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GLITCH FREE CLOCK SWITCHING CIRCUIT

  • US 20120169373A1
  • Filed: 01/05/2011
  • Published: 07/05/2012
  • Est. Priority Date: 01/05/2011
  • Status: Active Grant
First Claim
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1. A clock switching circuit that provides a clock output selectable from a plurality of clock signals, the clock switching circuit comprising:

  • a first enable synchronization logic that generates a first clock enable in response to a first enable from a first enable generation logic, the first enable synchronization logic configured to receive a first clock signal;

    a second enable synchronization logic that generates a second clock enable in response to a second enable from a second enable generation logic, the second enable synchronization logic configured to receive a second clock signal;

    a logic gate that receives the second enable and the second clock signal, the logic gate coupled to an output of the second enable synchronization logic that selects the second clock signal as a logic gate output if the second enable is logic high;

    a priority multiplexer that receives the first clock signal, the first enable and the logic gate output, the multiplexer configured to select the first clock signal as the clock output if the first enable is a logic high, irrespective of the logic gate output.

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