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:
Aug. 18, 1992
Filed:
Sep. 12, 1991
Masayuki Hata, Itami, JP;
Akira Yamada, Itami, JP;
Abstract
A least-recently-used (LRU) circuit determines a replaceable term needed for storing data newly loaded from cache memory for example. The circuit comprises a recently-used information storing means relating to the top priority order or the subordinative order among plural terms, and a least-recently-used determining means for determining which is the top priority term or the subordinative term in accordance with information stored in the recently-used information storing means. High speed processing is thus possible by simplified logical construction. Also, the circuit is provided with control means which directly or indirectly select the predetermined replaceable term, in situations where the determining means cannot properly determine the top-priority replaceable term. Therefore, even when the top-priority replaceable term is selected directly or indirectly, the cache memory can be securely prevented from discontinuing its own functional operation.