SEMICONDUCTOR MEMORY DEVICE AND METHOD FOR DRIVING THE SAME
First Claim
1. A semiconductor memory device comprising:
- a plurality of semiconductor members arranged along a first direction and a second direction, the second direction crossing the first direction, and the plurality of semiconductor members extending in a third direction crossing a plane including the first direction and the second direction;
a plurality of electrode members extending in a direction crossing the third direction;
a charge accumulation member provided between the semiconductor member and the electrode member, and the charge accumulation member being capable of accumulating charge;
a memory unit configured to retain information, the information indicating a memory cell belongs to a first group or a second group, the memory cell being formed at each crossing portion of the semiconductor member and the electrode member via the charge accumulation member; and
a control unit configured to perform a first step and a second step when reducing the charge accumulated in the charge accumulation member,the first step, a first voltage being applied both between the semiconductor member and the electrode member constituting the memory cell belonging to the first group and between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the first voltage being such that potential of the electrode member is lower than potential of the semiconductor member, andin the second step, a second voltage being applied between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the second voltage being such that potential of the electrode member is lower than potential of the semiconductor member.
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Accused Products
Abstract
According to one embodiment, a semiconductor memory device includes: semiconductor member; electrode member; charge accumulation member; a memory unit; and a control unit. Memory cell is formed at each crossing portion of the semiconductor member and the electrode member. The memory unit retains information indicating that the memory cell belongs to first group or second group. The control unit performs first step and second step, when reducing the charge accumulated in the charge accumulation member. In the first step, first voltage is applied both between the semiconductor member and the electrode member of the first group and between the semiconductor member and the electrode member of the second group. In the second step, second voltage is applied between the semiconductor member and the electrode member constituting the memory cell belonging to the second group.
7 Citations
14 Claims
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1. A semiconductor memory device comprising:
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a plurality of semiconductor members arranged along a first direction and a second direction, the second direction crossing the first direction, and the plurality of semiconductor members extending in a third direction crossing a plane including the first direction and the second direction; a plurality of electrode members extending in a direction crossing the third direction; a charge accumulation member provided between the semiconductor member and the electrode member, and the charge accumulation member being capable of accumulating charge; a memory unit configured to retain information, the information indicating a memory cell belongs to a first group or a second group, the memory cell being formed at each crossing portion of the semiconductor member and the electrode member via the charge accumulation member; and a control unit configured to perform a first step and a second step when reducing the charge accumulated in the charge accumulation member, the first step, a first voltage being applied both between the semiconductor member and the electrode member constituting the memory cell belonging to the first group and between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the first voltage being such that potential of the electrode member is lower than potential of the semiconductor member, and in the second step, a second voltage being applied between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the second voltage being such that potential of the electrode member is lower than potential of the semiconductor member. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor memory device comprising:
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a plurality of semiconductor members arranged along a first direction and a second direction, the second direction crossing the first direction, and the plurality of semiconductor members extending in a third direction crossing a plane including the first direction and the second direction; a plurality of electrode members extending in a direction crossing the third direction; and a charge accumulation member provided between the semiconductor member and the electrode member, and the charge accumulation member being capable of accumulating charge, a memory cell formed at each crossing portion of the semiconductor member and the electrode member via the charge accumulation member belonging to one of a first group and a second group, and the semiconductor memory device being configured to perform a first step and a second step when reducing the charge accumulated in the charge accumulation member, in the first step, a first voltage being applied both between the semiconductor member and the electrode member constituting the memory cell belonging to the first group and between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the first voltage being such that potential of the electrode member is lower than potential of the semiconductor member, and in the second step, a second voltage being applied between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the second voltage being such that potential of the electrode member is lower than potential of the semiconductor member. - View Dependent Claims (9)
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10. A method for driving a semiconductor memory device, the semiconductor memory device including a plurality of semiconductor members arranged along a first direction and a second direction crossing the first direction and extending in a third direction crossing a plane including the first direction and the second direction, a plurality of electrode members extending in a direction crossing the third direction, and a charge accumulation member provided between the semiconductor member and the electrode member and being capable of accumulating charge, a memory cell being formed at each crossing portion of the semiconductor member and the electrode member via the charge accumulation member, the method comprising:
reducing the charge accumulated in the charge accumulation member, including; a first step configured to apply a first voltage both between the semiconductor member and the electrode member constituting the memory cell belonging to the first group and between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the first voltage being such that potential of the electrode member is lower than potential of the semiconductor member; and a second step configured to apply a second voltage between the semiconductor member and the electrode member constituting the memory cell belonging to the second group, the second voltage being such that potential of the electrode member is lower than potential of the semiconductor member. - View Dependent Claims (11, 12, 13, 14)
Specification