| 摘要 |
The extension sector enable signal RS_SEL is a test target control signal for switching a test target between ordinary sectors and redundant sectors. During the test period of redundant sectors, if the defective redundant sector signal RSECF is at a HIGH level (that is, the selected redundant sector is a defective sector), the compulsory signal FMATCH is brought to a HIGH level. The match signal MATCH is forcedly brought to a HIGH level (S 22 ) in compliance with the compulsory signal FMATCH which is at a HIGH level (S 21 :T). And, verification (S 2 a) is skipped for the defective sectors, whereby the address signal for identifying the ordinary memory blocks may be utilized for identification of redundant memory blocks.
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