Diversification as a Public Good: Community Effects in Portfolio Choice

A DRAM includes a test mode circuit. Test mode circuit generates respective test mode signals of an L level and an H level by detecting first and second power supply voltages in response to first and second test mode shift signals, respectively. A control circuit controls peripheral circuits to input and output data for executing a special test to and from a plurality of memory cells in response to receiving of the test mode signals of an L level and an H level. Consequently, a semiconductor memory device can enter the test mode in a module.

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