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:
Nov. 16, 1999
Filed:
Apr. 23, 1997
Hitachi, Ltd., Tokyo, JP;
Abstract
In a cache coherency control method of a multi-processor system comprising a plurality of cache systems of identical configuration-after 'method', for quickly determining consistency of a data block designated by a cache coherency request issued by other cache system a multi-processor system using the same, systems have identical configuration and each of the cache systems includes a history table for storing an address included in an access request flowing over a shared bus and a history table control circuit. The history table control circuit determines whether an address of a received access request is stored in the history table, and when the address is stored in the history table, suppresses the operation of a cache control circuit for the access request, and alternatively when the address is not stored in the address table, conducts the operation of the cache control circuit for the access request.