Gate circuit for bus signal lines

Details Gate circuit for bus signal lines Gate circuit for bus signal lines

1988-02-05

1990-07-31

Smith, Jerry

Excavating

364186, 371 225, G06F 1100

Patent

active

049455400

ABSTRACT:
A failure detecting gate circuit for bus signal lines. The gate circuit include gate elements connected to each bus line and controlled by control signal, and a processing unit which controls any one of the gate elements. The processing unit operates to switch the gate elements to an "ON" state when the control signals are supplied to the gate elements of each gate. The failure detecting circuit outputs an indication signal of a failure condition in the processing unit. This occurs when control signals are supplied, such that at least two gate elements are to be switched to the "ON" state simultaneously. The improvement of the present invention over previous devices is a multiplexer which outputs one of two signals indicating either a failure condition or a normal signal provided by the microcontroller.

REFERENCES:
patent: 3860908 (1975-01-01), Stratton, III
David F. Stout et al., Handbook of Microcircuit Design and Application, 1987, McGraw-Hill Pub., pp. 11-3, 16-11, 27-29, 27-30.
Curlander, P., "Indicating Control-Circuit Detected Errors", IBM Technical Disclosure Bulletin, vol. 19, No. 8, Jan. 1977, pp. 2935-2936.

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