System and method for storing parity information in fuses
AssigneeInfineon Technologies Richmond, LP
InventorsUlrich Zimmerman, Robert Petter
Life of this patent
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Abstract
A system and method for determining the accuracy of the states of fuses by changing, or not changing, the state of additional fuses. The system includes a memory including addressable storage elements, address fuses whereby each fuse includes a link in a connected or disconnected state and the collective state of the address fuses identifies an address value, a parity fuse whereby the fuse includes a link in a connected or disconnected state and the state of the parity fuse represents a parity value, the parity value being based on, but not equivalent to, the address of an addressable storage element, and; an output providing a value dependant upon the address value and the parity value.
Claims26
A system for determining the accuracy of address fuses comprising:
- a memory including addressable storage elements,
- address fuses whereby each fuse includes a link in a connected or disconnected state and the states of the address fuses collectively identify an address value,
- a parity fuse whereby the fuse includes a link in a connected or disconnected state and the state of the parity fuse represents a parity value, the parity value being based on, but not equivalent to, the address of an addressable storage element, and
- an output providing a value dependant upon the address value and the parity value.
A memory comprising:
- a memory including addressable storage elements,
- a fuse bank whereby the state of a first set of the fuses defines a first value and the state of a second set of fuses defines a second value based on the address of a storage element,
- a circuit structured and arranged to generate a signal indicative of whether the first value is different from the address of the storage element, the signal being based on the state of the first and second set of fuses.
A system for determining whether information actually stored on a device matches information that was to be stored on the device comprising:
- a plurality of fuses, each fuse having a state dependent upon the connection of a link of the fuse,
- a first set of said fuses such that the state of the fuses in the first set represents the information actually stored on the device,
- a second set of said fuses such that the state of the fuses in the second set represents information which is a function of the information that was to be stored on the device, and
- means for comparing the information represented by the first set of fuses against the information represented by the second set of fuses.
Dependencies are inferred from the claim text.