Method and device for programming anti-fuses
A device includes an anti-fuse including a first electrode that can be selectively coupled to a first voltage reference and a second electrode that can be selectively coupled to a second voltage reference. The device further includes a shunt transistor including a first current electrode coupled to the first electrode of the anti-fuse, a second current electrode coupled to the second electrode of the anti-fuse, and a control electrode. The device additionally includes control logic configured to disable the shunt transistor in response to a first program operation intended for the anti-fuse. The control logic also is configured to enable the shunt transistor in response to a second program operation not intended for the anti-fuse.
1. A method comprising:
disabling a first shunt transistor coupled in parallel with a first anti-fuse in response to initiation of a first program operation intended for the first anti-fuse;
enabling the first shunt transistor in response to initiation of a second program operation not intended for the first anti-fuse;
disabling a second shunt transistor coupled in parallel with a second anti-fuse in response to initiation of the second program operation, the second program operation intended for the second anti-fuse; and
enabling the second shunt transistor in response to initiation of the first program operation, the first program operation not intended for the second anti-fuse.
2. The method of claim 1 , wherein disabling the first shunt transistor comprises selectively disabling the first shunt transistor based on a proximity of the second anti-fuse to the first anti-fuse.
3. The method of claim 1 , further comprising:
disabling the first shunt transistor in response to initiation of a read operation for the first anti-fuse.
4. The method of claim 3 , further comprising:
determining, during the read operation, a fuse state of the first anti-fuse based on a voltage difference between electrodes of the first anti-fuse.
5. The method of claim 4 , further comprising:
controlling an operation of a component based on the fuse state.
6. The method of claim 1 , further comprising:
applying a program voltage to the first anti-fuse to program the first anti-fuse during the first program operation.
7. A device comprising:
a first anti-fuse comprising a first electrode coupleable to a first voltage reference and a second electrode coupleable to a second voltage reference;
a first shunt transistor comprising a first current electrode coupled to the first electrode of the first anti-fuse, a second current electrode coupled to the second electrode of the first anti-fuse, and a control electrode;
first control logic configured to disable the first shunt transistor in response to a first program operation intended for the first anti-fuse;
a second anti-fuse comprising a first electrode coupleable to the first voltage reference and a second electrode coupleable to the second voltage reference;
a second shunt transistor comprising a first current electrode coupled to the first electrode of the second anti-fuse, a second current electrode coupled to the second electrode of the second anti-fuse, and a control electrode; and
second control logic configured to enable the second shunt transistor in response to the first program operation.
8. The device of claim 7 , wherein the first control logic is configured to enable the first shunt transistor in response to a second program operation not intended for the first anti-fuse.
9. The device of claim 7 , wherein the first control logic is configured to disable the first shunt transistor in response to a read operation for the first anti-fuse.
10. The device of claim 9 , further comprising:
a fuse state module configured to determine a voltage difference between the first electrode and the second electrode of the first anti-fuse during the read operation.
11. The device of claim 10 , wherein the fuse state module comprises:
an output to provide a voltage representative of the voltage difference;
a first transistor comprising a first electrode coupled to the first voltage reference, a second electrode coupled to the output, and a control electrode to receive a first control signal, wherein the first transistor is enabled when the first control signal is in a first state and disabled when the first control signal is in a second state; and
a second transistor comprising a first electrode connected to the output, a second current electrode connected to the second voltage reference, and a control electrode to receive a second control signal, wherein the second control signal is an inverse of the first control signal and wherein the second transistor is enabled when the second control signal is in the first state and disabled when the second control signal is in the second state.
12. The device of claim 7 , wherein the second control logic is configured to disable the second shunt transistor in response to a second program operation intended for the second anti-fuse.
13. The device of claim 12 , wherein the first control logic is configured to enable the first shunt transistor in response to the second program operation.
14. A device comprising:
an array of anti-fuse cells, each anti-fuse cell comprising an anti-fuse and a shunt transistor coupled in parallel; and
a fuse control module configured to:
disable a first shunt transistor of a first anti-fuse cell of the array in response to a first program operation; and
enable a second shunt transistor of a second anti-fuse cell of the array in response to the first program operation, the first program operation intended for the first anti-fuse cell and not intended for the second anti-fuse cell.
15. The device of claim 14 , wherein the fuse control module is configured to:
disable the second shunt transistor in response to a second program operation; and
enable the first shunt transistor in response to the second program operation, the second program operation intended for the second anti-fuse cell and not intended for the first anti-fuse cell.
16. The device of claim 14 , wherein the fuse control module is configured to:
disable the first shunt transistor in response to a read operation for the anti-fuse of the first anti-fuse cell; and
disable the second shunt transistor in response to a read operation for the anti-fuse of the second anti-fuse cell.
17. The device of claim 14 , further comprising:
a fuse state module coupled to the first anti-fuse cell and configured to determine a fuse state of the anti-fuse of the first anti-fuse cell.
18. The device of claim 17 , further comprising:
an operational component coupled to the first anti-fuse cell and configurable based on the fuse state of the anti-fuse of the first anti-fuse cell.