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Methods and circuits for synchronizing signals in a modular redundant fault tolerant computer system

  • US 5,117,442 A
  • Filed: 12/14/1988
  • Issued: 05/26/1992
  • Est. Priority Date: 12/14/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for synchronizing multiple digital input signals, wherein each said input signal is associated with a clock signal, and said clock signals have a defined period and are skewed relative to one another, said apparatus comprising:

  • first means responsive to said input signals and said clock signals for producing an initial synchronization signal corresponding to each said input signal and which is synchronized with the beginning of a period of the clock signal associated with said input signal;

    second means responsive to said initial synchronization signals and said clock signals for producing a respective set of local synchronization signals for each said clock signal, each said set of local synchronization signals corresponding to said initial synchronization signals and being synchronized with the midpoint of a period of the respective clock signal;

    third means responsive to said local synchronization signals for comparing each said set of local synchronization signals and for producing a comparison output signal for each said comparison; and

    fourth means responsive to said comparison output signals and said clock signals for producing a final synchronization signal for each said comparison output signal, each said final synchronization signal being synchronized with the beginning of a clock period of the same clock signal with which the set of local synchronization signals used to produce the comparison output signal was synchronized, such that said final synchronization signals are mutually synchronized within the limits of the skew between said clock signals.

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