Testing C-elements is not elementary

  • Authors:
  • J. A. Brzozowski;K. Raahemifar

  • Affiliations:
  • -;-

  • Venue:
  • ASYNC '95 Proceedings of the 2nd Working Conference on Asynchronous Design Methodologies
  • Year:
  • 1995

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Abstract

We examine stuck-at faults in several gate circuits realizing the C-element. We exhibit circuits with the following phenomena: (a) 50% of single faults do not cause the circuit to halt. (b) Some faults are not detectable by logic tests. (c) A test of length seven is required to detect all detectable single faults. (d) A fault may result in an oscillation. (e) A fault may destroy the speed-independence of a circuit. We also analyze static and dynamic CMOS implementations of the C-element.