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A low transition test pattern generator, called LT-LFSR, is proposed to reduce the average and peak power of a circuit during test by reducing the transitions among patterns. Transitions are reduced in two dimensions; 1) between consecutive patterns (fed to a combinational only circuit) and 2) between consecutive bits (sent to a scan chain in a sequential circuit). LT-LFSR is independent of circuit under test and flexible to be used in both BIST and scan-based BIST architectures. The proposed architecture reduces the correlation among the patterns generated by LT-LFSR with negligible impact on test length. The experimental results for ISCAS'85 and '89 benchmarks confirm up to 77% and 49% reduction in average and peak power, respectively.
Built-in tests, Test generation, Low power pattern generation, Random generation, Testing strategies

N. Ahmed, M. Tehranipoor and M. Nourani, "Low-Transition Test Pattern Generation for BIST-Based Applications," in IEEE Transactions on Computers, vol. 57, no. , pp. 303-315, 2007.
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