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US 6,747,481 B1Granted
Adaptive algorithm for electrical fuse programming
AssigneeTexas Instruments Incorporated
InventorRobert L. Pitts
Life of this patent
Estimating the term…
Abstract
This invention describes a means for preventing eFuses from growing back under successive programming pulses after being successfully fused by an earlier set of programming pulses. The solution is achieved through the use of an adaptive programming algorithm for blowing the eFuses. In the adaptive algorithm once a high enough resistance on a blown eFuse has been attained it will not receive additional programming pulses that could cause it to become measurably lower resistance.
Claims4
A method of programming electrical fuses comprising the steps of:
- reading the desired data for a array of fuses to be programmed from a programmation source;
- programming the array of fuses by applying a programmation pulse to fuses where a corresponding bit of the desired data has a first digital state, and applying no programmation pulse to fuses where a corresponding bit in the desired data has a second digital state;
- and
- repeating the sequence of
- reading the programmation of the fuses,
- programming the array of fuses by applying a programmation pulse to fuses where a corresponding bit of the desired data has a first digital state and the read state of the fuse fails to match the corresponding bit of the desired state, applying no programmation pulse to fuses where a corresponding bit in the desired data has a second digital state, and applying no programmation pulse to fuses where a corresponding bit of the desired data has a first digital state and the read state of the fuse matches the corresponding bit of the desired state,
- until all fuses match the corresponding bit of the desired state.
4 more elements
Dependencies are inferred from the claim text.