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. 25, 1990
Filed:
Jul. 27, 1987
Applicant:
Inventor:
Thomas H Holman, Jr, Austin, TX (US);
Assignee:
Motorola Computer X, Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364200 ; 3642292 ; 36424343 ; 36424344 ; 3642645 ;
Abstract
A 'write-shared' cache circuit for multiprocessor systems maintains data consistency throughout the system and eliminates non-essential bus accesses by utilizing additional bus lines between caches of the system and by utilizing additional logic in order to enhance the intercache communication. Data is only written through to the system bus when the data is labeled 'shared'. A write-miss is read only once on the system bus in an 'invalidate' cycle, and then it is written only to the requesting cache.