Abstract:
A memory system is provided. The memory system includes at least one memory device, and a controller configured to control the at least one memory device, wherein the controller includes: an error correction circuit configured to correct an error in data read from the at least one memory device, a codeword error counter configured to obtain a syndrome of a current codeword error based on a codeword error occurring in the error correction circuit, and to obtain a weighted codeword error count value by comparing the obtained syndrome with a previous syndrome, and an alert device configured to generate a warning signal for preventing an uncorrectable error of the at least one memory device according to the weighted codeword error count value.
Abstract:
A memory controller configured to control a memory module, the memory controller including processing circuitry configured to perform ECC decoding on a read codeword from the memory module using a first portion of a parity check matrix to generate a first syndrome and a second syndrome, determine a type of error in the read codeword based on the second syndrome and a decision syndrome, the decision syndrome corresponding to a sum of the first syndrome and the second syndrome, and output a decoding status flag indicating the type of error.
Abstract:
Provided are a memory system and an operating method thereof. The operating method reads an observation memory cell at least one time with different read voltages to configure a first read data symbol, reads a plurality of interference memory cells adjacent to the observation memory cell at least one time with different read voltages to configure second read data symbols, and determines a logical value of the observation memory cell based on the first read data symbol and the second read data symbols.
Abstract:
A random data reading method of a nonvolatile memory device includes receiving an initial seed corresponding to a selected page of the nonvolatile memory device and relative location information of read-requested random data in the selected page. The method further includes generating a seed for randomizing the random data by subjecting the initial seed and the location information to a finite field arithmetic operation, and de-randomizing the random data based on a random sequence generated from the seed.
Abstract:
An operating method of a controller includes selecting bits of code word to be punctured; detecting locations of incapable bits of an input word based on locations of the bits to be punctured and a structure of a generation matrix calculation unit; refreezing the input word such that frozen bits and incapable bits of the input word overlap; generating input word bits by replacing information word bits with frozen bits based on the refreezing result; generating the code word by performing generation matrix calculation on the input word bits; generating output bits by puncturing the code word based on locations of the bits to be punctured; and transmitting the output bits to a nonvolatile memory device.
Abstract:
An operating method of a nonvolatile memory device controller includes generating a code word through polar encoding of information bits, reading a mapping pattern, generating a repeated mapping pattern through iteration of the mapping pattern, and mapping each bit of the code word onto a specific bit of multi-bit data of the nonvolatile memory device, based upon the repeated mapping pattern.