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:
Feb. 24, 2009
Filed:
Jun. 17, 2005
Steve L. Pope, Cambridge, GB;
Derek Roberts, Cambridge, GB;
David Riddoch, Cambridge, GB;
Ching Yu, Santa Clara, CA (US);
John Mingyung Chiang, San Jose, CA (US);
Der-ren Chu, San Jose, CA (US);
Steve L. Pope, Cambridge, GB;
Derek Roberts, Cambridge, GB;
David Riddoch, Cambridge, GB;
Ching Yu, Santa Clara, CA (US);
John Mingyung Chiang, San Jose, CA (US);
Der-Ren Chu, San Jose, CA (US);
Level 5 Networks, Inc., Sunnyvale, CA (US);
Abstract
Method and apparatus for retrieving buffer descriptors from a host memory for use by a peripheral device. In an embodiment, a peripheral device such as a NIC includes a plurality of buffer descriptor caches each corresponding to a respective one of a plurality of host memory descriptor queues, and a plurality of queue descriptors each corresponding to a respective one of the host memory descriptor queues. Each of the queue descriptors includes a host memory read address pointer for the corresponding descriptor queue, and this same read pointer is used to derive algorithmically the descriptor cache write addresses at which to write buffer descriptors retrieved from the corresponding host memory descriptor queue.