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

A flash memory controller, wherein the flash memory controller is used to access a flash memory module, the flash memory module comprises a plurality of dies, each die comprises a plurality of blocks, each block comprises a plurality of pages, and the flash memory controller comprises:

• a read-only memory, configured to store a program code;
• a microprocessor, configured to execute the program code to control access of the flash memory module;
• an encoder;
• and
• a buffer;
• wherein the microprocessor configures the flash memory module to have a super block, wherein the super block comprises a plurality of blocks respectively located in the plurality of dies;
• the encoder encodes M data respectively to sequentially generate M temporary parities, wherein M is a positive integer greater than two, and each of the M data is used to be written into a page of each of the plurality of blocks;
• the encoder stores the M temporary parities into N areas of a buffer sequentially, wherein N is less than M, each of the N areas is only allowed to store one temporary parity, and a first part of the N areas is always used to store a portion temporary parities of the M temporary parities and their subsequent updated temporary parities, but other temporary parities of the M temporary parities or their subsequent updated temporary parities are not stored in the first part of the N areas;
• and the encoder generates M parities according to the M temporary parities, respectively, and writing the M parities into the super block.

A memory device, comprising:

• a flash memory module comprising a plurality of dies, wherein each die comprises a plurality of blocks, and each block comprises a plurality of pages;
• a flash memory controller, configured to access the flash memory module;
• wherein the flash memory controller is configured to perform the steps of:
• configuring the flash memory module to have a super block, wherein the super block comprises a plurality of blocks respectively located in the plurality of dies;
• encoding M data respectively to sequentially generate M temporary parities, wherein M is a positive integer greater than two, and each of the M data is used to be written into a page of each of the plurality of blocks;
• storing the M temporary parities into N areas of a buffer sequentially, wherein N is less than M, each of the N areas is only allowed to store one temporary parity, and a first part of the N areas is always used to store a portion temporary parities of the M temporary parities and their subsequent updated temporary parities, but other temporary parities of the M temporary parities or their subsequent updated temporary parities are not stored in the first part of the N areas;
• and
• generating M parities according to the M temporary parities, respectively, and writing the M parities into the super block.