| 摘要 |
<p>PURPOSE:To enable readout to be executed even during write by performing a write operation after storing a write address and write data, and executing a readout operation preferentially by interrupting the write when a readout command is issued during the write. CONSTITUTION:When a read/write signal R/W to be inputted to a control circuit 18 is set at a write state, a cell array 11 corresponding to an address AD is selected, and also, the address AD is stored in an address memory circuit 15. Next, data DA is held at a data memory circuit 17, and the write operation is performed. When the signal R/W is set at a read state during the write, the circuit 18 interrupts the impression of a write voltage transiently, and performs a readout operation. On completing the readout, the circuit 18 reads out the address from the circuit 15, and restarts the impression of the write voltage based on the data in the circuit 17. In such a way, it is possible to perform the readout of the data even during the write operation, and to always utilize the data stored in a P-ROM.</p> |
