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CLOCK SWITCHING CIRCUITS AND METHODS

  • US 20110026656A1
  • Filed: 02/28/2009
  • Published: 02/03/2011
  • Est. Priority Date: 02/28/2008
  • Status: Active Grant
First Claim
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1. For use in a system having multiple clock sources, a method for switching to a selected one of the multiple clock sources comprising:

  • detecting an activity-status indication of the selected clock source;

    generating a selection based update-enable signal responsive to the detected activity-status indication of the selected clock source;

    in response to a clock switch request for switching to the selected clock source and based on the generated selection based update-enable signal, updating a clock select input signal; and

    controlling switching to the selected clock source based on the updated clock select input signal.

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