| 摘要 |
PURPOSE:To initialize the memory cells easily and in a short time regardless of the memory capacity by selecting all the addresses of the memory cells of an RAM simultaneously and initialize by writing the same value. CONSTITUTION:When the control signal S is made H, the outputs A1-An of the OR-gate 4 of the row address control circuit become H regardless of the address decode signal a1-an. The outputs of the OR-gate 5 of the column address control circuit also become H. The outputs of the NOR-gate 6 of the write control circuit become L regardless of write data DA. When the write enable signal WE becomes H, L is written in all the memory cells of the RAM, and initialize them in cleared status. The initialization of the RAM in H-level is performed likewise, and eliminates a complicated reset circuit and the likes. Thus the memory cells of the RAM built in the memory device of IC are easily and briefly initialized regardless of the memory capacity. |
