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Effective IR-drop reduction in at-speed scan testing using distribution-controlling X-Identification

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9 Author(s)
Miyase, K. ; Kyushu Inst. of Technol., Iizuka ; Noda, K. ; Ito, H. ; Hatayama, K.
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Test data modification based on test relaxation and X-filling is the preferable approach for reducing excessive IR-drop in at-speed scan testing to avoid test-induced yield loss. However, none of the existing test relaxation methods can control the distribution of identified donpsilat care bits (X-bits), thus adversely affecting the effectiveness of IR-drop reduction. In this paper, we propose a novel test relaxation method, called Distribution-Controlling X-Identification (DC-XID), which controls the distribution of X-bits identified from a set of fully-specified test vectors for the purpose of effectively reducing IR-drop. Experimental results on large industrial circuits demonstrate the effectiveness and practicality of the proposed method in reducing IR-drop, without any impact on fault coverage, test data volume, or test circuit size.

Published in:

Computer-Aided Design, 2008. ICCAD 2008. IEEE/ACM International Conference on

Date of Conference:

10-13 Nov. 2008