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:
Aug. 25, 2009
Filed:
Jun. 29, 2006
Applicants:
Jeffrey D. Gilbert, Portland, OR (US);
Kai Cheng, Portland, OR (US);
Liqun Cheng, Salt Lake City, UT (US);
Inventors:
Jeffrey D. Gilbert, Portland, OR (US);
Kai Cheng, Portland, OR (US);
Liqun Cheng, Salt Lake City, UT (US);
Assignee:
Intel Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 13/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A snoop filter maintains data coherency information for multiple caches in a multi-processor system. The Exclusive Ownership Snoop Filter only stores entries that are exclusively owned by a processor. A coherency engine updates the entries in the snoop filter such that an entry is removed from the snoop filter if the entry exits the exclusive state. To ensure data coherency, the coherency engine implements a sequencing rule that decouples a read request from a write request.