Reliable readout of fuse data in an integrated circuit

摘要

An integrated circuit includes fuse readout logic and first and second sets of fuses. One of the sets includes one or more primary fuses whose burn states represent respective bit values, and the other of the sets includes one or more secondary fuses whose burn states are indicative of the bit values stored in the primary fuses. The fuse readout logic is configured to read the bit values by sensing the burn states of the primary fuses, and to conditionally correct the read bit values by sensing the burn states of one or more of the secondary fuses.

主权项

1. An apparatus, comprising:
a first fuse array; a second fuse array; circuitry configured to:
read a first set bit values from the first fuse array;read a set of redundancy bit values from the first fuse array;check the first set of bit values for errors dependent upon the set of redundancy bit values; andread at least one bit value from the second fuse array in response to a determination that at least one error is present in the first set of bit values.