Semiconductor memory device, information processing system including the same, and controller

A system comprising:

• a semiconductor memory device comprises a semiconductor substrate, first and second data input/output terminals each provided on the semiconductor substrate, and first and second memory circuit units each provided on the semiconductor substrate, the first memory circuit unit being activated in response to a first selection signal so that the first memory circuit unit inputs/outputs data from/to the first data input/output terminal and not inputs/outputs data from/to the second data input/output terminal, the second memory circuit unit being activated in response to a second selection signal so that the second memory circuit unit inputs/outputs data from/to the second data input/output terminal and not inputs/outputs data from/to the first data input/output terminal;
• and
• a controller supplying the first and second selection signals to the semiconductor memory device.