Semiconductor device and method for operating the same
View Patent ↗A semiconductor device employs a technology for improving data retention characteristics of a cell array storing data regarding conditions for controlling internal operations of the semiconductor device. The semiconductor device includes a content addressable memory (CAM) cell array configured to store CAM data regarding conditions for controlling the internal operations, a control logic configured to store the CAM data read out of the CAM cell array, and a microprocessor configured to perform a reprogramming operation on the CAM cell array using the CAM data stored in the control logic.
1. A semiconductor device comprising:
a content addressable memory (CAM) cell array configured to store CAM data regarding conditions for controlling internal operations of the semiconductor device;
a control logic configured to store the CAM data read out of the CAM cell array and repair data corresponding to an error in the read-out CAM data; and
a microprocessor configured to control a reprogramming operation on the CAM cell array using the read-out CAM data and the repair data stored in the control logic.
2. The semiconductor device according to claim 1 , wherein the CAM data includes at least one of program voltage information, read voltage information, erase voltage information, and thickness information for a gate oxide film of a cell.
3. The semiconductor device according to claim 1 , further comprising:
a page buffer configured to read out the CAM data stored in the CAM cell array, temporarily store the read-out CAM data, and transfer the read-out CAM data to the control logic.
4. The semiconductor device according to claim 1 , wherein the control logic includes:
an error check unit configured to check whether or not there is an error in the CAM data read out of the CAM cell array; and
a register configured to store the read-out CAM data and erroneous data detected by the error check unit.
5. The semiconductor device according to claim 4 , wherein the error check unit is configured to detect whether or not there is an error using a majority decision scheme.
6. The semiconductor system according to claim 4 , wherein the repair data corresponds to the erroneous data.
7. The semiconductor device according to claim 1 , further comprising:
a voltage detector configured to detect an internal voltage during a power-on operation and provide a signal indicating the detected voltage to the microprocessor.
8. The semiconductor device according to claim 7 , wherein the microprocessor is configured to perform the reprogramming operation in response to the signal indicating the detected voltage after the power-on operation is completed.
9. The semiconductor device according to claim 1 , further comprising:
a command interface unit configured to receive a command signal for performing the reprogramming operation from an external part, and provide the command signal to the microprocessor.
10. The semiconductor device according to claim 9 , wherein the microprocessor is configured to perform the reprogramming operation upon receiving a specific command signal from the external part.
11. The semiconductor device according to claim 1 , further comprising:
a voltage generator configured to generate a voltage based on the read-out CAM data stored in the control logic.
12. The semiconductor device according to claim 11 , further comprising:
a row decoder configured to select a row line of the CAM cell array; and
a column decoder configured to select a column line of the CAM cell array.
13. The semiconductor device according to claim 1 , wherein the CAM cell array is configured to perform a reprogramming operation in the same CAM cell array according to a control signal of the microprocessor.
14. The semiconductor system according to claim 1 , wherein the microprocessor is configured to re-program data in the CAM cell array in response to the repair data stored in a register of the control logic.
15. A method for operating a semiconductor device, the method comprising:
reading data out of a content addressable memory (CAM) cell array, the data including information regarding conditions for controlling internal operations of the semiconductor device, and storing the read-out data in a register;
detecting an error in the read-out data, and storing repair data corresponding to the error in the register; and
reprogramming data in the CAM cell array using the read-out data and the repair data stored in the register.
16. The method according to claim 15 , wherein reading the data is performed within a predetermined period after a power-on operation is completed.
17. The method according to claim 15 , wherein the information regarding conditions for controlling the internal operations includes at least one of program voltage information, read voltage information, erase voltage information, and thickness information for a gate oxide film of a cell.
18. The method according to claim 17 , wherein detecting the error is performed using a majority decision scheme.
19. The method according to claim 17 , wherein reprogramming the data is performed in response to a specific command signal received from an external part.
20. The method according to claim 15 , wherein the CAM cell array is configured to perform a reprogramming operation in the same CAM cell array.