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Level sensitive scan design (LSSD) system

  • US 4,293,919 A
  • Filed: 08/13/1979
  • Issued: 10/06/1981
  • Est. Priority Date: 08/13/1979
  • Status: Expired due to Term
First Claim
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1. A system of logic for performing at least one predetermined logical function, said system of logic including:

  • a plurality of combinational logic circuits;

    a multi-stage shift register having an input, an output, and shift controls;

    each stage of said multi-stage shift register comprising first and second interconnected DC latches;

    and circuit means interconnecting said plurality of combinational logic circuits and said first and second interconnected D.C. latches of said multi-stage shift register, whereby said shift register is available for use in the testing of each of said plurality of combinational logic circuits and each of said D.C. latches of said multi-stage shift register is also available for use as an independently operable data latch in providing said at least one predetermined logical function.

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