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:
Sep. 18, 1979
Filed:
Sep. 25, 1978
Clarence W DeKarske, St. Paul Park, MN (US);
Sperry Rand Corporation, New York, NY (US);
Abstract
A set associative cache buffer organized with 2.sup.n blocks per set requires only 2n-1 age bits for determining the replacement block within a set. When the cache buffer is addressed and the data sought is not found therein, the age bits determine which block of data in the set should be replaced with new data from the main memory. The block replaced may be either the least recently used block or one of the two least recently used blocks. The replacement logic is such that the buffer may be expanded from two to four blocks per set with minimal impact on the replacement logic. In addition, provision is made for disabling faulty blocks thus allowing the cache buffer and main memory behind it to be utilized in a degraded mode.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile