Command executing method, memory controller and memory storage apparatus

A memory controller, comprising:

• a memory interface configured to be coupled to a rewritable non-volatile memory module;
• a host interface configured to couple to a host system;
• a buffer memory;
• a memory management circuit coupled to the memory interface, the host interface and the buffer memory;
• a command receiving circuit coupled to the memory management circuit;
• a command executing control circuit coupled to the memory management circuit;
• and
• an encryption/decryption circuit coupled to the command executing control circuit,
• wherein the memory management circuit is configured to group a plurality of logical addresses into a plurality of logical address groups and respectively assign a plurality of keys to the logical address groups, wherein each of the keys is assigned independently to one of the logical address groups,
• wherein the command receiving circuit is configured to receive a write command and write data corresponding to the write command from the host system and temporarily store the write data into the buffer memory, wherein the write data includes a plurality of sector data, the write command indicates writing the plurality of sector data into a plurality of target logical addresses among the logical addresses and the target logical addresses belong to at least two different logical address groups,
• wherein the command executing control circuit is configured to execute the write command and enable a direct memory access once to transfer the write data from the buffer memory to a rewritable non-volatile memory module of the memory storage apparatus, and the encryption/decryption circuit is configured to encrypt the plurality of sector data of the transferred write data with the keys corresponding to the logical address groups of the target logical addresses.

A memory storage apparatus, comprising:

• a connector configured to electrically connect to a host system;
• a rewritable non-volatile memory module;
• and
• a memory controller coupled to the connector and the rewritable non-volatile memory module,
• wherein the memory controller is configured to group a plurality of logical addresses corresponding to the memory storage apparatus into a plurality of logical address groups,
• wherein the memory controller is further configured to assign a plurality of keys to the logical address groups respectively, wherein each of the keys is assigned independently to one of the logical address groups,
• wherein the memory controller is further configured to receive a write command and write data corresponding to the write command from the host system and temporarily store the write data into the buffer memory, wherein the write data includes a plurality of sector data, the write command indicates writing the plurality of sector data into a plurality of target logical addresses among the logical addresses and the target logical addresses belong to at least two different logical address groups,
• wherein the memory controller is further configured to execute the write command, enable a direct memory access once to transfer the write data from the buffer memory to a rewritable non-volatile memory module of the memory storage apparatus and encrypt the plurality of sector data of the transferred write data with the keys corresponding to the logical address groups of the target logical addresses.