MEMORY, MEMORY CONTROLLER, MEMORY SYSTEM, METHOD OF MEMORY, MEMORY CONTROLLER AND MEMORY SYSTEM
First Claim
1. A method of operating a memory controller, comprising:
- performing a read operation on a memory;
determining, by a memory controller, whether to perform a reliability verification read operation based on a count value and a reference value, the count value being based on a number of read commands issued by the memory controller to the memory, and the reliability verification read operation for reading data from at least one memory cell associated with at least one unselected word line in the memory, the unselected word line being a word line not selected during the read operation; and
performing the reliability verification read operation for the at least one unselected word line based on the determining.
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Accused Products
Abstract
In one embodiment, the method includes performing a read operation on a memory, and determining, by a memory controller, whether to perform a reliability verification read operation based on a count value and a reference value. The count value is based on a number of read commands issued by the memory controller to the memory, and the reliability verification read operation is for reading data from at least one memory cell associated with at least one unselected word line in the memory. An unselected word line is a word line not selected during the read operation. The method further includes performing the reliability verification read operation for the at least one unselected word line based on the determining.
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Citations
66 Claims
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1. A method of operating a memory controller, comprising:
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performing a read operation on a memory; determining, by a memory controller, whether to perform a reliability verification read operation based on a count value and a reference value, the count value being based on a number of read commands issued by the memory controller to the memory, and the reliability verification read operation for reading data from at least one memory cell associated with at least one unselected word line in the memory, the unselected word line being a word line not selected during the read operation; and performing the reliability verification read operation for the at least one unselected word line based on the determining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A memory controller, comprising:
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a counter configured to generate a count value based on a number of read commands issued by the memory controller to a memory; a read controller configured to perform a read operation, configured to determine whether to perform a reliability verification read operation based on the count value and a reference value, and the reliability verification read operation for reading data from at least one memory cell associated with at least one unselected word line in the memory, the unselected word line being a word line not selected during the read operation; and the read controller configured to performing the reliability verification read operation for the at least one unselected word line based on the determination. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A memory system, comprising:
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at least one memory; and a memory controller configured to control the memory, the memory controller configured to determine whether to perform a reliability verification read operation based on a count value and a reference value, the count value being based on a number of read operations performed by the memory controller on the memory, and the reliability verification read operation for reading data from at least one memory cell associated with at least one unselected word line in the memory, the unselected word line being a word line not selected during a read operation; and the memory controller configured to perform the reliability verification read operation for the at least one unselected word line based on the determining. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A method of operating a nonvolatile memory system, comprising:
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performing a read operation on nonvolatile memory cells connected to a selected wordline in a selected block in a nonvolatile memory device; determining, by a memory controller, whether to perform a reliability verification read operation based on a count value and a reference value, the count value being based on a number of read commands issued by the memory controller to the nonvolatile memory, and the reliability verification read operation for reading threshold voltage distributions from at least one of the nonvolatile memory cells associated with at least one unselected wordline in the selected block, the unselected wordline being a wordline not selected during the read operation and not programmed after an erase operation; and performing the reliability verification read operation for the at least one unselected wordline based on the determining. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. A method of operating a nonvolatile memory system, comprising:
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performing a read operation on nonvolatile memory cells connected to a selected wordline in a selected block in a nonvolatile memory device; performing a reliability verification read operation, the reliability verification read operation for reading data from at least one of the nonvolatile memory cells with at least one unselected wordline in the selected block, the unselected wordline being a wordline not selected during the read operation; and determining whether performing a post-process for the selected block based on a result of the reliability verification read operation. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66)
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Specification