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:
Jul. 17, 2001
Filed:
Aug. 14, 1998
Naohiko Irie, Kawasaki, JP;
Naoki Hamanaka, Tokyo, JP;
Tsuyoshi Tanaka, Tokyo, JP;
Masabumi Shibata, Kawasaki, JP;
Atsushi Nakajima, Hadano, JP;
Hitachi, LTD, Tokyo, JP;
Abstract
A cache status report sum up for use in a multiprocessor system having a plurality of processor units each having a processor and a cache memory and a plurality of memory units. The cache status report sum up apparatus sums up cache coherency check results indicating statuses of the cache memories without limiting the number of memory access requests requiring cache coherency checks that can be overlapped when the memory access requests requiring cache coherency checks are executed in an overlapping manner. The cache status report sum up apparatus is provided between the processor units and the memory units and sums up cache coherency check results sent by cache status reporting apparatus included in each processor unit. The cache status reporting apparatus responds to a memory access request requiring a cache coherency check. The cache status report sum up apparatus, after summing up the cache coherency check results, sends the summary of the cache coherency check results to the processor unit which requested the memory access request requiring a cache coherency check.