One-time programmable data security system for programmable logi

Details One-time programmable data security system for programmable logi One-time programmable data security system for programmable logi

1986-07-07

1989-12-12

Popek, Joseph A.

Static information storage and retrieval

Floating gate

Particular biasing

365218, 364200, 364716, G11C 1134, G06F 1100

Patent

active

048872393

ABSTRACT:
A data security fuse system is disclosed for allowing one-time programmability of protected data cells in a reprogrammable logic device, which may determine, for example, the logic architecture of the device. The system includes a fuse enable circuit which may be erased to the disabled state only prior to packaging of the device during manufacture. The protected data cells may be selected for programming by a decoder which decodes cell selection signals. A security fuse circuit is enabled by a fuse enable signal from the activated fuse enable circuit. The security fuse circuit allows the protected cells to be selected once for programming after the system has been activated, and thereafter defeats any attempts to access the protected data cells.

REFERENCES:
patent: 4590552 (1986-05-01), Guttag et al.
patent: 4609986 (1986-09-01), Hartmann et al.
patent: 4617479 (1986-10-01), Hartmann et al.

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