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:
Oct. 27, 1998
Filed:
Jul. 08, 1996
Taizo Sato, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A hierarchical memory system having a cache memory for storing a portion of data stored in a main memory. The cache memory is divided into hierarchically ordered primary and secondary cache memories. The primary cache memory being connected to a processor. The larger secondary cache memory being connected to the primary cache memory and to a bus connected to the main memory. When a cache miss-hit is made in the secondary cache memory, at the time of access by the processing unit, the secondary cache memory notifies the primary cache memory of an address of a replacement entry prior to seeking a data transfer. The primary cache memory, when it has an entry corresponding to the replacement entry, makes the corresponding entry the replacement entry. When the primary cache memory does not have an entry corresponding to the replacement entry, the primary cache memory makes an entry based on a predetermined replacement priority and then enters data transferred from the secondary cache memory into the replacement entry.