Nonvolatile memory device, operating method thereof and memory system including the same
First Claim
1. A method of erasing a three dimensional (3D) nonvolatile memory device which includes a first memory cell strings and a second memory cell strings, the first memory cell strings and the second memory cell strings including first memory cells and second memory cells respectively, each of the first and the second memory cells being connected in series and stacked in a direction substantially perpendicular to a substrate, the first memory cell strings being connected to a first string selection line and the second memory cell strings being connected to a second string selection line, at least one of the first memory cells and at least one of the second memory cells being connected to a word line and one of the first memory cell strings and one of the second memory cell strings being connected to a bit-line, the method comprising:
- performing a first erasure operation to first memory cells and the second memory cells by applying a first word line erasure voltage on the word line and applying a first erasure voltage to the substrate;
performing a first erasure verification operation to the first memory cells after the performing the first erasure operation by applying a first erasure verification voltage on the word line;
determining whether the first erasure verification passed or failed after the first erasure verification operation; and
if the first erasure verification is determined to be passed, performing a second erasure verification operation to the second memory cells by applying a second erasure verification voltage on the word line, and if the first erasure verification is determined to be failed, performing a second erasure operation to first memory cells and the second memory cells by applying a second word line erasure voltage on the word line and applying a second erasure voltage to the substrate of the first memory cells and the second memory cells.
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Abstract
A method of operating a non-volatile memory device includes performing an erasing operation to memory cells associated with a plurality of string selection lines (SSLs), the memory cells associated with the plurality of SSLs constituting a memory block, and verifying the erasing operation to second memory cells associated with a second SSL after verifying the erasing operation to first memory cells associated with a first SSL.
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Citations
24 Claims
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1. A method of erasing a three dimensional (3D) nonvolatile memory device which includes a first memory cell strings and a second memory cell strings, the first memory cell strings and the second memory cell strings including first memory cells and second memory cells respectively, each of the first and the second memory cells being connected in series and stacked in a direction substantially perpendicular to a substrate, the first memory cell strings being connected to a first string selection line and the second memory cell strings being connected to a second string selection line, at least one of the first memory cells and at least one of the second memory cells being connected to a word line and one of the first memory cell strings and one of the second memory cell strings being connected to a bit-line, the method comprising:
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performing a first erasure operation to first memory cells and the second memory cells by applying a first word line erasure voltage on the word line and applying a first erasure voltage to the substrate; performing a first erasure verification operation to the first memory cells after the performing the first erasure operation by applying a first erasure verification voltage on the word line; determining whether the first erasure verification passed or failed after the first erasure verification operation; and if the first erasure verification is determined to be passed, performing a second erasure verification operation to the second memory cells by applying a second erasure verification voltage on the word line, and if the first erasure verification is determined to be failed, performing a second erasure operation to first memory cells and the second memory cells by applying a second word line erasure voltage on the word line and applying a second erasure voltage to the substrate of the first memory cells and the second memory cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of erasing a three dimensional (3D) nonvolatile memory device which includes a first memory cell strings and a second memory cell strings, the first memory cell strings and the second memory cell strings including first memory cells and second memory cells respectively, each of the first and the second memory cells being connected in series and stacked in a direction substantially perpendicular to a substrate, the first memory cell strings being connected to a first string selection line and the second memory cell strings being connected to a second string selection line, at least one of the first memory cells and at least one of the second memory cells being connected to a word line and one of the first memory cell strings and one of the second memory cell strings being connected to a bit-line, the method comprising:
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a) performing a first erasure operation to first memory cells and the second memory cells by applying a first word line erasure voltage on the word line and applying a first erasure voltage to the substrate; b) performing a first erasure verification operation to the first memory cells after the performing the first erasure operation by applying a first erasure verification voltage on the word line; c) determining whether the first erasure verification passed or failed after the first erasure verification operation; and if the first erasure verification is determined to be passed, performing a second erasure verification operation to the second memory cells by applying a second erasure verification voltage on the word line, and if the first erasure verification is determined to be failed, adjusting the level of the word line to a ground voltage, and performing a second erasure operation to first memory cells and the second memory cells by applying a second word line erasure voltage on the word line and applying a second erasure voltage to the substrate of the first memory cells and the second memory cells; and d) repeating steps a) to c) until all erasure verification operation being passed so long as a erase count for the first memory cell strings and the second memory cell strings is equal to or less than a predetermined value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification