The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 1984
Filed:
May. 17, 1982
Abe Abramovich, Lawrenceville, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A fail-safe protection circuit for a data processor controlled system having a data bus for carrying data and comprising first logic for checking the operation of the data processor controlled system at periodic intervals not greater than T.sub.1 and for producing a trigger pulse at each check if the data processor is operating properly, second logic for detecting the absence of trigger pulses for a time period T.sub.2 to produce a control signal. Gating logic is responsive to the control signal to prevent the transmission of data through the data bus and a control circuit is also responsive to the control signal to reset the system to a predetermined operating state. The first logic responds to the resetting of the system to again produce the periodic trigger pulses if the system is operating properly.