Controller including multi processor and operation method thereof

An operating method of a controller including a memory having a first mailbox and a second mailbox having a lower mailbox priority than the first mailbox, a first processor and a second processor, the method comprising:

• sequentially storing, by the first processor, commands provided from a host into one of the first and second mailboxes according to types of the commands;
• and
• serving, by the second processor, the commands stored in the first and second mailboxes,
• wherein the first mailbox is suitable for storing a read command and the second mailbox is suitable for storing a write command,
• wherein the sequentially storing of the commands includes, when provided from the host is a first read command corresponding to the same logical address as a second write command stored in the second mailbox, storing the first read command into the first mailbox and storing into the memory a command priority information representing the second write command having a higher command priority than the first read command, and
• wherein the serving of the commands includes serving the commands stored in the first mailbox and the second mailbox by referring to the mailbox and the command priority overriding the mailbox priority.

A memory system comprising:

• a memory device;
• and
• a controller including a first mailbox and a second mailbox having a lower priority than the first mailbox, the first mailbox suitable for storing a read command and a second mailbox suitable for storing a write command, and the controller is suitable for:
• storing commands provided from a host into the first or second mailbox according to a type of each command,
• determining a sequence of the commands according to the priority of the mailbox to which each command belongs,
• rearranging the sequence of the commands by rearranging a sequence of commands corresponding to the same logical address according to a response sequence to the host, and
• wherein the sequence of the commands corresponding to the same logical address includes a first read command and a second write command, and the rearranging comprises storing the first read command into the first mailbox and storing a command priority information representing the second write command having a higher command priority than the first read command,
• controlling the memory device to perform an operation in response to the rearranged sequence of the commands by referring to the mailbox priority and the command priority overwriting the mailbox priority.