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:
May. 08, 2012
Filed:
Apr. 06, 2009
Kinjal Dave, Vinayaka Nagar, IN;
Saran Kumar Seethapathi, Neyveli, IN;
Roma Kundu, Ghaziabad, IN;
Rahoul Kumar Varma, Cambridge, GB;
Kinjal Dave, Vinayaka Nagar, IN;
Saran Kumar Seethapathi, Neyveli, IN;
Roma Kundu, Ghaziabad, IN;
Rahoul Kumar Varma, Cambridge, GB;
ARM Limited, Cambridge, GB;
Abstract
A data processing apparatus and method has a plurality of processing units, at least one of which is configured to be switchable between an active power state and a dormant power state and the units share a memory, and at least one local storage unit is configured to store a local copy of a data item stored in the memory for access by an associated processing unit. A snoop control unit is monitors memory access requests and when one is issued, if the control unit has an indication that a local storage unit belonging to another dormant processing unit has a local copy of that data storage item and a cache coherency protocol required that the local copy of the requested data item associated with the other processing unit be invalidated, the control unit stores a marker indicating that that other local copy should later be invalidated.