| 摘要 |
PURPOSE:To write simultaneously a prescribed data to all memory cells by controlling each decoder of a row and a column by a memory clear signal, selecting all word lines and bit lines, and bringing a writing circuit to a write control. CONSTITUTION:In case a memory clear signal is applied to a terminal 51, all word lines 4... are selected by a row decoder 52, all columns are selected by a column decoder 53, and all memory cells 8... become a selected state. Subsequently, a write control circuit 54 is operated by a memory clear signal, and a prescribed write data from a data input/output circuit 55 is written simultaneously in all the memory cells 8... through all pairs of bit lines 5, -5 by writing circuits 10.... |
