| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a semiconductor memory device for averaging the number of deleting or writing times in each block of a memory, and suppressing data deterioration with time or caused by reading disturbance in the averaging operation. <P>SOLUTION: The semiconductor memory device is provided with: a NAND memory which has a plurality of blocks containing a plurality of memory cells, in which addresses are allocated for each of the blocks and data are deleted for the blocks, and which stores an LRU table indicating time-sequential data showing the writing order of blocks where data have been written; a RAM for temporarily storing second data stored in the oldest block among the time-sequential data when first data are written in a first logical address corresponding to the first block; and an MPU for replacing a first logical address with a second logical address indicating the oldest block, writing the first data in the oldest block, and writing the second data in the first block. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
