Effects of Multi-cycle Sensitization on Delay Tests

  • Authors:
  • Arun Krishnamachary;Jacob A. Abraham

  • Affiliations:
  • -;-

  • Venue:
  • VLSID '03 Proceedings of the 16th International Conference on VLSI Design
  • Year:
  • 2003

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Abstract

Existing delay test generation techniques focus on testgeneration for combinational blocks, and assume the inputsand outputs of the block to be unconstrained. Test applicationfor delay tests is done by means of enhanced scan, scanshifting or functional justification; all these techniques imposeminimal constraints on the inputs and the outputs ofthe combinational block targeted. This leads to over-testingthe components for delay defects [11]. This paper analyzesthe gains associated with determining the multi-cycle (sequential)sensitization of delay tests. The advantages ofdetermining multi-cycle sensitization is then illustrated onbenchmark designs with and without a delay-specific faultmodel.