Response shaper: A novel technique to enhance unknown tolerance for output response compaction

Chia-Tso Chao*, Seongmoon Wang, Srimat T. Chakradhar, Kwang Ting Cheng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

36 Scopus citations


The presence of unknown values in the simulation result is a key barrier to effective output response compaction in practice. This paper proposes a simple circuit module, called a response shaper, to reshape the scan-out responses before feeding them to a space compactor. Along with the proposed reshaping algorithm, response shapers can help the space compactor to reduce the number of un-detectable modeled and un-modeled faults in the presence of un-known values. Moreover, the proposed compaction scheme is ATPG-independent and its hardware requirement is pattern-independent. In our experiments, we use a simple XOR compactor as the space compactor to evaluate the effectiveness of the response shaper. The results show that the number of undetectable faults and unobservable scan-out responses can be significantly reduced in comparison with the results of a convolutional compactor. The number of the extra scan-in bits required for the control signals of the response shapers is only a small fraction of the total test data volume. Also, its hardware overhead is acceptable and the runtime of the reshaping algorithm is scalable for large industrial designs.

Original languageEnglish
Title of host publicationProceedings of theICCAD-2005
Subtitle of host publicationInternational Conference on Computer-Aided Design
Number of pages8
StatePublished - 1 Dec 2005
EventICCAD-2005: IEEE/ACM International Conference on Computer-Aided Design, 2005 - San Jose, CA, United States
Duration: 6 Nov 200510 Nov 2005

Publication series

NameIEEE/ACM International Conference on Computer-Aided Design, Digest of Technical Papers, ICCAD
ISSN (Print)1092-3152


ConferenceICCAD-2005: IEEE/ACM International Conference on Computer-Aided Design, 2005
CountryUnited States
CitySan Jose, CA

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