A Comprehensive Test Compression Scheme based on Precomputed Test Sets
To cope with increasingly rigorous challenges that large scale digital integrated circuit testing is confronted with,a comprehensive compression scheme consisting of test-bit rearrangement algorithm,run-length assignment strategy and symmetrical code is proposed.The presented test-bit rearrangement algorithm can fasten dont-care bits 0s or 1s in every test pattern on one of its end to the greatest extent so as to lengthen end-run blocks and decrease number of short run-lengths.A dynamical dont-care assignment strategy based on run-lengths can be used to specify the remaining dont-care bits after the test-bit rearrangement,which can decrease run-length splitting and maximize length of ruu-lengths.The symmetrical code benefits from long run-lengths and only uses 2 4-bit short code words to identify end-run blocks almost as long as a test pattern,and hence the utilization ratio of code words can be heightened.The presented experiment results show that the proposed comprehensive scheme can obtain very higher data compression ratios than other compression ones published up to now,especially for large scale digital integrated circuits,and considerably decrease test power dissipations.
Terms-Run-length code ruu-length assignment symmetrical code test data compression
Zhijian Tian Fayong Zhao
School of Physics and Electronic Science Fuyang Normal College Fuyang, 236037, China
国际会议
太原
英文
907-913
2012-12-08（万方平台首次上网日期，不代表论文的发表时间）