Automatic activity detection in a display controller
First Claim
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1. A method of automatically detecting activity in a display controller, the method comprising:
- determining a power state of a power regulator based on whether a reference clock signal is toggling;
in the event that the reference clock signal is toggling, charging a capacitor to a high state at a predetermined voltage and generating a first output signal indicative of an on-board power supply of the display being powered on, wherein the on-board power supply remains powered on for operational states of the capacitor that exceed the redetermined voltage;
in the event that the reference clock signal is not toggling, charging a capacitor to a low state and generating a second output signal indicative of the on-board power supply being powered off; and
outputting the first output signal or the second output signal;
wherein the reference clock is a high frequency clock, the method further comprising;
turning off a low frequency clock when the on-board power supply is powered on; and
turning on the low frequency clock when the on-board power supply is powered off.
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Abstract
Detecting when the on-board power supply is powered on or off by an auto activity detection circuit by determining if the reference clock signal (TCLK) is toggling, and, if the reference clock signal is toggling, then charging a capacitor to a high voltage in the auto activity detection circuit based on the toggling reference clock signal, and outputting an on-board power supply activity signal based upon the high voltage by the auto activity detection circuit indicative of whether or not the on-board power supply is active.
51 Citations
19 Claims
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1. A method of automatically detecting activity in a display controller, the method comprising:
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determining a power state of a power regulator based on whether a reference clock signal is toggling; in the event that the reference clock signal is toggling, charging a capacitor to a high state at a predetermined voltage and generating a first output signal indicative of an on-board power supply of the display being powered on, wherein the on-board power supply remains powered on for operational states of the capacitor that exceed the redetermined voltage; in the event that the reference clock signal is not toggling, charging a capacitor to a low state and generating a second output signal indicative of the on-board power supply being powered off; and outputting the first output signal or the second output signal; wherein the reference clock is a high frequency clock, the method further comprising; turning off a low frequency clock when the on-board power supply is powered on; and turning on the low frequency clock when the on-board power supply is powered off. - View Dependent Claims (2, 3, 4)
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5. A method of detecting whether an on-board power supply is powered on, the method comprising:
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connecting a first terminal of a first resistor to an input node to receive a clock signal, wherein the clock signal indicates a power state of a power regulator based on whether the clock signal is toggling; connecting a first terminal of a capacitor to a second terminal of the first resistor at a node N1; connecting a first terminal of a second resistor to a second terminal of the capacitor; and connecting a second terminal of the second resistor to the node N1, wherein in response to the clock signal being received by the input node as toggling, the capacitor drives the output node to a state indicating that the on-board power supply is powered on, and wherein in response to the clock signal being received by the input node as not toggling, the output node is at a state indicating that the on-board power supply is powered off. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification