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:
Mar. 23, 2010
Filed:
Jan. 08, 2008
James N. Dieffenderfer, Apex, NC (US);
Bernard C. Drerup, Austin, TX (US);
Jaya P. Ganasan, Youngsville, NC (US);
Richard G. Hofmann, Apex, NC (US);
Thomas A. Sartorius, Raleigh, NC (US);
Thomas P. Speier, Holly Springs, NC (US);
Barry J. Wolford, Austin, TX (US);
James N. Dieffenderfer, Apex, NC (US);
Bernard C. Drerup, Austin, TX (US);
Jaya P. Ganasan, Youngsville, NC (US);
Richard G. Hofmann, Apex, NC (US);
Thomas A. Sartorius, Raleigh, NC (US);
Thomas P. Speier, Holly Springs, NC (US);
Barry J. Wolford, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and structure for snooping cache memories of several snooping masters connected to a bus macro, wherein each non-originating snooping master has a cache memory, and wherein some, but less than all the cache memories, may have the data requested by an originating snooping master and wherein the needed data in an non-originating snooping master is marked as updated, and wherein a main memory having addresses for all data is connected to the bus macro. Only those non-originating snooping masters which may have the requested data are queried. All the non-originating snooping masters that have been queried reply. If a non-originating snooping master has the requested data marked as updated, that non-originating snooping master returns the updated data to the originating snooping master and possibly to the main memory. If none of the non-originating snooping masters has the requested data marked as updated, then the requested data is read from main memory.