Patent ID: 11948636
Assignee: KIOXIA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 17:
18. A memory device comprising:
a memory string including a resistance change portion extending in a first direction, a semiconductor portion extending in the first direction and including a first portion provided along the resistance change portion, and a plurality of conductive layers arranged to be apart from each other in the first direction and arranged along the semiconductor portion, the memory string including a plurality of cell transistors each including at least a part of one of the conductive layers and a part of the semiconductor portion, and a plurality of resistance change memory elements provided to correspond to the cell transistors, respectively, and each including a part of the resistance change portion; and
a control circuit controlling an operation for the memory string,
wherein
the memory string includes a plurality of memory cells connected in series, each of the memory cells including one of the cell transistors and one of the resistance change memory elements corresponding to the one of the cell transistors, which are connected in parallel,
when setting a desired resistance state to one of the resistance change memory elements, the control circuit sets one of the cell transistors provided to correspond to the one of the resistance change memory elements to an off state and sets the cell transistors other than the one of the cell transistors to an on state, and
the control circuit sets three or more resistance values to one of the resistance change memory elements by controlling a current flowing through the memory string.