An easy linear-compression test pattern generation method(LCG)is proposed to solve the problems of data volume
power and fault detection in VLSI test. Unlike traditional test generation methods
LCG method extracts a class of test sequences with linear relationships existing in each vector. The linear relationships are based on single input change sequences
and the resulting test sequence can effectively reduce switching activities in a CUT(circuit under test). During test pattern generation
LCG method finds values only for a small portion of the bits of a test vector
and values for other bits of the test vector are assigned according to the predefined linear relationships. Test patterns are justified by fault simulations. The compressed test pattern consists of the small portion of the bits of the original pattern. Therefore
the proposed LCG method has features of high compression ratio
easy implementation
low power and high fault coverage. Experimental results on the five largest ISCAS89 benchmarks show that the LCG method achieves stuck-at fault coverage more than 96%
and test compression ratios over 10 times for all benchmarks
and even 100 times for some benchmarks.
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references
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