a request register configured to receive a first signal including a requester identifier using a first protocol from a host and configured to output a first priority corresponding to the requester identifier;

a checker module configured to receive a second signal including a command and a request type from the host and using a second protocol that is different than the first protocol, wherein the checker module is configured to receive the first priority from the request register, and wherein the checker module is configured to determine a second priority of the command based on the first priority and the request type;

a command generator configured to generate an internal command for memory operation based on the command; and

a memory controller configured to schedule the internal command in a command queue based on the second priority.