| 摘要 |
PROBLEM TO BE SOLVED: To set a refresh region, to be refreshed actually, from the outside of a DRAM. SOLUTION: A refresh control register 21 is installed in such a way that a refresh control bit which is given from the outside and which indicates a region to be refreshed is stored. A refresh-address judgment circuit 22 is installed in such a way that a content RCB which is stored in the refresh control register 21 is compared with a refresh address RAi which is output by a refresh address generation circuit 11. An internal timing control circuit 5A stops the operation of a row decoder 3 and that of a sense amplifier 4 according to the judgment result of the refresh-address judgment circuit 22.
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