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. 16, 2004
Filed:
Feb. 01, 2000
John Nels Fuller, Redmond, WA (US);
Georgios Chrysanthakopoulos, Kirkland, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A method and apparatus for directly creating a buffer of contiguous payload data from an incoming variable-length data stream utilizes a host controller for providing direct memory access (DMA) to a host computer memory. Payload data and header data from the data stream are stored contiguously in separate buffers in host memory. DMA descriptors, through appropriate software drivers, instruct the DMA engine of host controller to separate payload data and header data of each incoming packet on the data stream and place it in respective buffers in host memory. Thus, two separate logical buffers may be directly created from a single incoming logical variable-length data stream. Payload data is written directly and contiguously to host memory without the need for memory copies and the associated use of main processor resources.