Automatic activity detection in a display controller
First Claim
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1. An auto activity detection circuit configured to determine whether an on-board power supply is on, the auto activity detection circuit comprising:
- an input node configured to receive a clock signal;
an output node coupled to a node N1;
a resistor having a resistor first terminal connected to the input node and a resistor second terminal connected to the node N1; and
an RC circuit section connected to the resistor second terminal at the node N1, wherein in response to the clock signal toggling, the RC circuit section is configured to drive the output node to a state indicating that the on-board power supply is on.
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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.
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Citations
12 Claims
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1. An auto activity detection circuit configured to determine whether an on-board power supply is on, the auto activity detection circuit comprising:
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an input node configured to receive a clock signal; an output node coupled to a node N1; a resistor having a resistor first terminal connected to the input node and a resistor second terminal connected to the node N1; and an RC circuit section connected to the resistor second terminal at the node N1, wherein in response to the clock signal toggling, the RC circuit section is configured to drive the output node to a state indicating that the on-board power supply is on. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An auto activity detection circuit configured to determine whether an on-board power supply is on, the auto activity detection circuit comprising:
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an input node configured to receive a clock signal; an output node coupled to a node N1; a resistor having a resistor first terminal connected to the input node and a resistor second terminal connected to the node N1; an RC circuit section connected to the resistor second terminal at the node N1, wherein in response to the clock signal toggling at a frequency, the RC circuit section is configured to drive the node N1 to a voltage indicating that the on-board power supply is on; and a first logic circuit having a first input coupled to the node N1 and a second input coupled to a signal detector, wherein in response to the first input receiving the voltage at the node N1 indicating that the on-board power supply is on and the second input receiving a signal from the signal detector indicating that the on-board power supply is on, the first logic circuit outputs an output signal to the output node indicating that the on-board power supply is on. - View Dependent Claims (9, 10)
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11. An auto activity detection circuit configured to determine whether an on-board power supply is on, the auto activity detection circuit comprising:
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an input node configured to receive a clock signal; a resistor having a resistor first terminal connected to the input node and a resistor second terminal connected to a node N1; an RC circuit section connected to the resistor second terminal at the node N1, wherein in response to receipt of a clock signal toggling at a frequency, the RC circuit section is configured to drive the node N1 to a predetermined voltage indicating that the on-board power supply is on; and a first logic circuit having a first input coupled to the node N1 and a second input coupled to receive a signal that is in a binary HIGH state when the on-board power supply is on, wherein in response to the node N1 being at the predetermined voltage and the signal being received in a binary HIGH state, the first logic circuit outputs an output signal to the output node indicating that the on-board power supply is on. - View Dependent Claims (12)
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Specification