| 摘要 |
PURPOSE:To achieve clear operation in a short time, by providing a programmable register and obtaining a signal of chip individual selection or chip full selection, in a write operation to a memory consisting of a plurality of chips. CONSTITUTION:A memory MEM consists of a plurality of chips CP1, CP2... and is provided with chip selecting terminals SEL1, SEL2.... A programmable register PGR enables an output signals to be suitably programmed with a control signal from an address bus ADB. For example, when a prescribed control signal is inputted, and when output signals of a register all go to 1 and are applied to the terminals SEL1, SEL2..., if a signal on the data bus ADB is zero, all zero is written in a memory quickly. A register PGR is controlled to select a chip with a prescribed pattern and a signal on the bus DB goes to 1, then 1 is wirtten in a selected chip. Thus, the same signal is written in all the chips of the memory in a short time. |
