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Static test compaction for mixed broadside and skewed-load transition fault test sets

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1 Author(s)
Pomeranz, I. ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA

Test sets that consist of both broadside and skewed-load tests provide improved delay fault coverage for standard-scan circuits. This study describes a static test compaction procedure for such test sets. The unique feature of the procedure is that it can modify the type of a test (from broadside to skewed-load or from skewed-load to broadside) if this contributes to test compaction. Given a test set W, the basic static test compaction procedure described in this study considers for inclusion in the compacted test set both a broadside and a skewed-load test based on every test wW. It selects the test type that detects the higher number of faults. An improved procedure considers a broadside and a skewed-load test based on a test wW only if w detects a minimum number of faults (without changing its type). Experimental results demonstrate that the static test compaction procedure is typically able to reduce the sizes of mixed test sets further than a procedure that does not modify test types. The procedure modifies the types of significant numbers of tests before including them in the compacted test set.

Published in:

Computers & Digital Techniques, IET  (Volume:7 ,  Issue: 1 )