| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferroelectric substance memory and its accessing method, by which an extremely small size of a cell can be realized and a stable access be ensured without destroying a data. SOLUTION: In a first operation mode, word lines WL11 and WL12 are selected independently, and in a second operation mode, they are selected at the same time, and one bit is stored in a pair of ferroelectric capacitors having commonly plate lines as an electrode. When the data is read out, all data that are stored in the respective capacitors of a cell string CST11 selected in the first operation mode are read out and rewritten successively and in a batch, all data that are stored in the respective capacitors of a second cell string CST12 are read out and rewritten successively and in a batch. In the second operation mode, all data that are stored in the respective capacitor pairs in the first and second strings are read out and rewritten successively and in a batch.
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