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:
May. 13, 2003
Filed:
Apr. 10, 2001
Hitachi, Ltd., Tokyo, JP;
Abstract
An information processing apparatus includes a data ownership table which is a list of processor numbers having data on each of lines in a level 2 cache. When data at an address pointed by a store instruction exists in the level 2 cache, the apparatus references the table to selectively issue an invalidation request only to a processor in which data at the address exists, but does not issue the request to a processor in which the data does not exist. The path busy ratio can be reduced and the data coherency among processors and a system controller can be maintained with a small amount of logics. When a system controller is divided into a plurality of interleaves operating independently of one another and respectively issuing an invalidation request, the requests issued from the interleaves are put into a queue, and requests having different destination processor numbers are simultaneously issued.
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