G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 11/16 (2006.01) G06F 9/38 (2006.01) G06F 11/18 (2006.01) G06F 15/16 (2006.01)
Patent
CA 2073151
ABSTRACT OF THE DISCLOSURE An internal fault of an information processing system, particularly a primary processor for effecting information processing, is detected by pipeline process- ing using a redundant processor which is functionally identical to and effects the same information processing as the primary processor with a one-cycle delay with respect thereto. The information processing system includes a comparator having three pipeline stages. In the first pipeline stage, an input signal supplied to the primary processor and an output signal produced by the primary processor are introduced. In the second pipeline stage, the input signal is supplied to the redundant processor, which processes the supplied input signal. The second stage simultaneously introduces the processed signal from the redundant processor as an output signal thereof and the output signal from the primary processor. Finally, an output signal comparator in the third pipe- line stage compares the output signal from the primary processor and the output signal from the redundant proc- essor, and indicates an internal fault of the primary processor if the compared output signals disagree. The primary and redundant processors may comprise general- purpose processors. Internal faults of the information processing system can be detected without impairing the processing capability of the processors.
Corporation Nec
Smart & Biggar
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