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Power managers for an integrated circuit

  • US 8,762,923 B2
  • Filed: 05/16/2012
  • Issued: 06/24/2014
  • Est. Priority Date: 05/07/2003
  • Status: Expired due to Term
First Claim
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1. A system comprising:

  • an integrated circuit to effect power consumptions in operation, the power consumptions including a first power consumption and a second power consumption;

    a plurality of power islands of the integrated circuit including a first power island having an associated power consumption, the associated power consumption of the first power island being the second power consumption;

    a first power manager configured to manage the first power consumption based on needs and operation of the integrated circuit; and

    a second power manager configured to;

    a) communicate with the first power manager; and

    b) respond to a request to manage the second power consumption for the first power island by;

    i) changing a source voltage of the first power island;

    ii) after the changing, waiting for the source voltage of the first power island to settle down; and

    iii) after the waiting, changing a clock frequency of the first power island.

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