| 摘要 |
PROBLEM TO BE SOLVED: To refresh data in a DRAM cache memory in a computer system without generating disadvantage (e.g. delay in a processor). SOLUTION: When a desired address outputted from the processor is detected, a normal refreshing operation is stopped, the desired address is compared with a TAG address stored in a TAG memory 192 and selected by the processor, a refresh address to be generated on the basis of the oldness of data is generated in order to refresh data stored in the cache memory, reading/writing operation for a word line accessed by the desired address is executed, and data on the word line accessed by the refresh address are refreshed to execute the data refreshing operation of the DRAM cache memory. In this case, the reading/ writing operation and the data refreshing operation are simultaneously executed.
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