MEMORY SYSTEM CAPABLE OF STORING MULTI-BIT DATA AND ITS READ METHOD

摘要

A memory system having memory cells capable of storing multi bit data and a reading method thereof are provided to secure a reading margin by correcting data according to a program state of a memory cell. A non volatile memory device(1100) has memory cells for storing multi bit data. A memory controller(1200) controls the non volatile memory device. The memory controller is based on data read from memory cells adjacent to a selected memory cell in a reading operation, and determines whether or not a state of the data read from the selected memory cell is changed into a different state when peripheral memory cells are programmed. The memory controller corrects the data read from the selected memory cell according to a determined result.