摘要:
A nonvolatile memory device includes a page region including a plurality of normal cells and a plurality of auxiliary cells, a detecting unit configured to output a pass signal when at least one cell is programmed with a voltage higher than a reference voltage among program target cells of the page region, a count storing unit configured to store a count in the plurality of auxiliary cells during a first program operation for the page region, wherein the count indicates a total number of program pulses applied to the at least one cell until the pass signal is outputted from the detecting unit, and a voltage setting unit configured to set a program start voltage for a second program operation of the page region based on the count stored in the plurality of auxiliary cells.
摘要:
A data programming method includes the steps of determining whether a threshold voltage distribution of a memory cell, where a first bit value of writing data was programmed, has deviated from a targeted first voltage range, correcting the first bit value through an error correction code if the threshold voltage distribution of the memory cell has deviated from the first voltage range, and programming a corrected first bit value and a second bit value of the writing data to the memory cell.
摘要:
A nonvolatile memory device comprises a page buffer unit, a counter, a program pulse application number storage unit, and a program start voltage setting unit. The page buffer is configured to output a 1-bit pass signal when a cell programmed to exceed a reference voltage, from among target program cells included in a single page, exists. The counter is configured to count a number of program pulses applied to determine a program pulse application number. The program pulse application number storage unit is configured to store a number of program pulses applied until the 1-bit pass signal is received during a program operation for a first page. The program start voltage setting unit is configured to set a program start voltage for a second page based on the stored program pulse application number.
摘要:
A page buffer of a flash memory device is configured to program two pages in a single programming operation. The page buffer of the flash memory device includes a first bit line selection unit, a second bit line selection unit, a separation unit, a precharge unit, a first register, and a second register.
摘要:
A memory device includes a main memory cell having a plurality of first memory cells for storing data, wherein a special block for storing a column address corresponding to a first memory cell having at least one failure is disposed in a part of area of the main memory cell; a start address block configured to store address information initiated by the special block of the main memory cell; and a repair information block configured to provisionally store the column address stored in the special block, and to output a repair controlling signal when operating the memory device.
摘要:
An operation method of a nonvolatile memory device includes reading information of an erase target block, and performing an erase operation by using a starting erase bias corresponding to the information.
摘要:
In an operating method in a read or verification operation of a nonvolatile memory device, selected bit lines are precharged to a logic high level and, at the same time, unselected bit lines are discharged to a logic low level. The selected and unselected bit lines are connected to respective memory cell strings and, concurrently, word lines are supplied with a pass voltage. The connection between the selected and unselected bit lines and the respective memory cell strings is shut off and, concurrently, a selected word line is supplied with a ground voltage. The selected and unselected bit lines and the respective memory cell strings are coupled together and, concurrently, a selected word line is supplied with a reference voltage and an unselected word line is supplied with the pass voltage.
摘要:
A method of operating a nonvolatile memory device, including a memory cell array, which further includes a drain select transistor, a memory cell string, and a source select transistor coupled between a bit line and a source line, where the method includes precharging the bit line, setting the memory cell string in a ground voltage state, coupling the memory cell string and the bit line together and supplying a read voltage or a verification voltage to a selected memory cell of the memory cell string, and coupling the memory cell string and the source line together in order to change a voltage level of the bit line in response to a threshold voltage of the selected memory cell.
摘要:
A method of verifying a program operation in a non-volatile memory device includes performing a program operation, verifying whether or not each of a plurality of program target memory cells is programmed to a voltage higher than a verifying voltage, counting a number of fail status bits in response to determining that a fail status memory cell is not programmed with a voltage higher than the verifying voltage based on the verified result, and setting data so that a plurality of page buffers each output a pass signal when the number of the fail status bits is smaller than a number of error correction code (ECC) processing bits.
摘要:
A method of operating a nonvolatile memory device includes performing a program operation on memory cells included in a selected page, checking whether a verification operation for the programmed memory cells is passed or failed by performing the verification operation, counting a number of error bits for the selected page, if the verification operation is failed, performing an error checking and correction (ECC) algorithm using an error correction circuit, if the counted number of error bits is less than or equal to a number of correctable bits, and storing the counted number of error bits in a specific one of a plurality of memory blocks.