| 摘要 |
PROBLEM TO BE SOLVED: To improve read-out speed between different memory cell arrays in a memory system of an overlaid system. SOLUTION: In a memory system of an overlaid system, respective memory cell arrays are activated independently of other memory cell arrays, further, delay of read-out speed by activation of a memory cell array and reset/pre- charge is not caused at the time of read-out between different memory cell arrays by keeping an activation state of respective memory cell arrays.
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