| 摘要 |
<p>PURPOSE:To make possible bi-directional Read of the longitudinal direction Read and the horizontal direction Read with one kind of a mask ROM, to make low-priced and to improve the performance by incorporating a selection circuit to read the longitudinal direction and the horizontal direction in the memory LSI. CONSTITUTION:The address information inputted through terminals A0-A14 is supplied through an address buffer 31 to a row decoder 32 and a column decorder 330 respectively. If a control signal supplied through a Col terminal is ''true'' and then, the column scanning address driver 331 drives the output of the column decoder 330. On the other hand, the output of a row scanning address driver 332 becomes ''0'' and turns off all the row scanning transfer gates (circle marks) which constructs a selection circuit 333. Reversely, the control signal supplied is ''false'' and then, the output of the driver 331 becomes ''0'', and all the gate of a memory matrix cell 34 are turned off. On the other hand, the driver 332 drives the output of the decoder 330.</p> |
