Memory controllers and operation methods thereof and memory systems

An operation method of a memory controller, wherein the memory controller comprises:

• a first buffer;
• a second buffer;
• and
• an acceleration processing circuit coupled to the first buffer and the second buffer, respectively, wherein the operation method comprises:
• buffering, by the first buffer, a valid data table and mapping update information, wherein the valid data table is to record a plurality of valid transmission unit counts, the valid transmission unit count indicates a number of transmission units that store valid data in a corresponding block, the mapping update information comprises at least one piece of mapping information from a logical address to a physical address, and each transmission unit corresponds to one physical address;
• buffering, by the second buffer, a mapping table, wherein the mapping table is to record a plurality of pieces of mapping information;
• and
• updating, by the acceleration processing circuit, the mapping table based on the mapping update information, and updating the valid data table based on the mapping update information.

A memory system, comprising:

• a memory device comprising a plurality of blocks;
• and
• a memory controller configured to control the memory device and update a valid data table, wherein the memory controller comprises:
• a first buffer configured to buffer the valid data table and mapping update information, wherein the valid data table is to record a plurality of valid transmission unit counts, the valid transmission unit count indicates a number of transmission units that store valid data in a corresponding block, the mapping update information comprises at least one piece of mapping information from a logical address to a physical address, and each transmission unit corresponds to one physical address;
• a second buffer configured to buffer a mapping table, wherein the mapping table is to record a plurality of pieces of mapping information;
• and
• an acceleration processing circuit coupled to the first buffer and the second buffer, respectively, and configured to:
• update the mapping table based on the mapping update information;
• and
• update the valid data table based on the mapping update information.