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:
Jun. 26, 1990
Filed:
Aug. 23, 1985
Kunio Uchiyama, Hachioji, JP;
Atsushi Hasegawa, Koganei, JP;
Takeshi Aimoto, Matsudo, JP;
Tadahiko Nishimukai, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer, Tokyo, JP;
Abstract
A cache memory contained in a processor features a high efficiency in spite of its small capacity. In the cache memory control circuit, it is detected whether the access operation of the processor is directed to a particular region of the memory, and when the data is to be read out from, or is to be written onto, the particular region, the data is copied onto the cache memory and when the data is to be read out from other regions, operation of the memory is executed immediately without waiting for the reference of cache memory. By assigning the particular region for the data that is to be used repeatedly, it is possible to provide a cache memory having good efficiency in spite of its small capacity. A representative example of such data is the data in a stack.