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. 30, 2011
Filed:
Feb. 06, 2008
Daniel Kershaw, Cambridge, GB;
Lee Douglas Smith, Sawston, GB;
David James Seal, Cambridge, GB;
Richard Roy Grisenthwaite, Guilden Moreden, GB;
Daniel Kershaw, Cambridge, GB;
Lee Douglas Smith, Sawston, GB;
David James Seal, Cambridge, GB;
Richard Roy Grisenthwaite, Guilden Moreden, GB;
ARM Limited, Cambridge, GB;
Abstract
Memory address space is divided into domains and instruction access control circuitry is used to detect when the memory address from which an instruction to be executed is fetched has crossed a domain boundary and changed and in such cases to conduct a check to ensure that the instruction within the new domain is a permitted instruction of a permitted form. The permitted instruction can be arranged to be a no operation instruction other than in respect of the instruction access control circuitry, in order to assist backward compatibility.