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Flip-flop chaining architecture for power-efficient scan during test application

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3 Author(s)
Gupta, S. ; IIT Guwahati North Guwahati, Assam ; Vaish, T. ; Chattopadhyay, S.

Power dissipation in CMOS circuits during test time poses a crucial bottleneck for circuit performance and robustness. The power consumption due to switching activity while scan-in of test vectors and scan-out of responses is of particular concern. In this paper a methodology for scan chain modification and test vector adaptation is proposed to effectively reduce the scan test power consumption by controlling this switching activity. Proposed approach, unlike the many in published literature, does not incorporate reordering of scan cells; thus avoiding timing and routing overheads. ATPG software ATALANTA was used for test vector generation. The algorithm was verified for ISCAS’89 benchmark circuits, where it showed as much as 27.3% of reduction in switching activity during scan operations.

Published in:

Test Symposium, 2005. Proceedings. 14th Asian

Date of Conference:

18-21 Dec. 2005

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