Abstract:
PURPOSE: A flash memory device and a program method thereof are provided to improve program speed by removing a program verification operation of a small memory cell which has a little threshold voltage change. CONSTITUTION: In a flash memory device and a program method thereof, a program of 1 -th bit of a 4- bit MLC is performed. The program of an upper 3 bit excluding a least significant bit(LSB) is performed through a plurality of program steps. Each program step is composed of a plurality of program loops. The level of change of a threshold voltage is highest at sT7 and lowest at ST4. A program verification operation of ST5 and ST6 program is removed. The program verification operation of ST7 program is performed. The program verification operation of ST4 program is performed.
Abstract:
PURPOSE: A nonvolatile memory device, a memory management system having the same, and a wear leveling method thereof are provided to improve the performance and lifespan of a non-volatile memory device by managing wear quality according to the number of erasures and degree of wear. CONSTITUTION: In a nonvolatile memory device, a memory management system having the same, and a wear leveling method thereof, a memory controller comprises a threshold voltage measure controller(120 1). The threshold voltage measure controller measures the threshold voltage of a charge loss measurement cell. The threshold voltage measure controller calculates the degree of change of the threshold voltage. The threshold voltage measure controller calculates a valid erasure frequency. The memory cell array comprises a valid erasure frequency table(120 2). The valid erasure frequency table comprises an erasure frequency table. The erasure frequency table stores the erasure frequencies of a plurality of memory blocks.
Abstract:
PURPOSE: A non-volatile memory device and a program method thereof are provided to reduce power consumption in programming by making threshold voltage distribution narrow. CONSTITUTION: In a non-volatile memory device and a program method thereof, a page buffer(130) is connected to the bit line of a memory cell. A control logic(140) controls the page buffer. The pre charge of the bit line is deactivated in a program verification operation before a specific loop count. The precharge of the bit line is activated in the program verification operation at a specific loop count and after then. A loop count value is stored in the page buffer.
Abstract:
PURPOSE: A non-volatile memory device and a programming method thereof are provided to increase the lifecycle of the non-volatile memory device by uniformly distributing a deletion or program period for the memory block over the overall area of the non-volatile memory. CONSTITUTION: A memory cell array(110) comprises memory cells arranged in a plurality of rows and columns. A write and read circuit(130) operates as a detection amplifier or a write driver according to an operation mode. The deletion/program period data read from the write and read circuit is offered as control logic.
Abstract:
PURPOSE: A memory device and a method for driving the same are provided to prevent the disturbance of a program by boosting a cell which is prohibited to be programmed with high power. CONSTITUTION: A semiconductor system(200) includes a memory device and a processor(220). The processor controls the writing operation, the reading operation or the verifying-reading operation of the semiconductor device. A timing controller performs the verifying-reading operation or a program operation in response with control signal from the processor. A battery(250) supplies operational power to the memory device and the processor. An input-output device provides interface with an external data process device for transmitting and receiving data.
Abstract:
PURPOSE: A nonvolatile memory device and a memory system thereof are provided to supply a post program for improving a pass voltage window by controlling a develop time when a precharge voltage is discharged. CONSTITUTION: In a nonvolatile memory device and a memory system thereof, a memory cell array(110) is composed of a plurality of memory blocks. A decoder(130) is connected to a plurality of memory blocks through a word line. A page buffer circuit(120) is connected to a plurality of memory blocks through the bit line. The control logic controls a voltage supplied to the word line and the bit line according to the location of a memory block. A control logic(150) controls the develop time when a precharge voltage applied to the bit line is discharged.
Abstract:
PURPOSE: A flash memory device is provided to reduce manufacturing costs and improve the integration rate of a memory device by using a dummy transistor in order to select a memory cell string which is structured to a common bit line. CONSTITUTION: A first memory cell string is connected to a bit line(BL) through a first and a second dummy transistor. A second memory cell string is connected to the bit line through a third and fourth dummy transistor. The first and the third dummy transistor are connected to a first dummy word line(DWL1). The second and the fourth dummy transistor are connected to a second dummy word line(DWL2). The threshold voltage of the first and the third dummy transistor is set to be different from each other. The threshold voltage of the second and the fourth dummy transistor is set to be different from each other.
Abstract:
PURPOSE: A memory apparatus protecting a read disturbance and a method thereof are provided to prevent a bit error generating from the reading disturbance by applying a preset voltage to a common source line in a control logic. CONSTITUTION: A first cell string is connected between a first bit line and a first common source line. A second cell string is connected between a second bit line which is adjacent to the first bit line and a second common source line. A control logic(117) independently controls the first and second common source lines. The control logic applies a preset voltage to the second common source line. The first cell string comprises a cell string of even number. A second cell string comprises a cell string of odd number.
Abstract:
PURPOSE: A non-volatile memory device for extracting parameters and a nonvolatile memory system including the same are provided to set properly optimized parameters by measuring a reference parameter for each plane, block and page. CONSTITUTION: A memory cell array(111) comprises a plurality of memory blocks. A control logic stores a parameter for accessing each memory block. A control logic(117) detects the change of a parameter while accessing each memory block. The control logic stores the changed parameter to a memory cell array according to the detection result. The control logic accesses at least one memory block among a plurality of memory blocks. The control logic uses the parameter saved in the memory cell array.
Abstract:
PURPOSE: A multi-layered memory device and an operation method thereof are provided to improve operation performance of the memory device, by enabling at least one memory cell array to perform read/write operation at the same time. CONSTITUTION: A first semiconductor substrate(10) has a memory cell array comprising a number of memory cells. A second semiconductor substrate(20) is stacked on the first semiconductor substrate, and has a bit line and a page buffer connected to the bit line in correspondence to the memory cell array. A bit line contact is formed between the first semiconductor substrate and the second semiconductor substrate. The bit line contact connects the page buffer and memory cell array.