Generalized Marching Test for Detecting Pattern Sensitive Faults in RAMs

Masahiro HASHIMOTO, Eiji FUJIWARA

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Summary :

Since semiconductor memory chip has been growing rapidly in its capacity, memory testing has become a crucial problem in RAMs. This paper proposes a new RAM test algorithm, called generalized marching test (GMT), which detects static and dynamic pattern sensitive faults (PSF) in RAM chips. The memory array with N cells is partitioned into B sets in which every two cells has a cell-distance of at least d. The proposed GMT performs the ordinary marching test in each set and finally detects PSF having cell-distance d. By changing the number of partitions B, the GMT includes the ordinary marching test for B1 and the walking test for BN. This paper demonstrates the practical GMT with B2, capable of detecting PSF, as well as other faults, such as cell stuck-at faults, coupling faults, and decoder faults with a short testing time.

Publication
IEICE TRANSACTIONS on Information Vol.E76-D No.7 pp.809-816
Publication Date
1993/07/25
Publicized
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Type of Manuscript
Special Section PAPER (Special Issue on VLSI Testing and Testable Design)
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