Efficient testing methodologies for conditional sum adders

Jin Fu Li, Chih Chiang Hsu

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


This paper presents efficient testing methodologies for conditional sum adders. A conditional sum adder consists of conditional cells and selection cells. We propose a design-for-testability (DFT) technique to modify the conditional cells of a conditional sum adder. Then a test scheme is used for detecting the conditional sum adder with single cell fault model (CFM). The proposed test scheme only needs very low test complexity to test a conditional sum adder. For example, the number of test patterns for a 64-bit conditional sum adder is only 9. The ratio of the number of test patterns of the proposed test scheme to the number of the test patterns of the previous scheme [1] is only about 1%. Also, experimental results show that the area overhead is only about 2.8% for a 64-bit conditioal sum adder with the DFT scheme.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalProceedings of the Asian Test Symposium
StatePublished - 2004
EventProceedings of the Asian Test Symposium, ATS'04 - Kenting, Taiwan
Duration: 15 Nov 200417 Nov 2004


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