摘要:
In a nonvolatile memory device, a first verification result indicates whether a block of memory cells has been successfully programmed and a second verification result indicates whether a far cell in the block has been is successfully programmed. A controller defines the level and application time for the program voltage applied during a next program loop in response to the first and second verification results.
摘要:
Some embodiments of the present invention provide programming operations for reducing a program time for a nonvolatile memory device. A nonvolatile semiconductor memory device is programmed by receiving data to be programmed into memory cells from a host, programming the data into the memory cells, performing a verify read operation to determine whether the data has been successfully programmed into the memory cells, and performing a Y-scan operation while performing the verify read operation to sequentially scan and output data read from bit lines coupled to the memory cells.
摘要:
A flash memory system capable of inputting/outputting data in units of sectors at random. The flash memory system includes a flash memory (a cell array), a buffer memory, a random data input/output circuit, and a control circuit. The random data input/output circuit receives data in units of sectors from the buffer memory or outputs the data in units of sectors to the buffer memory. The control circuit controls the order and the number of times of inputting/outputting data between the buffer memory and the random data input/output circuit.
摘要:
A nonvolatile memory device comprises a memory core and a controller for controlling the wear level of a memory block in the nonvolatile memory device. The controller determines the wear level of a memory block by obtaining data of an actual wear level from a charge measurement cell of a selected region of the memory cell, and stores the wear level of the selected region in an erase count table.
摘要:
A flash memory device comprising a high voltage generator circuit that is adapted to supply a program voltage having a target voltage to a selected word line is provided. The flash memory device is adapted to terminate the program interval in accordance with when the program voltage has been restored to the target voltage after dropping below the target voltage. A method for operating the flash memory device is also provided.
摘要:
Some embodiments of the present invention provide programming operations for reducing a program time for a nonvolatile memory device. A nonvolatile semiconductor memory device is programmed by receiving data to be programmed into memory cells from a host, programming the data into the memory cells, performing a verify read operation to determine whether the data has been successfully programmed into the memory cells, and performing a Y-scan operation while performing the verify read operation to sequentially scan and output data read from bit lines coupled to the memory cells.
摘要:
A flash memory system capable of inputting/outputting data in units of sectors at random. The flash memory system includes a flash memory (a cell array), a buffer memory, a random data input/output circuit, and a control circuit. The random data input/output circuit receives data in units of sectors from the buffer memory or outputs the data in units of sectors to the buffer memory. The control circuit controls the order and the number of times of inputting/outputting data between the buffer memory and the random data input/output circuit.
摘要:
A NAND-type flash memory device including a memory cell array having a plurality of memory blocks is provided. An example NAND-type flash memory device includes a status cell array which has a plurality of status cells and stores data indicating erase/program statuses of the memory blocks, a data generation circuit which generates data indicating a program status of a selected memory block in response to a data input command and generates data indicating an erase status of a selected memory block in response to a block erase setup command, a first signal generation circuit which generates a block status write enable signal and a clock signal in response to either one of an erase command and a program command, a selection circuit which selects at least one of the status cells of the status cell array in response to a block address of the selected memory block, a write circuit which receives data from the data generation circuit in response to the clock signal during a program or erase operation and writes the received data in the selected status cell, and a control circuit which operates in response to a block status write enable signal from the first signal generation circuit and controls the write circuit so as to the store the data inputted to the write circuit in a selected status cell when an erase/program operation for the selected memory block is carried out.
摘要:
Provided is a method for reading data from a nonvolatile memory device. In the method, a read method includes a first read step including reading a first memory cell of the nonvolatile memory device by applying a first set of read voltages to the first memory cell. The read method further includes a second read step including reading the first memory cell by applying a second set of read voltages and none of the voltages in the first set to the first memory cell when it is determined that the first read step results in an error and cannot be corrected with error correction. The second read step is performed by using data resulting from the first read step.
摘要:
A method is provided for verifying a programming operation of a flash memory device. The flash memory device includes at least one memory string in which a string selection transistor, multiple memory cells and a ground selection transistor are connected in series, and the programming operation is performed with respect to a selected memory cell in the memory string. The method includes applying a voltage, obtained by adding a threshold voltage of the string selection transistor to a power supply voltage, to a string selection line connected to the string selection transistor; applying a ground voltage to wordlines connected to each of the memory cells and a ground selection line connected to the ground selection transistor; precharging a bitline connected to the memory string to the power supply voltage; and determining whether a programming operation of the selected memory cell is complete.