Method and apparatus for efficient determination of status from DMA lists
US7512721B1 · kind B1 · utility
26Cited by
7References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2004 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Jun 20, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/126
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.