Apparatus for verifying the execution of a sequence of coded ins

Details Apparatus for verifying the execution of a sequence of coded ins Apparatus for verifying the execution of a sequence of coded ins

1977-03-30

1978-08-22

Atkinson, Charles E.

Registers

Systems controlled by data bearing records

Time analysis

235306, 235312, G06F 1108

Patent

active

041083598

ABSTRACT:
Apparatus for detecting errors in the execution of a sequence of coded inuctions. The apparatus includes a feed-back shift register to generate a digital sequence which is combined with the sequence of instructions to be verified to compute a unique sequence checkword. This computed sequence checkword is compared with a stored, predetermined reference sequence checkword. If any errors have occurred in the execution of the sequence of instructions, the computed and the stored sequence checkwords will disagree, resulting in an output which may be used to halt the process or otherwise cause an alarm. It is an advantage of the apparatus, that it may be easily implemented with a minimum number of logic elements to produce a sequence monitoring device that has an extremely high probability of detecting errors.

REFERENCES:
patent: 3582633 (1971-06-01), Webb
patent: 3626206 (1971-12-01), Stebbins
patent: 3651315 (1972-03-01), Collins
patent: 3838264 (1974-09-01), Maker

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