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:
Mar. 01, 2022
Filed:
Mar. 12, 2019
Arm Limited, Cambridge, GB;
Andreas Lars Sandberg, Cambridge, GB;
Stephan Diestelhorst, Cambridge, GB;
Nikos Nikoleris, London, GB;
Ian Michael Caulfield, Cambridge, GB;
Peter Richard Greenhalgh, Cambridge, GB;
Frederic Claude Marie Piry, Cagnes sur Mer, FR;
Albin Pierrick Tonnerre, Nice, FR;
Arm Limited, Cambridge, GB;
Abstract
Coherency control circuitry () supports processing of a safe-speculative-read transaction received from a requesting master device (). The safe-speculative-read transaction is of a type requesting that target data is returned to a requesting cache () of the requesting master device () while prohibiting any change in coherency state associated with the target data in other caches () in response to the safe-speculative-read transaction. In response, at least when the target data is cached in a second cache associated with a second master device, at least one of the coherency control circuitry () and the second cache () is configured to return a safe-speculative-read response while maintaining the target data in the same coherency state within the second cache. This helps to mitigate against speculative side-channel attacks.