Non-scan design-for-testability of RT-level data paths

  • Authors:
  • Sujit Dey;Miodrag Potkonjak

  • Affiliations:
  • C&C Research Laboratories, NEC, Princeton, NJ;C&C Research Laboratories, NEC, Princeton, NJ

  • Venue:
  • ICCAD '94 Proceedings of the 1994 IEEE/ACM international conference on Computer-aided design
  • Year:
  • 1994

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Abstract

This paper presents a non-scan design-for-testability technique applicable to register-transfer (RT) level data path circuits, which are usually very hard-to-test due to the presence of complex loop structures. We develop a new testability measure, and utilize the RT-level structure of the data path, for cost-effective re-design of the circuit to make it easily testable, without having to either scan any flip-flop or breakloops directly. The non-scan DFT technique was applied to several data path circuits. Experimental results demonstrate the feasibility of producing non-scan testable data paths, which can be tested at-speed. The hardware overhead and the test application time required for the non-scan designs is significantly lower than the corresponding partial scan designs.