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Low-energy BIST design for scan-based logic circuits

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3 Author(s)
Bhattacharya, B.B. ; Dept. of Comput. Sci. & Eng., Nebraska Univ., Lincoln, NE, USA ; Seth, S.C. ; Sheng Zhang

In a random testing environment, a significant amount of energy is wasted in the LFSR and in the CUT by useless patterns that do not contribute to fault dropping. Another major source of energy drainage is the loss due to random switching activity in the CUT and in the scan path between applications of two successive vectors. In this work, a new built-in self-test (GIST) scheme for scan-based circuits is proposed for reducing such energy consumption. A mapping logic is designed which modifies the state transitions of the LFSR such that only the useful vectors are generated according to a desired sequence. Further, it reduces test application time without affecting fault coverage. Experimental results on ISCAS-89 benchmark circuits reveal a significant amount of energy savings in the LFSR during random testing.

Published in:

VLSI Design, 2003. Proceedings. 16th International Conference on

Date of Conference:

4-8 Jan. 2003

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