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Journal of Information Science and Engineering, Vol. 27 No. 6, pp. 1943-1957 (November 2011)

A Generic Multi-Dimensional Scan-Control Scheme for Test-Cost Reduction

Department of Electronics Engineering
National Chiao Tung University
Hsinchu, 300 Taiwan

This paper proposes a generic multi-dimensional scan shift control concept for multiple scan chain design. Multiple scan chain test scheme provides very low scan power by skipping (selectively load/unload) many long scan chain switching activities. Based on the two-dimensional scan shift control, we can achieve low test power with simple and small overhead structure. We can further extend the scheme to a generic N dimension test scheme. The proposed scheme skips many unnecessary don't care (X) patterns to reduce the test data volume and test time. The experimental results of the proposed 2-D scheme achieve significant improvement in shift power reduction, test volume and test time reduction. Compared with traditional single scan chain design, the large benchmark b17 of ITC'99 has over 50% reduction in test data volume and over 40% reduction in test time with little area overhead, around 1% routing overhead, and the power reduction is over 97%.

Keywords: DFT, low power, scan chain, compression, test data volume

Full Text () Retrieve PDF document (201111_10.pdf)

Received March 3, 2010; revised July 21, 2010; accepted September 7, 2010.
Communicated by Yao-Wen Chang.