Importance

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Abstract

Upon conduct of a test on a semiconductor memory in a merged LSI or the like, data signals from a small data bus width are simultaneously written to a plurality of memory cells of a memory core. Then, a coincidence detection circuit makes a comparison between data read from the plurality of memory cells in expectation of a coincidence thereof. When the coincidence detection circuit detects the coincidence of the data, a data compression circuit compresses the compared data, and then outputs the compressed data. On the other hand, when the coincidence detection circuit detects an anticoincidence of the data, the data compression circuit converts the different data into fixed data, and then outputs the converted data.

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First Claim