Patent · US Expired

Method and apparatus for accessing memories having a time-variant response over a PCI bus by using two-stage DMA transfers

US7047328B1 · kind B1 · utility

2Cited by

8References

26Claims

0Family size

Assignee

Legerity, Inc. · US

Inventors

Stephan Rosner · Campbell, US
Jörg Winkler · Ullersdorf, DE
Ralf Flemming · Baiersbronn, DE
Stephen T. Novak · Radebeul, DE

Key dates

Filing date	Jul 13, 2001
Grant date	May 16, 2006
Priority date	—
Expiry date	Jan 19, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG06F2213/0024
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

The invention relates to an apparatus and a method for accessing memories having a time-variant response over a PCI bus by using two-stage DMA transfers. The invention provides a method for executing a read request over a PCI bus by transferring the requested data from a main memory of a PCI card to a device located on the PCI bus, comprising the steps of obtaining an access request from a read access queue, transferring, by a first DMA transfer, the requested data from the main memory to a buffer memory on the PCI card, and transferring, by a second DMA transfer, the data from the buffer memory to the device.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.