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:
Apr. 17, 2007
Filed:
Feb. 11, 2004
Paul Kimelman, Alamo, CA (US);
Ian Field, Walnut Creek, CA (US);
Richard Roy Grisenthwaite, Cambridge, GB;
Paul Kimelman, Alamo, CA (US);
Ian Field, Walnut Creek, CA (US);
Richard Roy Grisenthwaite, Cambridge, GB;
Arm Limited, Cambridge, GB;
Abstract
A data processing systemhaving a nested interrupt controllersupports nested active interrupts. The priority levels associated with different interrupts are alterable (possibly programmable) whilst the system is running. In order to prevent problems associated with priority inversions within nested interrupts, the nested interrupt controller when considering whether a pending interrupt should pre-empt existing active interrupts, compares the priority of the pending interrupt with the highest priority of any of the currently active interrupts that are nested together.