Logic operation device

Details Logic operation device Logic operation device

1988-04-29

1990-04-10

Fleming, Michael R.

Excavating

371 91, 371 683, G06F 1516

Patent

active

049166964

ABSTRACT:
A logic operation device operable at a high speed with a high reliability is disclosed. The logic operation device comprises a first, arithmetic and logic unit composed of a dynamic circuit of a precharge type, and a second, arithmetic and logic unit composed to a static circuit and having the same operational function as the first unit. When common data is supplied from an input register to the first and second units, the first unit generates a logic operation output earlier than the second unit does. The succeeding operation is therefore performed on the basis of this logic operation output from the first unit. As soon as the second unit generates an operation output, this is compared with that of the first unit. If the comparison results shows that both outputs are not the same, the subsequent operation on the basis of the logic operation output from the first unit is stopped.

REFERENCES:
patent: 4314349 (1982-02-01), Batcher
patent: 4562575 (1985-12-01), Townsend
patent: 4700292 (1987-10-01), Campanini
patent: 4703421 (1987-10-01), Abrant
patent: 4807228 (1989-02-01), Dahbura
"Fail-Safe Data Processing in Railway Signaling Systems", H. J. Lohmann, pp. 374-377, Siemens Forsch.ungs- and Entwicklungsberichte, vol. 7, (1978), No. 6.

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