Operating method of error correction code decoder and memory controller including the error correction code decoder

摘要

An operating method of an ECC decoder includes receiving first chunk data and second chunk data from a nonvolatile memory device, the second chunk data subsequent to the first chunk data, performing error correction on the first chunk data, determining if the first chunk data includes an uncorrectable error bit and determining not to perform error correction on the second chunk data in response to the first chunk data including the uncorrectable error bit.

主权项

1. An operating method of an error correction code (ECC) decoder which uses a low density parity check (LDPC) code, the operating method comprising:
reading first chunk data of hard-decision data and second chunk data of the hard-decision data from a nonvolatile memory device using a read voltage, the second chunk data received subsequent to the first chunk data; performing error correction on the first chunk data; determining if the first chunk data includes an uncorrectable error bit; determining not to perform error correction on the second chunk data if the first chunk data is determined to include the uncorrectable error bit; obtaining third chunk data of soft-decision data and fourth chunk data of the soft-decision data in response to the hard-decision data including the uncorrectable error bit, the fourth chunk data obtained subsequent to the third chunk data; determining if the third chunk data includes the uncorrectable error bit; determining not to perform error correction on the fourth chunk data if the third chunk data is determined to include the uncorrectable error bit; adjusting the read voltage; reading fifth chunk data of the hard-decision data and sixth chunk data of the hard-decision data from the nonvolatile memory device using the adjusted read voltage, the fifth chunk data of the hard-decision data corresponding to the first chunk data of the hard-decision data and the sixth chunk data of the hard-decision data corresponding to the second chunk data of the hard-decision data; performing error correction on the fifth chunk data; determining if the fifth chunk data includes the uncorrectable error bit; and determining not to perform error correction on the sixth chunk data if the fifth chunk data is determined to include the uncorrectable error bit.