Circuit and method for detecting and selecting clock sources

  • US 6,292,045 B1
  • Filed: 11/29/1999
  • Issued: 09/18/2001
  • Est. Priority Date: 11/29/1999
  • Status: Expired due to Term
First Claim
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1. A circuit for detecting and selecting one of clock signals of at least two clock sources, comprising:

  • a controller coupled to first and second clock sources of the at least two clock sources and programmable to choose one of first and second clock signals of the first and second clock sources designated by a first programmed code, wherein the controller selects the designated clock signal when the designated clock signal has been received, and further wherein the controller automatically selects the undesignated clock signal when the designated clock signal has not been received and the undesignated clock signal has been received.

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