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. 18, 2012
Filed:
Oct. 10, 2007
Frederic Claude Marie Piry, Cagnes-sur-Mer, FR;
Philippe Jean-pierre Raphalen, Valbonne, FR;
Norbert Bernard Eugéne Lataille, Le Cannet, FR;
Stuart David Biles, Little Thurlow, GB;
Richard Roy Grisenthwaite, Cambridgeshire, GB;
Frederic Claude Marie Piry, Cagnes-sur-Mer, FR;
Philippe Jean-Pierre Raphalen, Valbonne, FR;
Norbert Bernard Eugéne Lataille, Le Cannet, FR;
Stuart David Biles, Little Thurlow, GB;
Richard Roy Grisenthwaite, Cambridgeshire, GB;
ARM Limited, Cambridge, GB;
Abstract
A plurality of processing units for performing data processing operations require access to data in shared memory. Each has an associated cache storing a subset of the data for access by that processing unit. A cache coherency protocol ensures data accessed by each unit is up-to-date. Each unit issues a write access request when outputting a data value for storing in shared memory. When the write access request requires both the associated cache and the shared memory to be updated, a coherency operation is initiated within the cache coherency logic. The coherency operation is performed for all of the caches including the cache associated with the processing unit that issued the write access request in order to ensure that the data in those caches is kept coherent.