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Clock alignment detection from single reference

  • US 20070116164A1
  • Filed: 11/22/2005
  • Published: 05/24/2007
  • Est. Priority Date: 11/22/2005
  • Status: Active Grant
First Claim
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1. A data communications system comprising:

  • a source clock signal;

    a first clock domain comprising a first clock signal which is derived from the source clock signal, wherein the first clock signal has a first frequency; and

    a second clock domain comprising a second clock signal which is derived from the source clock signal, wherein the second clock signal has a second frequency which is different from the first frequency;

    wherein the first clock domain includes circuitry which is configured to;

    generate a reference clock signal derived from the source clock signal;

    generate the first clock signal;

    utilize the first clock signal to sample the reference clock signal; and

    assert an aligned signal responsive to detecting an edge of the reference clock signal, wherein the aligned signal indicates an edge of the first clock signal is aligned with an edge of the second clock signal.

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