On Achieving Capture Power Safety in At-Speed Scan-Based Logic BIST

Akihiro TOMITA  Xiaoqing WEN  Yasuo SATO  Seiji KAJIHARA  Kohei MIYASE  Stefan HOLST  Patrick GIRARD  Mohammad TEHRANIPOOR  Laung-Terng WANG  

IEICE TRANSACTIONS on Information and Systems   Vol.E97-D   No.10   pp.2706-2718
Publication Date: 2014/10/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2014EDP7039
Type of Manuscript: PAPER
Category: Dependable Computing
at-speed scan-based logic BIST,  capture power safety,  masking,  IR-drop,  transition delay fault,  long sensitized path,  

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The applicability of at-speed scan-based logic built-in self-test (BIST) is being severely challenged by excessive capture power that may cause erroneous test responses even for good circuits. Different from conventional low-power BIST, this paper is the first to explicitly focus on achieving capture power safety with a novel and practical scheme, called capture-power-safe logic BIST (CPS-LBIST). The basic idea is to identify all possibly-erroneous test responses caused by excessive capture power and use the well-known approach of masking (bit-masking, slice-masking,vector-masking) to block them from reaching the multiple-input signature register(MISR). Experiments with large benchmark circuits and a large industrial circuit demonstrate that CPS-LBIST can achieve capture power safety with negligible impact on test quality and circuit overhead.