Nonvolatile memory device, controller and operating method thereof

The invention provides a nonvolatile memory device, a controller and an operating method thereof. The controller includes: a non-volatile memory interface circuit connected to at least one non-volatile memory device and configured to control the at least one non-volatile memory device; and an error correction circuit configured to perform an error correction operation on a codeword received from the non-volatile memory interface circuit according to an error correction decoding level selected from among a plurality of error correction decoding levels, where the non-volatile memory interface circuit is further configured to receive auxiliary information from the at least one non-volatile memory device, a distribution of the memory cells is predicted based on the auxiliary information, and an error correction decoding level is selected from among the plurality of error correction decoding levels according to the predicted distribution. 提供了非易失性存储器装置、控制器及其操作方法。所述控制器包括：非易失性存储器接口电路，连接到至少一个非易失性存储器装置，并且被配置为控制所述至少一个非易