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:
Sep. 29, 1987
Filed:
Aug. 29, 1985
Applicant:
Inventors:
Assignee:
International Computers Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 67 ; 371 22 ; 371 11 ;
Abstract
Data processing apparatus includes a number of units connected by a bus over which each unit can send public write messages to all the other units in parallel. The units are connected in a loop by means of public write acceptance lines. Whenever a unit receives a public write message it sends an acceptance signal to the next unit in the loop. Each unit produces an error signal if it receives a public write message but does ot receive any corresponding acceptance signal, or if it receives an acceptance signal without having received a corresponding public write message. Thus, each unit checks its neighbors in the loop to ensure correct reception of the messages.