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. 03, 2007
Filed:
Dec. 20, 2004
Takashi Hotta, Hadano, JP;
Toshihiko Kurihara, Hadano, JP;
Shigeya Tanaka, Hitachi, JP;
Hideo Sawamoto, Machida, JP;
Akiyoshi Osumi, Hitachi, JP;
Koji Saito, Hadano, JP;
Kotaro Shimamura, Hitachi, JP;
Takashi Hotta, Hadano, JP;
Toshihiko Kurihara, Hadano, JP;
Shigeya Tanaka, Hitachi, JP;
Hideo Sawamoto, Machida, JP;
Akiyoshi Osumi, Hitachi, JP;
Koji Saito, Hadano, JP;
Kotaro Shimamura, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A data processor has a first cache memory with a large capacity and one port and a second cache memory with a small capacity and two ports disposed between a main memory and an instruction processing section. Data which is frequently used is stored in the first cache memory and data which is less frequently used is stored in the second cache memory under control of a controller responsive to prefetch instructions. One of the cache memories may be a set associative cache memory composed of a plurality of memory chips each having at least two memory banks and an output part to gain access to data sets consecutively and one at a time within the memory banks. On the basis of an address sent from the instruction processing section, a memory bank is selected, and a data set from the selected memory bank is supplied to the processing section.