摘要:
The present invention relates to a method of programming a multi level cell capable of storing above 1 data bit. The method includes storing first data in a first storing unit, storing second data in a second storing unit, programming a least significant bit data in accordance with the data stored in the first and second storing units, and programming a most significant bit data in accordance with the data stored in the first and second storing units following the program of the least significant bit data.
摘要:
A method of programming a NAND flash memory device includes providing a flash memory device, wherein word lines are disposed between a drain selecting line and a source selecting line, wherein a first word line is provided adjacent to the source selecting line and a last word line is provided adjacent to the drain selecting line; and selecting a word line to program memory cells coupled to the selected word line to perform an even LSB program operation and an odd LSB program operation for the selected first word line. Each of the word lines is selected until all of the word lines have been selected, so that the even LSB program operation and the odd LSB program operation can be performed for all of the word lines. The even LSB program operation is performed to store a lower rank data bit in memory cells coupled to an even bit line assigned a selected word line. The odd LSB program operation is performed to store a lower rank data bit in memory cells coupled to an odd bit line assigned to the selected word line.
摘要:
A program operation and a program verification operation are repeatedly performed. The program verification operation is performed on memory cells including pass cells to obtain a uniform distribution characteristic of a threshold voltage. Furthermore, the program verification operation is performed with a compare voltage being set higher than a target voltage initially so that a threshold voltage of a memory cell is sufficiently higher than the target voltage. The program verification operation is again performed lowering the compare voltage according to the repetition number. Thus, normally programmed cells are prevented from being again excessively programmed.
摘要:
A multi-level cell copyback program method in a non-volatile memory device is disclosed. The method includes reading LSB data of a source page, and storing the read LSB data in a second register of a page buffer, transmitting the data stored in the second register to a first register coupled to a data inputting circuit, and storing the transmitted data in the first register, amending the data stored in the first register through the data inputting circuit, transmitting the amended data to the second register, and storing the transmitted data in the second register, and LSB-programming corresponding data to a target page in accordance with the data stored in the second register.
摘要:
The present invention relates to a method of programming a multi level cell capable of storing above 1 data bit. The method includes storing first data in a first storing unit, storing second data in a second storing unit, programming a least significant bit data in accordance with the data stored in the first and second storing units, and programming a most significant bit data in accordance with the data stored in the first and second storing units following the program of the least significant bit data.
摘要:
A repair I/O fuse circuit of a semiconductor memory device includes a reduced by as much as half layout area of fuses by replacing what one repair I/O information is represented by existing two I/O fuses with what one repair I/O information is represented by one I/O fuse. The repair I/O fuse circuit includes a plurality of I/O fuse circuits, each having one fuse. A repair signal indicates that there is an address to be replaced. If a chip enable signal is activated, each of the plurality of I/O fuse circuits outputs a repair I/O information signal depending on whether a fuse has been cut.
摘要:
A method of operating a semiconductor memory device includes performing an LSB program operation for selected memory cells while raising a program voltage, when the threshold voltages of some of the selected memory cells reach a target level, storing data, corresponding to a relevant program voltage, in a first flag cell, performing the LSB program operation for some of the selected memory cells, having threshold voltages not reached the target level, until the threshold voltages of all the selected memory cells reach the target level, and after the LSB program operation is completed, performing an MSB program operation for the selected memory cells by using a program voltage, set based on the data stored in the first flag cell, as a start program voltage.
摘要:
A read method of a nonvolatile memory device according to an exemplary embodiment of this disclosure includes precharging bit lines coupled to memory cells, performing a first read operation by supplying a first reference voltage to the memory cells in order to determine the data stored in the memory cells, precharging bit lines coupled to undetermined memory cells whose data has not been determined by the first read operation, and performing a second read operation by supplying a second reference voltage to the memory cells in order to determine data stored in the undetermined memory cells.
摘要:
Techniques and devices relating to adjusting one or more operational parameters for memory cells are provided. One such device may include a detection unit configured to perform one or more reading operations on a set of memory cells to determine an upper bound of the threshold voltages of the set of memory cells. The device may further include a parameter adjustment unit configured to adjust one or more operational parameters for the set of memory cells based, at least in part, on the determined upper bound of the threshold voltages. Other techniques and devices are also provided.
摘要:
A method of verifying a non-volatile memory device to increase the read margin even though a negative verifying voltage is not applied is disclosed. The method of verifying a non-volatile memory device includes coupling a cell string to a bit line precharged to a high level through a sensing node, the cell string being provided between a common source line and the bit line; applying a verifying voltage to a plurality of word lines associated with the cell string; disconnecting the bit line from the sensing node; coupling the common source line to the cell string while the verifying voltage is applied to the word lines, wherein the common source line is applied with a bias voltage higher than a ground voltage; and coupling the bit line to the sensing node so as to detect a level of the bit line.