Intel IXP400 manual DMA Access-Layer API, Access-Layer Components DMA Access Driver IxDmaAcc API

Intel® IXP400 Software

Access-Layer Components: DMA Access Driver (IxDmaAcc) API

•IxDmaAcc has no knowledge on the devices that involve in the DMA transfer. The client is responsible for ensuring the devices are initialized and configured correctly before request for DMA transfer.

8.5Dependencies

Figure 43 shows the functional dependencies of IxDmaAcc component. IxDmaAcc depends on:

•Client component using IxDmaAcc for DMA transfer access

•ixQMgr component to configure and use the Queue Manager hardware queues

•OSAL layer for error handling

•NPE to perform DMA transfer

Figure 43. ixDmaAcc Dependencies

	Client
	IxDmaAcc
QMgr	ixOsal
NPE
	B2357-02

8.6DMA Access-Layer API

One of the primary roles of the IxDmaAcc is to provide DMA services to different clients. These DMA services are offered through a set of functions that initialize, transfer, and display the data that needs direct memory access.

April 2005	IXP400 Software Version 2.0	Programmer’s Guide
116	Document Number: 252539, Revision: 007