Abstract/Details

Cost reduction and test-quality control for scan-based testing of statistical timing defect


2006 2006

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Abstract (summary)

To reduce the test data volume and the testing application time with limited ATE channels, researchers have shown increasing interest in the areas of input stimulus compression and output response compaction. At the same time, the process variations, various noise sources, and subtle failure mechanisms in sub-90nm technologies result in significant statistical variations to both circuit timing and sizes of timing defects. Such statistical timing variations make test generation for detecting the timing failures substantially more difficult. In this thesis, we address the following two major issues: (1) testing for statistical timing defects; (2) output response compaction with high tolerance to unknown values while reducing the required storage data and shortening the test application time.

For the statistical-timing part, the key focus is to control the computation complexity imposed by the statistical timing models and also provide the accuracy considering all the interactive effects among all probabilistic factors. In this thesis, we first propose an efficient test-generation flow for statistical timing defects. A key component called pattern selection is introduced in this test-generation flow to reduce the size of the test set while maintaining effective detection of statistical timing defects (which is imposed by the process variation). Second, we develop a static statistical timing analyzer for latch-based pipeline designs. This timing analyzer can report the structural circuit-timing criticality considering the correlations of critical-timing events both inside the pipeline stages and across the pipeline stages.

For the test-response compaction part, the key focus is to tolerate unknown values among the test responses while achieving maximal compaction ratio. First, we introduce a DFT module, named 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 undetectable modeled and un-modeled faults in the presence of unknown values. Second, we propose a novel response compactor, named ChiYun compactor, to compact scan-out responses in the presence of unknown values. By adding storage elements into an Xor network, a ChiYun compactor can offer multiple chances for a scan-out response to be observed at ATE channels in several scan-shift cycles. Third, we develop a mathematical framework to analyze the unknown tolerance of a space compactor based on its modeled-fault coverage or n-detection metric. With this analysis, we further propose a design flow to construct a space compactor with maximal compaction ratio and desired level of test quality. Last, we propose a hybrid compaction scheme using a space compactor along with an unknown-blocking time compactor. This hybrid scheme can guarantee the same modeled-fault coverage as no compaction scheme is applied and also observe a desired percentage of scan-out responses.

Indexing (details)


Subject
Electrical engineering;
Computer science
Classification
0544: Electrical engineering
0984: Computer science
Identifier / keyword
Applied sciences; Cost reduction; Scan-based; Statistical timing; Testing
Title
Cost reduction and test-quality control for scan-based testing of statistical timing defect
Author
Chao, Mango Chia-Tso
Number of pages
207
Publication year
2006
Degree date
2006
School code
0035
Source
DAI-B 67/08, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780542855870
Advisor
Cheng, Kwang-Ting
University/institution
University of California, Santa Barbara
University location
United States -- California
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3232988
ProQuest document ID
305355035
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305355035
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