Effective diagnostics through interval unloads in a BIST environment

  • Authors:
  • Peter Wohl;John A. Waicukauski;Sanjay Patel;Greg Maston

  • Affiliations:
  • Synopsys Inc., Williston VT;Synopsys Inc., Tualatin OR;Synopsys Inc., Beaverton OR;Synopsys Inc., Denver CO

  • Venue:
  • Proceedings of the 39th annual Design Automation Conference
  • Year:
  • 2002

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Abstract

Logic built-in self test (BIST) is increasingly being adopted to improve test quality and reduce test costs for rapidly growing designs. Compared to deterministic automated test pattern gener驴ation (ATPG), BIST presents inherent fault diagnostic challenges. Previous diagnostic techniques have been limited in their diagnosis resolution and/or require significant hardware overhead. This paper proposes an interval-based scan-unload method that ensures diagnosis resolution down to gate-level faults with minimal hard驴ware overhead. Tester fail-data collection is based on a novel con驴struct incorporated into the design-extensions of the standard test-interface language (STIL). The implementation of the proposed method is presented and analyzed.