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Apparatus and method for initiating a sleep state in a system on a chip device

  • US 7,039,819 B1
  • Filed: 04/30/2003
  • Issued: 05/02/2006
  • Est. Priority Date: 04/30/2003
  • Status: Active Grant
First Claim
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1. For use in a data processing system that comprises a system-on-a-chip (SOC) device that comprises a central processing unit and a plurality of system-on-a-chip (SOC) modules, an apparatus for initiating a sleep state in said system-on-a-chip (SOC) device in said data processing system, said apparatus comprising;

  • a power management controller coupled to said central processing unit and to said plurality of SOC modules, said power management controller capable of;

    initiating a sleep state in said system-on-a-chip (SOC) device by sending a sleep request signal to said central processing unit to cause said central processing unit to enter a sleep state and by sending to each of said plurality of SOC modules a clock disable request signal to cause each of said plurality of SOC modules to enter a sleep state;

    receiving a suspension request acknowledgement signal from said central processing unit acknowledging that said central processing unit had entered a sleep state; and

    in response to receiving said suspension request acknowledgement signal from said central processing unit, sending a clock disable request signal to each of said plurality of SOC modules.

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