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:
Jan. 16, 1996
Filed:
Nov. 04, 1993
Hiroaki Miyoshi, Tokyo, JP;
Yasuhiko Mizushima, Tokyo, JP;
Makoto Ohtsuka, Tokyo, JP;
Hiroki Hihara, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In each module (11) of three or more central processor modules of a fault tolerant computer system, a detector (45) receives a comparator output signal and like comparator output signals from two adjacent modules and produces a detector output signal which confirms absence and presence of a fault in one of the above-mentioned each module. When the fault is confirmed, a controller or processor (49) isolates the module under consideration from the system by inhibiting delivery of a controlled output signal to a bus (31) and by connecting, with the module in question bypassed, switching units (53(1), 53(2)) of the adjacent modules. Preferably, one of the modules of the system is used as a master module of ordinarily delivering the controlled output signal to the bus with others used as checker modules of ordinarily inhibiting the delivery. When a fault appears in the master module, its controller delivers a module operation switching signal to the controllers of the checker modules to thereby substitute one of the checker modules for the master module subjected to the fault.