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. 11, 1987
Filed:
Jun. 30, 1983
James W Keeley, Hudson, NH (US);
Robert V Ledoux, Litchfield, NH (US);
Virendra S Negi, Pepperell, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
A multilevel set associative cache system whose directory and cache store are organized into levels of memory locations includes control apparatus which selectively degrades cache operation in response to error signals from directory error checking circuits to those levels detected to be free from errors. Test apparatus coupled to the control apparatus and operates to selectively alter the operational states of the cache levels in response to commands received from a central processing unit for enabling testing of such control apparatus in addition to the other cache control areas.