Dynamic diagnosis of sequential circuits based on stuck-at faults

  • Authors:
  • S. Venkataraman;I. Hartanto;W. Kent Fuchs

  • Affiliations:
  • -;-;-

  • Venue:
  • VTS '96 Proceedings of the 14th IEEE VLSI Test Symposium
  • Year:
  • 1996

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Abstract

A dynamic diagnosis scheme for synchronous sequential circuits is proposed. In contrast with schemes like fault dictionaries no prior computation and storage of fault symptoms is performed. The technique combines cause-effect and effect-cause strategies. Cause-effect analysis is performed by single stuck at fault simulation followed by a matching algorithm. Effect-cause analysis is performed by an error propagation back-trace starting from the falling outputs. The error propagation back-trace eliminates from consideration faults that could not have caused the failing symptoms. The procedure is exact for defects behaving as single stuck-at faults. Experimental results are provided for the ISCAS89 benchmark circuits.