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:
Sep. 27, 2011
Filed:
Sep. 22, 2009
Dominic Go, San Jose, CA (US);
Mark D. Hayter, Menlo Park, CA (US);
Zongjian Chen, Palo Alto, CA (US);
Weichun Ku, San Jose, CA (US);
Dominic Go, San Jose, CA (US);
Mark D. Hayter, Menlo Park, CA (US);
Zongjian Chen, Palo Alto, CA (US);
Weichun Ku, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
In one embodiment, a direct memory access (DMA) controller comprises a transmit control circuit, an offload engine, and a receive control circuit. The transmit control circuit is configured to read first DMA data from an address space in a host. Coupled to receive the first DMA data from the transmit control circuit, the offload engine is configured to perform at least a first operation on the first DMA data to produce a result. The offload engine is configured to at least start performing the first operation during a DMA transfer that provides the first DMA data to the offload engine. Coupled to the offload engine to receive the result, the receive control circuit is configured to write the result to the address space in the host according to a DMA descriptor data structure that describes the DMA transfer.