VARIABLE-RESISTANCE MEMORY DEVICE AND DRIVING METHOD THEREOF

摘要

A variable-resistance memory device includes a memory array section including a main memory cell employing a storage element having a resistance increasing and decreasing in a reversible manner in accordance with application of a signal set at one of different polarities to the opposite ends of the storage element, and a reference cell section including a reference cell provided with a storage element having a resistance increasing and decreasing in a reversible manner in accordance with application of a signal set at one of different polarities to the opposite ends of the storage element and generating a reference current used for recognizing data of the main memory cell. The direction of an applied current serving as the reference current is set in accordance with the resistance state of the reference cell.