SEMICONDUCTOR MEMORY DEVICE AND SEMICONDUCTOR DEVICE

PROBLEM TO BE SOLVED: To provide a semiconductor memory device capable of performing each verify operation after two kinds of write operations having different voltage application polarities to a variable resistance element at low power consumption and high speed.SOLUTION: The semiconductor memory d...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: SEKO AKIYOSHI, ISHIHARA KAZUYA, NAGURA MITSURU, AWAYA NOBUYOSHI
Format: Patent
Sprache:eng
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide a semiconductor memory device capable of performing each verify operation after two kinds of write operations having different voltage application polarities to a variable resistance element at low power consumption and high speed.SOLUTION: The semiconductor memory device comprises: a write circuit 22; and a read circuit 21. The write circuit 22 is configured to perform: a set operation of reducing electric resistance of the variable resistance element by causing current to flow from one end side of a memory cell to the other end side of the memory cell via the variable resistance element; and a reset operation of increasing the electric resistance of the variable resistance element by causing current to flow from the other end side of the memory cell to the one end side of the memory cell via the variable resistance element. The read circuit 21 is configured to perform: a first read operation of reading a resistance state of the variable resistance element by causing current to flow from one end side of the memory cell to the other end side of the memory cell via the variable resistance element; and a second read operation of reading a resistance state of the variable resistance element by causing current to flow from the other end side of the memory cell to the one end side of the memory cell via the variable resistance element.