| Publisher | Phoenix Technologies | ||
|---|---|---|---|
| Format | PDF, requires Acrobat Rdr 5 | Date added | 29 Oct 2003 |
| Topics | Motherboards, Interfaces / Buses / I/Os | ||
| Downloads | 51 | ||
This white paper describes the Phoenix implementation of DMA for ATA disk drives, and how DMA applies to PCI. The ability of ATA devices to utilize Direct Memory Access (DMA) and the inability of the Peripheral Control Interface (PCI) bus to perform DMA operations has exposed several problems. This paper addresses two questions that are becoming particularly important for system designers. BIOS-Memory Manager Interface — How can the BIOS provide a DMA adapter with physical memory addresses needed for disk access? BIOS-PCI-DMA adapter usage — Is PCI DMA treated as a PnP resource, or part of a PCI device?
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