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Static timing analysis of semiconductor digital circuits

  • US 4,924,430 A
  • Filed: 01/28/1988
  • Issued: 05/08/1990
  • Est. Priority Date: 01/28/1988
  • Status: Expired due to Fees
First Claim
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1. A method of verifying time-oriented operating requirements of a logic circuit including logic elements that are to be fabricated as semiconductor circuits to operate with propagation delays therethrough on applied data and clock signals that are correlated within predetermined ranges of timing parameters, the method comprising the steps of:

  • designating for each of the logic elements the absolute fast and relative slow extremes of one range of propagation delays therethrough;

    designating for each of said logic elements the relative fast and absolute slow extremes of another range of propagation delays therethrough;

    tracing selected data signal paths including logic elements through the logic circuit;

    tracing selected clock signal paths through the logic circuit to selected logic elements;

    accumulating the propagation delays at said absolute fast, relative slow, relative fast and absolute slow extremes of said ranges for logic elements along both the selected clock path and data signal path;

    comparing the accumulated absolute fast path values to the relative slow path values of one range of propagation delays of the respective clock and data paths through the selected logic elements to determine the correlation of said absolute fast path values and said relative slow path values within a predetermined range of timing parameters; and

    comparing the accumulated relative fast path values to the absolute slow path values of another range of propagation delays of the respective clock and data paths through the selected logic elements to determine the correlation of said relative fast path values and said absolute slow path values within a predetermined range of timing parameters.

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