A semiconductor memory module includes data buffers that exchange first data signals with an external device, nonvolatile memory devices that are respectively connected to the data buffers through data lines, and a controller connected to the data lines. The controller receives an address, a command, and a control signal from the external device, and depending on the address, the command, and the control signal, the controller controls the data buffers through first control lines and controls the nonvolatile memory devices through second control lines.