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. 31, 2009
Filed:
Oct. 11, 2004
Applicant:
Dave Olson, Palo Alto, CA (US);
Inventor:
Dave Olson, Palo Alto, CA (US);
Assignee:
QLOGIC, Corporation, Aliso Viejo, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 13/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
Preferred embodiments of the present invention increase the efficiency of access to a constructed list of memory locations, or DMA list by a host processor. In order to circumvent the problem of latency between an I/O device and the host processor, preferred embodiments of the present invention store a copy of the DMA head pointer in the system memory, as well as on the I/O device. When the head pointer data is changed on the I/O device, the I/O device will use DMA to write the updated head pointer back to system memory.