| 摘要 |
PURPOSE:To clear all of the data at high speed, by constituting a shift register or a data register in a memory cell array with a flip-flop capable of being set/reset, and enabling all of the bits of the register to be reset or set simultaneously by a control signal. CONSTITUTION:The shift register 8 is constituted of the flip-flops capable of being reset simultaneously by the control signal supplied from the outside. After all of the bits of the shift register 8 are reset by the control signal RES, the data of the shift register 8 are transferred comprehensively to memory cell rows selected by a row address decoder 3. Afterwards, the data of the shift register 8 are transferred to all of the memory cell rows changing row addresses one by one. In such way, it is possible to clear all of the data in the memory cell array in a short time.
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