Test Data Compression for Scan-Based BIST Aiming at 100x Compression Rate

Masayuki ARAI  Satoshi FUKUMOTO  Kazuhiko IWASAKI  Tatsuru MATSUO  Takahisa HIRAIDE  Hideaki KONISHI  Michiaki EMORI  Takashi AIKYO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E91-D   No.3   pp.726-735
Publication Date: 2008/03/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e91-d.3.726
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Test and Verification of VLSIs)
Category: Test Compression
Keyword: 
test data compression,  test response compaction,  BIST-aided scan test,  X-value,  ATPG,  

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Summary: 
We developed test data compression scheme for scan-based BIST, aiming to compress test stimuli and responses by more than 100 times. As scan-BIST architecture, we adopt BIST-Aided Scan Test (BAST), and combines four techniques: the invert-and-shift operation, run-length compression, scan address partitioning, and LFSR pre-shifting. Our scheme achieved a 100x compression rate in environments where Xs do not occur without reducing the fault coverage of the original ATPG vectors. Furthermore, we enhanced the masking logic to reduce data for X-masking so that test data is still compressed to 1/100 in a practical environment where Xs occur. We applied our scheme to five real VLSI chips, and the technique compressed the test data by 100x for scan-based BIST.