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:
Jan. 03, 2017
Filed:
Dec. 14, 2010
Taichi Hirao, Tokyo, JP;
Hiroaki Sakaguchi, Kanagawa, JP;
Hiroshi Yoshikawa, Kanagawa, JP;
Masaaki Ishii, Saitama, JP;
Taichi Hirao, Tokyo, JP;
Hiroaki Sakaguchi, Kanagawa, JP;
Hiroshi Yoshikawa, Kanagawa, JP;
Masaaki Ishii, Saitama, JP;
SONY CORPORATION, Tokyo, JP;
Abstract
Data transfer between processors is efficiently performed in a multiprocessor including a shared cache memory. Each entry in a tag storage sectionof a cache memory holds a reference number fieldin addition to a tag address field, a valid field, and a dirty field. The reference number fieldis set in a data write, and the value thereof is decremented after each read access. When the value of the reference number fieldis changed from '1' to '0', the entry is invalidated without performing a write-back operation. When the cache memory is used for communication between processors in the multiprocessor system, the cache memory functions as a shared FIFO, and used data is automatically deleted.