METHOD AND CIRCUIT FOR QC-LDPC CODES IN NAND FLASH MEMORY

摘要

The present invention relates to a method and a circuit for creating a quasi-cyclic low-density parity-check (QC-LDPC) code in a NAND flash memory. The method for creating a QC-LDPC code in a NAND flash memory comprises: a step of initializing internal information and external information in response to a range of a parity-check matrix depending on a redundancy extension step; a step of refreshing the external information; a step of determining each bit of a code word; and a step of determining whether to extending a decoding step depending on a parity-check result of a code word, thereby the present invention can raise an error correction rate by increasing a size of redundancy, and extend a lifetime of a NAND flash memory by raising the error correction rate.