the state of the on-board power supply; and computer readable medium for storing the computer code. - View Dependent Claims (7, 8, 9, 10)
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11. A power manager unit coupled to a display controller having an on-board power supply coupled to a host device having an off-board power supply by way of a connector that:
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provides power to the display controller from the off-board power supply by way of the connector when the on-board power supply is not active and turns on a low frequency clock arranged to provide a low frequency clock signal, and provides power to the display controller from the on-board power supply and turns off the low frequency clock and turns on the high frequency clock arranged to provide a high frequency clock signal when it is determined that the on-board power supply is active, capable of providing power to the display controller, and partially completed operations of the display controller operations are finished, wherein the display controller remains fully operational regardless of changes in the state of the on-board power supply. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification