Resistive memory device including a buffer memory, memory system including the resistive memory device, and data write/read method for resistive memory device

A resistive memory device including a buffer memory, a memory system including the resistive memory device and a method for writing/reading data of the resistive memory device are provided to reduce overhead of a memory controller. According to a resistive memory device, a buffer memory(310) stores input data temporarily, in response to a write address signal and a write command signal. A memory core part(400) includes a resistive memory cell. The resistive memory cell stores input data provided from the buffer memory, in response to the write address signal and the write command signal. A control logic part(315) generates the write address signal, the write command signal, a read address signal and a read command signal in response to an address signal and a command signal transmitted from a memory controller(200). The read address signal and the read command signal are related with data read operation of the resistive memory device.