| 摘要 |
PURPOSE: A memory system and a control method for the same are provided to process a decoding operation based on repeated calculation based on probability by using an LLR(Log Likelihood Ratio) table. CONSTITUTION: Semiconductor memory cells memorize N-bit encoded data based on threshold voltage distribution, and a memorizing unit(20) memorizes first and second LLR(Long Likelihood Ratio) tables(21,22). The LLR tables comprise LLR data corresponding to threshold voltage. A decoder(1) performs a decoding operation through probability-based repeated calculation by using an LLR calculated from the first and second LLR tables and the threshold voltage.
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