One-time programmable data security system for programmable logic device
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United States of America Patent
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-
Dec 12, 1989
Issued Date -
N/A
app pub date -
Jul 7, 1986
filing date -
Mar 4, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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