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:
May. 30, 1989
Filed:
May. 28, 1986
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Computer Engineering Corporation, Tokyo, JP;
Abstract
A cache system employing an LRU (Least Recently Used) scheme in a replacement algorithm of cache blocks and comprising a directory memory whose entires have LRU counter fields, a host system issuing a read/write command to which an arbitrary LRU setting value is appended, a directory search circuit, and a microprocessor. The directory search circuit searches the directory memory in response to the read/write command issued from the host system. The microprocessor stores the LRU setting value appended to the read/write command in the LRU counter field of the hit entry of the directory memory or of the entry corresponding to the replacement target cache block, in response to the search result of the directory search circuit.