摘要:
A nonvolatile random access memory device includes a plurality of memory cells configured to store data therein, a plurality of reference cells separate from the memory cells, the reference cells each configured to output a corresponding reference cell signal, and a read/write circuit. The read/write circuit is configured to generate from the reference cell signals a reference signal which is variable to have a plurality of different reference levels. The read/write circuit is further configured to identify, in response to the reference signal, a logic state among a first logic state and a second logic state for each of one or more selected memory cells, and to output read data corresponding to the identified logic state.
摘要:
A data management method of a nonvolatile memory device which includes a data cell area and a reference cell area includes selecting shared data from write data input to the memory device; generating reference data based on the shared data; and storing the write data in the data cell area and a first reference area of the reference cell area; and storing the reference data in a second reference area of the reference cell area.
摘要:
Methods of operating nonvolatile memory devices including a plurality of cell strings each having at least one ground selection transistor, a plurality of memory cells, and at least one string selection transistor, the operating methods including receiving a command and an address, determining a voltage applying time in response to the input command and address, and applying a specific voltage to memory cells of cell strings corresponding to the input address during the determined voltage applying time.
摘要:
A method of operating a nonvolatile memory device configured to erase a memory block in sub-block units comprises detecting state information of unselected sub-blocks associated with a selected sub-block comprising selected memory cells, adjusting a read bias of the selected memory cells based on the state information, and reading data from the selected memory cells according to the adjusted read bias. The state information indicates a number of the unselected sub-blocks having a programmed state or an erased state.
摘要:
Methods of operating nonvolatile memory devices including a plurality of cell strings each having at least one ground selection transistor, a plurality of memory cells, and at least one string selection transistor, the operating methods including receiving a command and an address, determining a voltage applying time in response to the input command and address, and applying a specific voltage to memory cells of cell strings corresponding to the input address during the determined voltage applying time.
摘要:
A method of operating a memory system including a nonvolatile memory including a memory block, and a memory controller including an erase control unit, includes performing pre-reading a plurality of memory cells connected to a selected word line of the memory block, generating an off cell count based on the pre-reading result, by operation of the erase control unit, comparing the off cell count with a reference value to generate a comparison result, and changing an erase operation condition based on the comparison result, by operation of the nonvolatile memory, and erasing the memory block according to the changed erase operation condition.
摘要:
A method of operating a memory system including a nonvolatile memory including a memory block, and a memory controller including an erase control unit, includes performing pre-reading a plurality of memory cells connected to a selected word line of the memory block, generating an off cell count based on the pre-reading result, by operation of the erase control unit, comparing the off cell count with a reference value to generate a comparison result, and changing an erase operation condition based on the comparison result, by operation of the nonvolatile memory, and erasing the memory block according to the changed erase operation condition.
摘要:
A storage device is provided as follows. A nonvolatile memory device includes blocks, each block having sub-blocks erased independently. A memory controller performs a garbage collection operation on the nonvolatile memory device by selecting a garbage collection victim sub-block among the sub-blocks and erasing the selected garbage collection victim sub-block to generate a free sub-block. The memory controller selects the garbage collection victim sub-block using valid page information of each sub-block and valid page information of memory cells adjacent to each sub-block.
摘要:
A data write method of a nonvolatile memory device is provided which includes receiving write data to be stored in selected memory cells; reading data stored in the selected memory cells; processing the write data according to a plurality of data modulation manners to generate a plurality of modulated data values; calculating the number of flip bits and the number of switching bits when the write data and the plurality of modulated data values are overwritten on the selected memory cells, each flip bit indicating that a logical value of a selected memory cell is reversed and each switching bit indicating that a logical value of a selected memory cell is switched from a first logical value to a second logical value; and selecting one of the write data and the plurality of modulated data values according to calculating the number of flip bits and the number of switching bits.
摘要:
Disclosed is a memory system which includes a nonvolatile memory device including a memory cell array having a plurality of word lines including a first set of word lines storing first data having a high bit error rate, and a second set of word lines storing second data having low bit error rate less than the high bit error rate, and a memory controller that during a program operation maps logical addresses for a portion of the first data and a portion of the second data onto a selected word line selected from the plurality of word lines.