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:
Apr. 09, 1996
Filed:
Oct. 22, 1992
Yasuhiro Inagami, Kodaira, JP;
Yoshiko Tamaki, Kodaira, JP;
Katsuyoshi Kitai, Hadano, JP;
Teruo Tanaka, Hachiouji, JP;
Tadayuki Sakakibara, Kunitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a multiprocessor system having a plurality of main memories and a shared extended memory, each main memory is associated with an extended memory partial write control. When an extended memory partial write instruction is issued, tag information identifying updated portions of main memory data is transferred to the associated extended memory partial write control along with the main memory data. Each time a subblock of the main memory data arrives, the extended memory partial write control performs a partial write operation to substitute those portions of the main memory data which are identified by the tag information for the corresponding portions of a data subblock in a specified extended memory area. During this partial write operation, that specified extended memory area is kept locked.