An object is to realize high-capacity of a memory while reducing power consumption and making the power consumption even throughout the memory. A memory includes a plurality of memory block arranged to be symmetrically to each other. Also, a specific combination of signals among address signals supplied to the memory, a memory block including a memory cell to be read from or written to is specified. Further, signals supplied to other memory blocks than the above memory block is maintained at a constant value. Consequently, a wiring length of a bit line in a memory array can be shortened, and current consumption can be made to be even among data reading or writing from/to memory cells of a variety of addresses within the memory, at the same time as reducing load capacitance.

 
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