On clustering of undetectable single stuck-at faults and test quality in full-scan circuits

  • Authors:
  • Irith Pomeranz;Sudhakar M. Reddy

  • Affiliations:
  • School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN;Department of Electrical and Computer Engineering, University of Iowa, Iowa City, IA

  • Venue:
  • IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
  • Year:
  • 2010

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Abstract

We demonstrate that undetectable single stuck-at faults in full-scan benchmark circuits tend to cluster in certain areas. This implies that certain areas may remain uncovered by a test set for single stuck-at faults. We describe an exteusion to the set of target faults aimed at providing a better coverage of the circuit in the presence of undetectable single stuck-at faults. The extended set of target faults consists of double stuck-at faults that include an undetectable fault as one of their components. The other component is a detectable fault adjacent to the undetectable fault. We present experimental results of fault simulation and test generation for the extended set of target faults.