| 摘要 |
PROBLEM TO BE SOLVED: To reduce unnecessary power consumption by preventing addresses and data to be accessed from being inputted to all memory blocks, and to reduce a chip area by shortening a decoding time in each memory block. SOLUTION: Only the upper bits of an address to be accessed are decoded, and a memory block to be made active is designated. Therefore, only a low order address is inputted as an address to be applied to the memory block so that a processing speed can be quickened. Also, only the specific memory block is activated so that charging and discharging currents can be suppressed, and that power consumption can be reduced. Moreover, the upper bits of the address decoders which are conventionally owned by all memory blocks are processed by one decoder in a batch so that only the address decoder of the lower bits can be constituted at the memory block side, and that a chip area can be reduced.
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