Semiconductor memory device and method of operating the same
First Claim
1. A method of operating a semiconductor memory device including memory cells having a first to fourth middle states corresponding to different threshold voltage distributions, the method comprising:
- performing a first sub program so that memory cells having the third and the fourth middle states have four upper states; and
performing a second sub program so that memory cells having the first and the second middle states have another four upper states.
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Accused Products
Abstract
A semiconductor memory device is provided. The semiconductor memory device includes memory cells having first to fourth middle states corresponding to different threshold voltage distributions. The semiconductor memory device also includes a peripheral circuit configured to perform a first program operation to program memory cells having the third and the fourth middle states to have four upper states and perform a second program operation to program memory cells having the first and the second middle states to have another four upper states.
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Citations
18 Claims
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1. A method of operating a semiconductor memory device including memory cells having a first to fourth middle states corresponding to different threshold voltage distributions, the method comprising:
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performing a first sub program so that memory cells having the third and the fourth middle states have four upper states; and performing a second sub program so that memory cells having the first and the second middle states have another four upper states. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor memory device comprising:
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memory cells, the memory cells having first to fourth middle states corresponding to different threshold voltage distributions; and a peripheral circuit configured to; perform a first sub program operation to program memory cells having the third and the fourth middle states to have four upper states; and perform a second sub program operation to program memory cells having the first and the second middle states to have another four upper states. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification