A semiconductor memory device is provided which includes a first port configured to connect to a first processor and including a first interface circuit; a second port configured to connect to a second processor and including a second interface circuit; and a memory cell array including a first memory area connected to the first and second ports in common. The first memory area includes a plurality of magneto-resistive random access memory cells. The first interface circuit is configured to receive a DRAM interface signals, and the second interface circuit is configured to receive a flash memory interface signals.