| 摘要 |
PURPOSE:To realize reduction and expansion of a pit aggregate, by nullifying a part of cell at the time of rearranging the cell by an arranging means. CONSTITUTION:A memory cell is divided into memory cell blocks of (n rows Xm columns) and a row selecting means RD at the memory cell block and a column selecting means CD at the memory cell block are provided commonly respectively. Also, a first switching means RSW supplies a row address AR or a row address AR+1 adjacent to the low address on each row selecting means, and a second switching means CSW supplies a column address AC or the column address AC+1 adjacent to the column address on each column selecting means. And the arranging means rearranges the (n X m)-number of cells of each memory cell block accessed by each row and column selection means. Therefore, it is possible to perform the access of a desired rectangular shape pit aggregate. In such a way, it is possible to easily perform the reduction and the expansion of the shape of the pit aggregate being accessed.
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