Error correction decoder and operating method of error correction decoder

The present invention relates to a method of operating an error correction decoder that corrects an error of the read from the non-volatile memory data. Method of operation of the present invention, a first error in performing a method comprising: receiving data from the non-volatile memory, a first error correction of the data received from when an error exists in the received data, a simplified mode, and a simplified mode If the correction fails, it consists of performing a second error correction of the data received in the full mode. When the first error correction in a simplified mode, a portion of the operations performed by the second error correction of the full mode are omitted.