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Wakeup circuit for computer system that enables codec controller to generate system interrupt in response to detection of a wake event by a codec

  • US 6,564,330 B1
  • Filed: 12/23/1999
  • Issued: 05/13/2003
  • Est. Priority Date: 12/23/1999
  • Status: Expired due to Term
First Claim
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1. A wakeup circuit, comprising:

  • a data circuit with a first data input to receive a first data input signal from a first codec;

    a clock status circuit with a first clock status input to receive a clock status signal and a second clock status input coupled to an output of the data circuit;

    a device status circuit with a first device status input to receive a device status signal and a second device status input coupled to an output of the clock status circuit; and

    a wakeup status circuit with a first wakeup status input coupled to an output of the device status circuit to receive a wakeup status signal, and a wakeup status output to assert a wakeup signal if said device status signal is asserted and to assert said wakeup status signal if said clock status input signal is not asserted and said first data input signal is asserted.

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