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:
Jan. 27, 1998
Filed:
May. 18, 1995
Applicant:
Inventors:
Jeffrey S Kimmel, Chapel Hill, NC (US);
Elizabeth H Reeves, Westboro, MA (US);
Peter B Everdell, Littleton, MA (US);
Assignee:
Data General Corporation, Westboro, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395472 ; 395451 ; 395448 ;
Abstract
A multiprocessor cache control uses ping-pong bits to reduces the number of invalidate cycles on a shared system bus in a multiprocessor system with a plurality of caches when data is being updated by multiple CPUs. The ping-pong bit is used predict when sharing is taking place and convert read-shared requests into read-exclusive requests.