摘要:
An operating method is for a memory device which controls a nonvolatile memory. The operating method includes managing a program depth bit map indicating an upper page program state of each of a plurality of word lines of the nonvolatile memory in response to an external write request, and outputting one of a plurality of different read commands to the nonvolatile memory based on information of the program depth bit map corresponding to a word line to be accessed in response to an external read request.
摘要:
A program method of a nonvolatile memory device according to example embodiments includes a operation (a) of detecting a level of a program voltage; and a operation (b) of providing a unselected word line voltage and a bit line precharge voltage having a variable level respectively according to the detected level of the program voltage.
摘要:
A nonvolatile memory device includes a first address decoder and a second address decoder. The first address decoder includes a plurality of transistors disposed in a first well, and the second address decoder includes a plurality of transistors disposed in a second well that is electrically isolated from the first well. The first and second address decoders are associated with first and second memory blocks, respectively. A switch circuit is configured to provide a negative voltage to one of the first address decoder and the second address decoder on the basis of block address information that specifies an address included in one of the first memory block and the second memory block. Related methods of operation are also discussed.
摘要:
A nonvolatile memory device includes a first address decoder and a second address decoder. The first address decoder includes a plurality of transistors disposed in a first well, and the second address decoder includes a plurality of transistors disposed in a second well that is electrically isolated from the first well. The first and second address decoders are associated with first and second memory blocks, respectively. A switch circuit is configured to provide a negative voltage to one of the first address decoder and the second address decoder on the basis of block address information that specifies an address included in one of the first memory block and the second memory block. Related methods of operation are also discussed.
摘要:
A nonvolatile memory device (NVM), memory system and apparatus include control logic configured to perform a method of applying negative voltage on a selected wordline of the NVM. During a first time a first high voltage level is applied to the channel of a transistor of a address decoder and a ground voltage is applied to the well of the transistor. And, during a second time a second high voltage level is applied to the channel of the transistor, and within the second time interval a first negative voltage is applied to the well of the transistor. The first high voltage level is higher than the second high voltage level, and a voltage applied on the selected wordline is negative within the second time interval.
摘要:
A negative voltage generator includes a direct current voltage generator configured to generate a direct current voltage, a reference voltage generator configured to generate a reference voltage, an oscillator configured to generate an oscillation clock, a charge pump configured to generate a negative voltage in response to a pump clock, and a voltage detector. The voltage detector is configured to detect the negative voltage by comparing a division voltage, obtained by voltage dividing the direct current voltage, with the reference voltage, and to generate the pump clock corresponding to the detected negative voltage based on the oscillation clock.
摘要:
Nonvolatile memory devices include a two-dimensional array of nonvolatile memory cells having a plurality of memory cells of unequal size therein. These memory cells may include those that have unequal channel widths associated with respective word lines and those having unequal channel lengths associated with respective bit lines that are connected to corresponding strings of nonvolatile memory cells (e.g., NAND-type strings). Control circuitry is also provided that is electrically coupled to the two-dimensional array of nonvolatile memory cells. This control circuitry may operate to concurrently program first and second nonvolatile memory cells having unequal sizes from an erased state (e.g., logic 1) to an equivalent programmed state (e.g., logic 0). This is done by establishing unequal first and second word line-to-channel region voltages in the first and second nonvolatile memory cells, respectively, during an operation to program a row of memory cells in the two-dimensional array of nonvolatile memory cells, which includes the first and second nonvolatile memory cells of unequal size.
摘要:
A word line voltage generating method of a flash memory which includes generating a program voltage using a positive voltage generator; generating a plurality of negative program verification voltages corresponding to a plurality of negative data states using a negative voltage generator; and generating at least one or more program verification voltages corresponding to at least one or more states using the positive voltage generator. Generating a plurality of negative program verification voltages includes generating a first negative verification voltage; discharging an output of the negative voltage generator to become higher than the first negative verification voltage; and performing a negative charge pumping operation until an output of the negative voltage generator reaches a second negative verification voltage level.
摘要:
A nonvolatile memory device (NVM), memory system and apparatus include control logic configured to perform a method of applying negative voltage on a selected wordline of the NVM. During a first time a first high voltage level is applied to the channel of a transistor of a address decoder and a ground voltage is applied to the well of the transistor. And, during a second time a second high voltage level is applied to the channel of the transistor, and within the second time interval a first negative voltage is applied to the well of the transistor. The first high voltage level is higher than the second high voltage level, and a voltage applied on the selected wordline is negative within the second time interval.
摘要:
In one embodiment, an erase method for a memory including a memory array having at least first and second programmable transistors connected in series, includes restricting flow of electrons from the first programmable transistor into the second programmable transistor during an erase operation.