Reusing Scan Chains for Test Pattern Decompression

  • Authors:
  • Rainer Dorsch;Hans-Joachim Wunderlich

  • Affiliations:
  • University of Stuttgart, Breitwiesenstr. 20-22, D-70567 Stuttgart, Germany. rainer.dorsch@informatik.uni-stuttgart.de;University of Stuttgart, Breitwiesenstr. 20-22, D-70567 Stuttgart, Germany. wu@informatik.uni-stuttgart.de

  • Venue:
  • Journal of Electronic Testing: Theory and Applications
  • Year:
  • 2002

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Abstract

The paper presents a method for testing a system-on-a-chip by using a compressed representation of the patterns on an external tester. The patterns for a certain core under test are decompressed by reusing scan chains of cores idle during that time. The method only requires a few additional gates in the wrapper, while the mission logic is untouched. Storage and bandwidth requirements for the ATE are reduced significantly.