On Structural vs. Functional Testing for Delay Faults

  • Authors:
  • Angela Krstic;Jing-Jia Liou;Kwang-Ting (Tim) Cheng;Li-C. Wang

  • Affiliations:
  • -;-;-;-

  • Venue:
  • ISQED '03 Proceedings of the 4th International Symposium on Quality Electronic Design
  • Year:
  • 2003

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Abstract

A structurally testable delay fault might become untestable inthe functional mode of the circuit due to logic or timing constraints or both. Experimental data suggests that there couldbe a large difference in the number of structurally and functionally testable delay faults. However, this difference is usually calculated based only on logic constraints. It is unclearhow this difference would change if timing constraints weretaken into consideration, especially when using statistical timing models. In this paper, our goal is to better understandhow structural and functional test strategies might affect thedelay test quality and consequently, change our perception ofthe delay test results.