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:
Nov. 29, 2005
Filed:
Jun. 28, 2002
Robert E. Cypher, Saratoga, CA (US);
Andrew Phelps, Encinitas, CA (US);
Robert E. Cypher, Saratoga, CA (US);
Andrew Phelps, Encinitas, CA (US);
Sun Microsystems, Inc., Santa Clara, CA (US);
Abstract
Various systems and methods for using a directory based coherency protocol in a system that employs a split ownership and access right cache coherence mechanism are disclosed. A computer system may include a directory, several active devices configured to access data stored, an address network configured to convey coherence requests point-to-point between the active devices and the directory, and a data network configured to convey data between the active devices. If at least one of a subset of the active devices has a shared access right to a requested coherency unit, the directory is configured to send an invalidating address packet to each of the active devices in the subset. The subset contains fewer than all of the active devices.