SEMICONDUCTOR MEMORY DEVICE AND ITS LAYOUT SYSTEM

摘要

PURPOSE:To mask the parallel transfer to a data register in a bit unit, to simplify a memory area to be masked or display area at the read/write time by outputting the mask data provided on a part of memory array to a mask register receiving the data in parallel. CONSTITUTION:The area storing the mask information is provided on the memory array M-ARY and the mask information is transferred between the area and the mask register MR. Further by the output from the memory array M-ARY the parallel transfer to the serial output register SAM is executed to control the validity/invalidity in the bit unit. In such a manner, the memory area or the display area (wind display) masked at the read/write time through the serial input/output circuit is easily formed.