44 results about "Program proving" patented technology

An authentication utility may be provided to entities, such as businesses, organizations or even individuals, that require the identification, verification and control of the identity of another entity, for example, an individual, such as a consumer, employee, etc. The authentication utility may also determine and provide the financial and non-financial characteristics of an individual. Before entering into a relationship or transaction, an entity could verify the other party's identity with the authentication utility.

A NAND flash memory device according to some embodiments includes a cell array, a page buffer configured to copyback read the data in the cell array, and an error detector for detecting errors that occur during the copyback reading and for generating a detection signal. Detecting errors is performed concurrently with a copyback program operation and completes before finishing a copyback program verify operation. The data stored in the page buffer may be copyback programmed when the detection signal is a pass signal. The copyback operation may end without executing the copyback program operation when the detection signal is a fail signal. Since the copyback program operation and the error detection operation are performed concurrently, the errors occurring during the copyback operation may be detected without additional time delay. Additionally, occurrence of two-bit error may be prevented because the copyback program is not executed when the fail signal is generated.

In programming a selected word line of memory cells, a first program verify or read operation is performed, after one page of a selected word line is programmed, in order to determine a first quantity of memory cells that have been programmed to a predetermined reference point in the programmed first page distribution. Prior to programming the second page of the selected word line, a second program verify or read operation is performed to determine a second quantity of cells that are still at the reference point. The difference between the first and second quantities is an indication of the quantity of cells that experienced quick charge loss. The difference is used to determine an adjustment voltage for the second page verification operation after programming of the second page.

Methods for mitigating runaway programming in a memory device, methods for program verifying a memory device, a memory device, and a memory system are provided. In one such method, a ramp voltage signal is generated by a digital count signal. A memory cell being program verified is turned on by a particular verify voltage of the ramp voltage signal in response to a digital count of the digital count signal. The memory cell turning on generates a bit line indication that causes the digital count to be compared to a representation of the target data to be programmed in the memory cell. The comparator circuit generates an indication when the digital count is greater than or equal to the target data.

The disclosed is a page buffer of a flash memory device. In accordance with the present invention, a latch is controlled through a program verification signal, a latch signal, and latch data in a page buffer during a program verification. As a result, there are many advantages. First, in the event that the program verification is performed after programming once more, a passed cell is not sensed again and maintains its value. Second, it is possible to prevent a problem caused by a sensing operation as well as a verification error due to an external factor. As a result, program operation errors can be prevented.

A method for executing a program verify operation in a non-volatile memory. A data register having master and slave latching circuits is used for concurrently storing two different words of data. In a program operation, the master latch stores program data which is used for programming selected memory cells. In a program verify operation, the data programmed to the memory cells are read out and stored in the slave latches. In each data register stage, the logic states of both latches are compared to each other, and a status signal corresponding to a program pass condition is generated if opposite logic states are stored in both latches. The master latch in each stage is inverted if programming was successful, in order to prevent re-programming of that bit of data.

A storage area managing system using a system for virtually executing a program code before really executing the program code, the storage area managing system, that comprises virtual executing means for verifying only a data type restriction of the program code before really executing the program code, data valid range deciding means for deciding the final use position of each data and storing it during the process of said virtual executing means, and storage area unallocating means for unallocating a storage area for data that exceeds the data valid range corresponding to the data validity range information designated by said data valid range deciding means during the real execution of the program code.

A method of programming a nonvolatile memory device includes inputting program data to page buffers; performing a program operation and a program verification operation until threshold voltages of memory cells included in a selected page reach a target level according to the program data; when the threshold voltages of the memory cells reach the target level, performing an over-program verification operation to determine over-programmed memory cells in the memory cells; and making a determination of whether error checking and correction (ECC) processing for the over-programmed memory cells is feasible.

Disclosed is a flash memory device and a program verification method thereof which can prevent a misjudgment as to whether flash memory cells are programmed or not. The flash memory device includes: a program verification voltage generator for variably generating program verification voltages used to verify whether the flash memory cells are programmed or not and a word line level selector for transferring the program verification voltages to word lines connected to control gates of the flash memory cells. The flash memory cells that are verified as uncertain as to whether the flash memory cells are programmed or not can be completely programmed since the program verification operation is carried out with program verification voltage levels that are changed according to the selective activations of the program verification control signals.

A method for programming a nonvolatile memory array including an array of memory cells, each memory cell including a substrate, a control gate, a charge storage element, a source region and a drain region, includes performing a program operation on a group of memory cells, where the group of memory cells includes a plurality of subgroups. A verify status value is stored for each subgroup, the verify status value indicating a verify status of each subgroup, wherein the verify status value indicates whether an associated subgroup has been program verified. A program verify operation is performed on a selected subgroup when the verify status value associated with the selected subgroup indicates that the selected verify subgroup has not been program verified.

