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. 29, 2018
Filed:
Jan. 28, 2016
Silicon Laboratories Inc., Austin, TX (US);
SILICON LABORATORIES INC., Austin, TX (US);
Abstract
A processor, such as a low-cost microcontroller unit, uses a DMA controller to facilitate direct memory transactions between hardware subsystems independently of the CPU. To enable those transactions to be carried out security, gateways are provided to the DMA controller and peripheral bridge. The gateways, which have access to multiple access policies, switch between those policies depending on a hardware context and/or subcontext, such as the bus master originating the transaction and/or the DMA channel associated with the transaction. The gateways are operable to administer those policies independently of the CPU. In various implementations, gateways are provided for the DMA controller, the peripheral bridge, and/or individual peripherals. The processor is able to support secure, fully containerized operations involving its peripherals without constant CPU intervention.