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Layout-aware scan chain synthesis for improved path delay fault coverage

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4 Author(s)
Gupta, P. ; Dept. of Electr. & Comput. Eng., Univ. of California, La Jolla, CA, USA ; Kahng, A.B. ; Mandoiut, I.I. ; Sharma, P.

Path delay fault testing has become increasingly important due to higher clock rates and higher process variability caused by shrinking geometries. Achieving high-coverage path delay fault testing requires the application of scan justified test vector pairs, coupled with careful ordering of the scan flip-flops and/or insertion of dummy flip-flops in the scan chain. Previous works on scan synthesis for path delay fault testing using scan shifting have focused exclusively on maximizing fault coverage and/or minimizing the number of dummy flip-flops, but have disregarded the scan wirelength overhead. In this paper we propose a layout-aware coverage-driven scan chain ordering methodology and give exact and heuristic algorithms for computing the achievable tradeoffs between path delay fault coverage and both dummy flip-flop and wirelength costs. Experimental results show that our scan chain ordering methodology yields significant improvements in path delay coverage with a very small increase in wirelength overhead compared to previous layout-driven approaches, and similar coverage with up to 25 times improvement in wirelength compared to previous layout-oblivious coverage-driven approaches.

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:24 ,  Issue: 7 )