Region descriptor management method and electronic apparatus thereof

An electronic apparatus, comprising:

• a host system comprising a memory module;
• a storage device;
• and
• a device controller, coupled between the host system and the storage device,
• wherein the device controller fetches a plurality of region descriptor entries from a region descriptor table of the host system, wherein each of the plurality of region descriptor entries comprises a block initial address and a block length to correspondingly describe a memory block of the memory module,
• wherein according to the block initial addresses and the block lengths of the plurality of region descriptor entries, the device controller adjusts a portion of the plurality of region descriptor entries to be at least one current region descriptor entry, and based on the at least one current region descriptor entry, the device controller generating a current region descriptor table.