Memory system and method of operating the same

1. A method of operating a memory system, comprising:

receiving a first program command, and performing an operation corresponding to the first program command;

receiving a second program command while performing the operation corresponding to the first program command;

delaying setting of a queue status register for the second program command by a first wait time;

receiving a third read command before the first wait time elapses; and

setting the queue status register for the third read command before setting the queue status register for the second program command.

2. The method according to claim 1 , further comprising performing, after the operation corresponding to the first program command is completed, an operation corresponding to the third read command based on a set status of the queue status register, and clearing the queue status register.

3. The method according to claim 2 , further comprising delaying, after the queue status register is cleared, setting of the queue status register for the second program command until a second wait time elapses.

4. The method according to claim 3 , further comprising:

receiving a fourth read command before the second wait time elapses; and

setting the queue status register for the fourth read command before setting the queue status register for the second program command.

5. The method according to claim 3 , wherein the second wait time is shorter than the first wait time.

6. The method according to claim 3 , further comprising setting, when the queue status register is cleared after the second wait time has elapsed, the queue status register for the second program command.

7. The method according to claim 6 , further comprising:

receiving, after setting the queue status register for the second program command, a fourth read command; and

performing, after the operation corresponding to the third read command is completed, an operation corresponding to the second program command based on a set status of the queue status register.

8. The method according to claim 7 , further comprising setting, after the queue status register for the second program command is cleared, the queue status register for the fourth read command without having a wait time.

9. The method according to claim 2 , further comprising setting, after the queue status register is cleared, the queue status register for the second program command.

10. The method according to claim 2 , further comprising:

receiving, after the first wait time has elapsed, a fourth read command before the operation corresponding to the first program command is completed; and

setting, after the queue status register for the third read command is cleared, the queue status register for the second program command without having a wait time.

11. The method according to claim 2 , further comprising:

receiving, after the first wait time has elapsed, a fourth read command before the operation corresponding to the first program command is completed; and

setting, after the queue status register for the third read command is cleared, the queue status register for the fourth read command without having a wait time.

12. The method according to claim 1 , further comprising:

clearing the queue status register for the first program command,

wherein the first wait time starts from a time at which the queue status register for the first program command is cleared.

13. A method of operating a memory system, comprising:

receiving a second program command while performing an operation corresponding to a first program command;

delaying setting of a queue status register for the second program command until a first wait time elapses;

receiving a third read command before the first wait time elapses;

setting the queue status register for the third read command before setting the queue status register for the second program command;

after the operation corresponding to the first program command is completed, starting an operation corresponding to the third read command based on a set status of the queue status register; and

after the operation corresponding to the third read command has started, delaying setting of the queue status register for the second program command until a second wait time elapses.

14. The method according to claim 13 , further comprising setting, when a new read command is not inputted from a host before the second wait time elapses, the queue status register for the second program command after the second wait time has elapsed.

15. The method according to claim 13 ,

further comprising clearing the queue status register for the first program command,

wherein the first wait time starts from a time at which the queue status register for the first program command is cleared.

16. A memory system, comprising:

a memory device; and

a memory controller,

wherein the memory controller is configured to sequentially receive a first command and a second command from a host and to delay setting of a queue status register for the second command when a third command is received from the host within a predetermined wait time of the first command.

17. The memory system according to claim 16 , wherein the first command is a program command.

18. The memory system according to claim 17 , wherein the memory controller is configured to set, when the second command is inputted from the host before the predetermined wait time elapses, the queue status register for the second command before setting the queue status register for the first command.

19. The memory system according to claim 18 , wherein the second command is a read command.

20. The memory system according to claim 16 , wherein the memory controller controls the memory device based on a set status of the queue status register.