An Efficient Unknown Blocking Scheme for Low Control Data Volume and High Observability

Wang, Seongmoon; Wei, Wenlong

doi:10.1109/tcad.2008.2006093

Cited by 7 publications

(2 citation statements)

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“…To achieve a smaller observation ratio, the proposed output selection logic can also utilize a MISR to deal with all the outputs of the multiplexers as a mixed-mode compactor [5,7]. Suppose an eight-bit MISR is combined with an eight-output output selection scheme for the circuit b17 such that only one eight-bit signature is stored for each applied pattern.…”

Section: Resultsmentioning

confidence: 99%

“…However, these schemes suffer from aliasing, unknown response (X) values, and poor diagnosability [1]. Many innovative solutions such as zero-aliasing [2][3], X-blocking [4][5], X-handling [6], X-masking [7], X-press [8], X-impact [9] and X-compact [3] have been proposed to address these problems. These methods are mainly focused on masking out the effects of unknown values.…”

Section: Introductionmentioning

confidence: 99%

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Accumulator-based output selection for test response compaction

Lien

Lee

Hsieh

et al. 2012

2012 IEEE International Symposium on Circuits and Systems

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Output selection is a recently proposed test response compaction method, where only a subset of output response bits is selected for observation. It can achieve zero aliasing, full X-tolerance, and high diagnosability. We propose an output selection scheme for multiple scan designs, which employs only accumulators and multiplexers, and thus involves small area overhead and simple test control. An efficient selection procedure is presented to determine a minimal test set and the corresponding output bits to select for complete fault coverage. Experimental results show that when only one accumulator and one multiplexer are employed, 100% single stuck-at fault coverage for ISCAS'89 (ITC'99) circuits can be achieved by observing only 9.84% (8.19%) of the test response bits with only 1.86% (1.18%) area overhead.

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Section: Resultsmentioning

confidence: 99%