Redundant microprocessor control system using locks and keys

Details Redundant microprocessor control system using locks and keys Redundant microprocessor control system using locks and keys

1989-06-28

1992-08-04

Baker, Stephen M.

Boots, shoes, and leggings

364DIG1, 3642679, 3642681, 371 91, 371 163, 371 683, G06F 1120, G06F 1130

Patent

active

051367041

ABSTRACT:
A redundant processing system includes a pair of processors, each processor having an error detector, a key generator, and a lock circuit. The error detectors sense the outputs generated by their processors and generate an error signal when defective data is sensed. The key generators develop multi-bit codes of known patterns that are disrupted in response to receipt of an error signal from an error detector. The codes generated by the key generators are supplied to lock circuits which produce the same known multi-bit codes, and which compare their own codes to the codes supplied by the key generators. If a mis-match is detected, it will be due to a disrupted code that resulted from an error signal. Data from the processor associated with the error signal is rejected.

REFERENCES:
patent: 4649537 (1987-03-01), Rosswurm et al.
patent: 4916704 (1990-04-01), Bruckert et al.
Iyengar, V. et al., "Concurrent Fault Detection in Microprogrammed Control Units", IEEE Trans. on Computers, vol. C-34, No. 9, Sep. 1985, pp. 810-821.
Kirrman, H., "Fault Tolerance in Process Control", IEEE Micro, Oct. 1987, pp. 27-50.
Ciminiera, L. et al., Advanced Microprocessor Architectures, copyright 1987 Addison-Wesley Publishers Ltd., pp. 84-88.
Brumm, D. et al., 80386 A Programming and Design Handbook, 1987, TAB Books Inc., pp. 28-42.
"The Theory and Practice of Reliable System Design" by Siewiorek and Swarz, Digital Press, 1982. pp. 141-145.

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