X-Tolerant Test Data Compression for SOC with Enhanced Diagnosis Capability

Gang ZENG  Hideo ITO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E88-D   No.7   pp.1662-1670
Publication Date: 2005/07/01
Online ISSN: 
DOI: 10.1093/ietisy/e88-d.7.1662
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Dependable Computing
Keyword: 
SOC testing,  test cost reduction,  test data compression,  unknown state,  test diagnosis,  

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Summary: 
In this paper, a complete X-tolerant test data compression solution is proposed for system-on-a-chip (SOC) testing. The solution achieves low-cost testing by employing not only selective Huffman vertical coding (SHVC) for test stimulus compression but also MISR-based time compactor for test response compaction. Moreover, the solution is non-intrusive, since it can tolerate any number of unknown states (also called X state) in test responses such that it does not require modifying the logic of core to eliminate or block the sources of unknown states. Furthermore, the solution achieves enhanced diagnosis capability over conventional MISR. The enhanced diagnosis requires the least hardware overhead by reusing the existing masking logic and achieves significant saving in diagnostic time. Experimental results for ISCAS 89 benchmarks as well as the evaluation of hardware implementation have proven the efficiency of the proposed test solution.