Patent ID: 9165665
Filing Date: 2015-10-20
Classification: G11C

Abstract:
1. A memory system comprising: a non-volatile memory device which stores data; a monitoring unit which monitors a characteristic of the non-volatile memory device when a writing process is performed to write the data to the non-volatile memory device, the writing process being a process in which a writing operation and a verification operation are alternately repeated while starting a writing voltage from a writing start voltage and sequentially increasing a writing voltage by a writing incremental voltage in the writing operation; and a changing unit which changes at least one of a value of the writing start voltage and an amount of the incremental voltage in the writing process based on the monitored characteristic so that a time for the writing process can be maintained at a target value, wherein the monitored characteristic of the non-volatile memory device includes at least one of a frequency of the writing process, a frequency of an erasing process, a time for the writing process, a time for the erasing process, a repeat count of the writing operation and the verification operation in the writing process, and a repeat count of an erasing operation and a verification operation in the erasing process.