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. 11, 2006
Filed:
Apr. 29, 2003
Kenji Matsubara, Tokyo, JP;
Toshihiko Kurihara, Hadano, JP;
Hiromitsu Imori, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An information processing system which includes a main memory, a processing unit which executes a prefetch instruction included as one of a plurality of instructions of a program in the main memory, an internal cache controlled as a first level cache, and a cache control function which controls an external cache external of the processing unit as a second level cache. The prefetch instruction, when executed, causes the processing unit to selectively perform a prefetch operation by transferring operand data to be used in a subsequent load instruction from the main memory to the first and second level caches or the second level cache only, prior to executing the subsequent load instruction. The prefetch instruction includes a plurality of indication bits for specifying cache levels to which the operand data is to be transferred.