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:
Mar. 26, 1985
Filed:
May. 18, 1983
Brian J Procter, Broadbottom, GB;
International Computers Limited, London, GB;
Abstract
A data processing system consists of a number of modules such as integrated circuit chips, each of which receives a clock signal. Each module contains a checking circuit producing a failure signal which indicates whether or not the module is operating correctly. The clock signal is used to invert the sense of this failure signal in successive clock periods. Thus, the failure signal normally alternates between two values in successive clock periods, and its phase relative to the clock signal denotes whether or not a failure has been detected. However, if the clock supply to a module fails, or if the checking circuit itself fails, the failure signal from that module no longer alternates, but is frozen at one or other of the two values. This allows failure of the clock supply or of the checking circuit to be detected.