Patent ID: 8730742

Claim:
A device, comprising: a first terminal which receives an external clock signal; a clock generation circuit which is connected to the first terminal and generates an internal clock signal based on the external clock signal; a plurality of word lines and a plurality of bit lines; a plurality of amplifier circuits which is connected to the plurality of bit lines, respectively; and a control unit which controls, in a test operation, at least one word line of the plurality of word lines to repeat a selected state and an unselected state in accordance with the internal clock signal during a first period, and maintains the plurality of amplifier circuits in an active state during the first period, and controls, in a normal operation, the plurality of amplifier circuits to switch between the active state and an inactive state depending on switching between the selected state and the unselected state of the at least one word line of the plurality of word lines, wherein the control unit performs a selection control of the plurality of word lines and an activation control of the plurality of amplifier circuits based on control signals supplied from outside.