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:
Jul. 18, 1989
Filed:
Sep. 04, 1987
Tiziano Maccianti, Pregnana Milanese, IT;
Luciano Raimondi, Milan, IT;
Bull HN Information Systems Italia S.p.A., Caluso, IT;
Abstract
A fault tolerant computer architecture in which a functional unit is duplicated and the input and output signals to and from the two units are compared with each other by comparators to provide an error signal in case of different behavior of the two units, resulting in different input/output signals. The operation of both functional units is controlled by a first read only control memory or alternatively by a second read/write control memory once it has been loaded with microprograms, under control of the first read only control memory. The correct behavior of the comparators is tested in a diagnostic mode by having one functional unit operated under control of the first memory and the other functional unit operated under control of the second memory, so that the two units are controlled to perform different functions which force the comparators to produce an error indication, the absence of which indicates that the comparators operation is faulty.