摘要:
Erase and program methods of a flash memory device including MLCs for increasing the program speed are described. In the erase method, MLCs are pre-programmed so that a voltage range in which threshold voltages of MLCs are distributed can be reduced. Therefore, a fail occurrence ratio can be reduced when erasing MLCs, the threshold voltage distribution of MLCs can be improved and an overall program time can be shortened in a subsequent program operation.
摘要:
Erase and program methods of a flash memory device including MLCs for increasing the program speed are described. In the erase method, MLCs are pre-programmed so that a voltage range in which threshold voltages of MLCs are distributed can be reduced. Therefore, a fail occurrence ratio can be reduced when erasing MLCs, the threshold voltage distribution of MLCs can be improved and an overall program time can be shortened in a subsequent program operation.
摘要:
Erase and program methods of a flash memory device including MLCs for increasing the program speed are described. In the erase method, MLCs are pre-programmed so that a voltage range in which threshold voltages of MLCs are distributed can be reduced. Therefore, a fail occurrence ratio can be reduced when erasing MLCs, the threshold voltage distribution of MLCs can be improved and an overall program time can be shortened in a subsequent program operation.
摘要:
A method of erasing and programming a flash memory device including multi-level cells (MLCs). MLCs of a word line are selected and some of the MLCs are pre-programmed based on whether their individual threshold voltages are included in a first voltage range. The selected MLCs are pre-programmed with a pre-program (first) voltage; and the remaining MLCs are prohibited from pre-programming; then the remaining MLCs connected to the selected word line are programmed by applying a program (second) voltage that gradually rises from the pre-program voltage at a ratio of a step voltage n for the selected line.
摘要:
Erase and program methods of a flash memory device including MLCs for increasing the program speed. In the erase method, MLCs are pre-programmed so that a voltage range in which threshold voltages of MLCs are distributed can be reduced. Therefore, a fail occurrence ratio can be reduced when erasing MLCs, the threshold voltage distribution of MLCs can be improved and an overall program time can be shortened in a subsequent program operation.
摘要:
According to a method of controlling the operation of a flash memory device including a number of memory blocks, a memory block of the memory blocks is first selected as a reference block. A program operation is performed on a memory cell included in the reference block. In order to check an operating characteristic of the reference block, a threshold voltage level of the programmed memory cell is read. Parameters for performing an operation of the flash memory device are determined based on the operating characteristic of the reference block. The parameters are stored in the reference block.
摘要:
A read method of a memory device including a MLC includes the steps of performing a data read operation according to a first read command; determining whether error correction of the read data is possible; if, as a result of the determination, error correction is difficult, performing a data read operation according to a second read command; determining whether error correction of read data is possible according to the second read command; and if, as a result of the determination, error correction is difficult, performing a data read operation according to a Nth (N≧3, N is an integer) read command.
摘要:
The present invention relates to a flash memory device. The present invention relates to a flash memory device in which a capacitor of a given capacitance is connected between a bit line connected to a drain region and a ground line within a flash cell array, and method of erasing the same. Therefore, the present invention can reduce the time and power consumption in the cell erase operation, by accelerating an increase of hot carriers generated in a diode reverse-bias state between the drain region and a semiconductor substrate upon an erase operation of the cell to prevent over-erase or non-erase of the cell by means of hot carriers and by thus solving an over-erase problem of the cell without requiring additional pre-programming and verification operation and additional post-programming and verification operation.
摘要:
A program method of a semiconductor memory device includes performing a least significant bit (LSB) program operation for target LSB program cells of a selected page, increasing the threshold voltages of target most significant bit (MSB) program cells of the selected page before performing an MSB operation for the target MSB program cells, and performing the MSB program operation for the target MSB program cells after the increasing of the threshold voltages of the target MSB program cells.
摘要:
A method of operating a nonvolatile memory device comprises performing a read operation to read data stored in a first memory cell block including first unit groups; detecting a second unit group from among the first unit groups, the second unit group having a number of error bits included in the read data, which is greater than a set number of bits and equal to or smaller than a maximum allowable number of bits which can be corrected through an error checking and correction (ECC) processing; and after the second unit group is detected, performing a copyback operation for moving the data, that are stored in the first memory cell block, to a second memory cell block.