Defect-Aware SOC Test Scheduling

  • Authors:
  • Erik Larsson;Julien Pouget;Zebo Peng

  • Affiliations:
  • Linköpings Universitet, Linköping, Sweden;Montpellier 2 University, France;Linköpings Universitet, Linköping, Sweden

  • Venue:
  • VTS '04 Proceedings of the 22nd IEEE VLSI Test Symposium
  • Year:
  • 2004

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Abstract

In this paper we address the test scheduling problem forsystem-on-chip designs. Different from previous approacheswhere it is assumed that all tests will be performed untilcompletion, we consider the cases where the test processwill be terminated as soon as a defect is detected. This iscommon practice in production test of chips. The proposedtechnique takes into account the probability of defect-detectionby a test in order to schedule the tests so that theexpected total test time will be minimized. We investigatedifferent test bus structures, test scheduling strategies(sequential scheduling vs. concurrent scheduling), and testset assumptions (fixed test time vs. flexible test time). Wehave also made experiments to illustrate the efficiency oftaking defect probability into account during testscheduling.