Disclosed are a page buffer of a flash memory device and data program method using the same. After two data are sequentially stored in a main register (first latch) and a cache register (second latch) provided in a page buffer, they are respectively transferred to an even bit line and an odd bit line at the same time, and a bias needed for a program is applied to cells connected to the even bit line and the odd bit line, respectively, whereby the program is performed at the same time. Therefore, the number and time of operations for data loading, program operation and program verification can be reduced by half and the operating speed of the device can be improved.

A NOR flash memory device and related programming method are disclosed. The programming method includes programming data in a memory cell and, during a program verification operation, controlling the supply of current from a sense amplifier to the memory cell in relation to the value of the programmed data. Wherein a program verification operation is indicated, current is provided from the sense amplifier to the memory cell. Where a program verification operation is not indicated, current is cut off from the sense amplifier.

A PRAM and programming method are disclosed. The PRAM includes a memory cell array including a test cell, a write driver applying a program pulse and providing a program current to the memory cell array, a sense amplification and verification circuit reading data programmed in the memory cell array and performing a program verify operation on the data, and a program loop control unit storing program verification result for the test cell at each program loop during test operation and generating the program pulse according to the program verification result to control the start of the program loop during normal operation.

Methods for mitigating runaway programming in a memory device, methods for program verifying a memory device, a memory device, and a memory system are provided. In one such method, a ramp voltage signal is generated by a digital count signal. A memory cell being program verified is turned on by a particular verify voltage of the ramp voltage signal in response to a digital count of the digital count signal. The memory cell turning on generates a bit line indication that causes the digital count to be compared to a representation of the target data to be programmed in the memory cell. The comparator circuit generates an indication when the digital count is greater than or equal to the target data.

An improved method for automatically improving the precision of an extrapolation operator used, for example, in software program verification in connection with the static analysis and model checking of the software programs which rely on fix-point computation. In particular, a new extrapolation-with-care-set operator, together with a method for gradually increasing the precision of this operation by tightening the care set.

A page buffer circuit includes a bit line selection circuit, a main register, a program transmission circuit, a temporary register, and a verification transmission circuit. The verification transmission circuit transmits data stored in the temporary register to the main register through a sensing node in response to a transmission control signal during a program verification operation. A memory cell that has been determined to be programmed in a previous program verification process is verified again in a next program verification process.

A program verification apparatus includes: a program executing unit executing a program; a variable monitoring unit monitoring a plurality of variables in the program to obtain monitor values of the variables; a target variable determiner determining one or more target variables out of the variables; a constraint condition storage storing a first constraint condition that defines a constraint to be satisfied for each of the target variables and a second constraint condition that defines a constraint to be satisfied among the target variables; a state acquiring unit sequentially acquiring target program state each of which is a combination of monitor values of the target variables at same time respectively; a state generating unit generating an unreached target program state which has not been acquired yet and satisfies the first and second constraint conditions; and a state setting unit setting the unreached target program state to the program.

A selected memory cell on a selected word line is programmed through a plurality of programming pulses that are incremented by a step voltage. After a successful program verify operation, programming of the selected memory cell is inhibited while other memory cells of the selected word line are being programmed. Another program verify operation is performed on the selected memory cell. If the program verify operation fails, a bit line coupled to the selected cell is biased at the step voltage and a final programming pulse is issued to the selected word line. The selected memory cell is then locked from further programming without evaluating the final program verify operation.

A method for verifying a branch prediction mechanism and an accessible recording medium for storing a verification program are provided. The method is used for verifying the branch prediction mechanism, such as a branch target buffer (BTB), in a processor. The method comprises providing and executing a verification program in the processor. The verification program comprises at least one branch instruction, which determines whether to use a recursive call and execute the verification program according to a given condition.

Methods for programming and program verification of a flash memory are described that ease the buried drain contact induced operation and increase the retention window. In a first aspect of the invention, a program operation method provides varying program biases which are applied to different groups of memory cells. The program biases can be supplied as drain bias voltages or gate bias voltages. The program biases vary depending on which group of memory cells is programmed. In one embodiment, a first drain voltage VD1 is applied to the first group of memory cells M0 and Mn. A second drain voltage VD2 is applied to the second group of memory cells M1 and Mn-1, where VD2=VD1+ΔVD. In a second aspect of the invention, a plurality of program verification voltage levels are selected to verify that the memory cells pass the program voltage levels.

A page buffer circuit includes a bit line selection circuit, a main register, a program transmission circuit, a temporary register, and a verification transmission circuit. The verification transmission circuit transmits data stored in the temporary register to the main register through a sensing node in response to a transmission control signal during a program verification operation. A memory cell that has been determined to be programmed in a previous program verification process is verified again in a next program verification process.

A necessary information extraction unit extracts, from variables used in a target program, an output variable to which output information to be output by an output function defined in an output function list is set. The necessary information extraction unit extracts, from the variables used in the target program, an encryption variable to which encrypted information encrypted by an encrypting function defined in an encryption function list is set. A protected state analysis unit refers to an assignment statement included in the target program, and extracts an encrypted state variable to which the encrypted information is assigned. A vulnerability determination unit determines whether or not the encrypted state variable and the output variable are the same variable, and outputs a program verification result based on a result of determination.