Method for accessing flash memory module and associated flash memory controller and electronic device

An electronic device, comprising:

• a flash memory module;
• and
• a flash memory controller configured to access the flash memory module, wherein the flash memory controller comprises a decoder, the flash memory controller records multiple read retry tables, each of the multiple read retry tables records at least one reading voltage, and any two read retry tables do not have exactly the same reading voltage;
• wherein the flash memory controller classifies the multiple read retry tables into at least a first group and a second group to establish a classifying and sorting table, wherein the first group comprise the read retry table(s) that are previously used to read the flash memory module to obtain read data, and the read data can be successfully decoded by the decoder;
• and the second group comprises the read retry table(s) that that are previously used to read the flash memory module to obtain read data, and the read data is failed to be successfully decoded by the decoder, and a syndrome or a syndrome weight generated during a decoding process of the decoder meets a first condition;
• wherein the flash memory controller selects a first read retry table from the first group to read a page of a block of the flash memory module to generate first read data, and when the decoder fails to decode the first read data, the flash memory controller selects a second read retry table from the first group to read the page of the block of the flash memory module to generate second read data, for the decoder to decode.

A method for accessing a flash memory module, comprising:

• classifying multiple read retry tables into at least a first group and a second group to establish a classifying and sorting table, wherein each of the multiple read retry tables records at least one reading voltage, and any two read retry tables do not have exactly the same reading voltage;
• the first group comprise the read retry table(s) that are previously used to read the flash memory module to obtain read data, and the read data can be successfully decoded by a decoder;
• and the second group comprises the read retry table(s) that that are previously used to read the flash memory module to obtain read data, and the read data is failed to be successfully decoded by the decoder, and a syndrome or a syndrome weight generated during a decoding process of the decoder meets a first condition;
• selecting a first read retry table from the first group to read a page of a block of the flash memory module to generate first read data;
• and
• when the decoder fails to decode the first read data, selecting a second read retry table from the first group to read the page of the block of the flash memory module to generate second read data, for the decoder to decode.