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:
Oct. 24, 2000
Filed:
Nov. 21, 1997
Applicant:
Inventor:
Kazumasa Hamaguchi, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
711141 ; 711142 ; 711143 ; 711144 ; 711145 ; 711146 ;
Abstract
In a data processing system where a plurality of nodes, each having a plurality of processors and cache memories associated with each of the processors, are connected via a bus, tag information is added to each data block stored in the cache memories. The tag information has state information which includes information (INTERNODE-SHARED) indicative of whether or not the data block is cached in another node. When a write-access is transmitted to the data block in the cache memory, if the state information added to the data block is INTERNODE-SHARED, invalidation of the data block is requested to the other node.