Method for performing block management, and associated memory device and controller thereof

A memory device, comprising:

• a Flash memory having multiple channels, wherein the Flash memory comprises a plurality of blocks respectively corresponding to the channels;
• and each of the channels corresponds to a Flash memory chip of the Flash memory;
• and
• a controller arranged to access the Flash memory and manage the plurality of blocks, wherein the controller temporarily stores at least one index of at least one good block that is not grouped into any meta block into a spare good block table, wherein the good block is a block that is not determined as a bad block within the plurality of blocks;
• wherein when it is detected that a specific block corresponding to a specific channel within blocks currently grouped into meta blocks is a bad block, the controller dynamically updates the spare good block table for use of block management;
• when it is detected that the specific block corresponding to the specific channel is a bad block and the spare good block table indicates that a good block corresponding to the specific channel exists the controller dynamically replaces the specific block with the good block corresponding to the specific channel;
• when dynamically replacing the specific block with the good block corresponding to the specific channel, the controller replaces an index, stored in the spare good block table, of the good block corresponding to the specific channel by an invalid record;
• wherein the controller stores a previous version of the spare good block table into the Flash memory, and stores a copy version of the spare good block table into a first buffer of the controller, for use of dynamically updating the spare good block table;
• the controller stores a previous version of a meta block mapping table into the Flash memory, and stores a copy version of the meta block mapping table into a second buffer of the controller;
• and the controller stores a latest version of the spare good block table within the first buffer and a latest version of the meta block mapping table within the second buffer into the Flash memory, in order to replace the previous version of the spare good block table and the previous version of the meta block mapping table;
• wherein each of blocks comprised in the meta block is corresponding to different Flash memory chip.

A controller of a memory device, the controller being utilized for accessing a Flash memory having multiple channels, each of the channels corresponds to a Flash memory chip of the Flash memory, the Flash memory comprising a plurality of blocks respectively corresponding to the channels, the controller comprising:

• a read only memory (ROM) arranged to store a program code;
• and
• a microprocessor arranged to execute the program code to control the access to the Flash memory and manage the plurality of blocks, wherein the controller that executes the program code by utilizing the microprocessor temporarily stores at least one index of at least one good block that is not grouped into any meta block into a spare good block table, and the good block is a block that is not determined as a bad block within the plurality of blocks;
• wherein when it is detected that a specific block corresponding to a specific channel within blocks currently grouped into meta blocks is a bad block, the controller that executes the program code by utilizing the microprocessor dynamically updates the spare good block table for use of block management;
• when it is detected that the specific block corresponding to the specific channel is a bad block and the spare good block table indicates that a good block corresponding to the specific channel exists, the controller that executes the program code by utilizing the microprocessor dynamically replaces the specific block with the good block corresponding to the specific channel;
• when dynamically replacing the specific block with the good block corresponding to the specific channel, the controller that executes the program code by utilizing the microprocessor replaces an index, stored in the spare good block table, of the good block corresponding to the specific channel by an invalid record;
• wherein the controller that executes the program code by utilizing the microprocessor stores a previous version of the spare good block table into the Flash memory, and stores a copy version of the spare good block table into a first buffer of the controller, for use of dynamically updating the spare good block table;
• the controller stores a previous version of a meta block mapping table into the Flash memory, and stores a copy version of the meta block mapping table into a second buffer of the controller;
• and the controller stores a latest version of the spare good block table within the first buffer and a latest version of the meta block mapping table within the second buffer into the Flash memory, in order to replace the previous version of the spare good block table and the previous version of the meta block mapping table;
• wherein each of blocks comprised in the meta block is corresponding to different Flash memory chip.