Test Vector Modification for Power Reduction during Scan Testing

  • Authors:
  • Seiji Kajihara;Koji Ishida;Kohei Miyase

  • Affiliations:
  • -;-;-

  • Venue:
  • VTS '02 Proceedings of the 20th IEEE VLSI Test Symposium
  • Year:
  • 2002

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Abstract

This paper presents a test vector modification method for reducing power dissipation during test application for a full-scan circuit. The method first identifies a set of don't care (X) inputs of given test vectors, to which either logic value 0 or 1 an be assigned without losing fault coverage. Then, the method reassigns logic values to the X inputs so as to decrease switching activity of the circuit during scan shifting. Experimental results for benchmark circuits show the proposed method could decrease switching activity of a given test set to 48% of the original test set.