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:
Jun. 29, 2010
Filed:
Apr. 15, 2008
Jason F. Cantin, Madison, WI (US);
James S. Fields, Jr., Austin, TX (US);
Steven R. Kunkel, Rochester, MN (US);
William J. Starke, Round Rock, TX (US);
Jason F. Cantin, Madison, WI (US);
James S. Fields, Jr., Austin, TX (US);
Steven R. Kunkel, Rochester, MN (US);
William J. Starke, Round Rock, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A cache coherent data processing system includes at least first and second coherency domains each including at least one processing unit. The first coherency domain includes a first cache memory, and the second coherency domain includes a coherent second cache memory. The first cache memory within the first coherency domain of the data processing system holds a memory block in a storage location associated with an address tag and a coherency state field. The coherency state field is set to a state that indicates that the address tag is valid, that the storage location does not contain valid data, and that the memory block is likely cached only within the first coherency domain.