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. 23, 1995
Filed:
Dec. 23, 1992
Applicant:
Inventors:
Albert Chang, Austin, TX (US);
George A Lerom, Austin, TX (US);
James O Nicholson, Austin, TX (US);
John C O'Quin, III, Austin, TX (US);
John T O'Quin, II, Austin, TX (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
345425 ; 395275 ; 364D / ; 364D / ; 3642383 ; 3642397 ; 36424341 ; 3642456 ; 3642463 ; 3649262 ; 36492693 ; 3649393 ; 3649633 ; 3649642 ; 3649694 ;
Abstract
A cache for use with input/output devices attached to an input/output bus. Requests for access to system memory by an input/output device pass through the cache. Access authority is checked to determine whether an input/output device is authorized to access that particular page. If it is not, access is denied. Each input/output device has access to a portion of the cache, so that activity by one device will not interfere with activity by another.