Memory device and operation method thereof

1. An operation method of a memory device, comprising:

performing a program operation on a memory block in response to a program command from a controller; and

applying a program voltage to a dummy word line coupled to dummy cells within the memory block such that the dummy cells have an indication threshold voltage higher than a normal pass voltage and providing a program fail signal to the controller when the program operation fails.

2. The operation method of claim 1 , wherein the performing of the program operation comprises:

precharging a selected bit line to a program permission voltage, and precharging an unselected bit line to a program inhibit voltage;

applying a pass voltage to an unselected word line;

increasing threshold voltages of selected memory cells by applying a program voltage to selected word line;

performing a verify operation to verify the selected memory cells; and

providing a program fail signal to the controller when detecting failure-mark data as a result of the verify operation.

3. The operation method of claim 2 , wherein the failure-mark data is detected when no current flows through bit lines coupled to the selected memory cells.

4. The operation method of claim 2 , wherein the performing of the verify operation comprises:

applying a verify voltage to the selected word line;

applying a pass voltage to unselected word lines; and

applying a normal pass voltage to the dummy word line.

5. The operation method of claim 4 , further comprising:

performing a normal read operation on a memory block in response to a read command from the controller;

retrying a read operation by applying a pass voltage higher than the indication threshold voltage to the dummy word line when the failure-mark data is read as the result of the normal read operation; and

providing the controller with data acquired as a result of the retrying.

6. A memory device comprising:

a memory block comprising memory cells and dummy cells;

a main word line coupled to the memory cells;

a dummy word line coupled to the dummy cells;

a voltage supply circuit suitable for:

performing a program operation on the memory block in response to a program command from a controller, and

applying a program voltage to the dummy word line such that the dummy cells have an indication threshold voltage higher than a normal pass voltage when the program operation fails; and

a control logic suitable for providing a program fail signal to the controller when the program operation fails.

7. The memory device of claim 6 ,

wherein, the voltage supply circuit performs the program operation by:

precharging a selected bit line to a program permission voltage, and precharging an unselected bit line to a program inhibit voltage,

applying a pass voltage to an unselected word line,

increasing threshold voltages of selected memory cells by applying a program voltage to a selected word line, and

performing a verification operation to verify the selected memory cells,

wherein the control logic provides the program fail signal to the controller when detecting failure-mark data as a result of the verify operation.

8. The memory device of claim 7 , wherein the failure-mark data is detected when no current flows through bit lines coupled to the selected memory cells.

9. The memory device of claim 7 , wherein the voltage supply circuit performs the verify operation by:

applying a verify voltage to the selected word line,

applying a pass voltage to unselected word lines, and

applying a normal pass voltage to the dummy word line.

10. The memory device of claim 9 ,

wherein the voltage supply circuit is further suitable for:

performing a normal read operation on a memory block in response to a read command from the controller, and

retrying a read operation by applying a pass voltage higher than the indication threshold voltage to the dummy world line when the failure-mark data is read as the result of the normal read operation,

further comprising a read/write circuit suitable for providing the controller with data acquired as a result of the retrying.

11. An operating method of a memory device, the operating method comprising:

applying, in response to a program command for a program-failed cell array, a program voltage to a dummy word line coupled to dummy cells within the program-failed cell array; and

providing, in response to a subsequent program command for the program-failed cell array, a program-failure signal when sensing failure-mark data from the program-failed cell array.

12. The operating method of claim 11 , further comprising:

reading, in response to a subsequent read command for the program-failed cell array, data from the program-failed cell array by increasing a pass voltage applied to the dummy word line when sensing the failure-mark data from the program-failed cell array.