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Referenceless Signature Testing Using Bi-Directional LFSR

Eiji FUJIWARA

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Summary :

This paper proposes a unique type of signature testing for VLSIs, called referenceless signature testing. This testing automatically produces a reference value, i.e., correct signature, during its test intervals and compares it with compacted output of the circuit under test, i.e., signature. This makes testing much easier because it does not need the reference value, usually pre-calculated by simulation. This paper also proposes an extended form of this testing which offers economical and highly accurate one by using by-directional LFSRs for RAMs and sequential circuits. The proposed approach is successfully applied to these circuits, because the reference value can be automatically produced with their store operations and bi-directional input sequences for test data. An application of this testing to self-dual combinational circuits is also demonstrated in this paper.

Publication
IEICE TRANSACTIONS on transactions Vol.E71-E No.10 pp.1013-1022
Publication Date
1988/10/25
Publicized
Online ISSN
DOI
Type of Manuscript
PAPER
Category
Fault Tolerant Computing

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