Can someone point to me a direction to start on "Ultra DMA"?
I tried to google... I think it is a kind of "PCI DMA". But I cannot find the hardware programming information that i need.
What is the difference between Multi-word DMA and Ultra DMA?
I have the experience of programming PIO mode. And Sound Blaster DMA (but i think this DMA is different from Ultra DMA).
You can get some information on the drive/controller-related aspects of UDMA from the ATA/ATAPI standards. The draft versions, the last of which is usually very close to the finished standard, are available for download here (the finished standards are also available, but for a substantial fee):
http://www.t13.org
For information on the DMA aspects you could try the Intel documentation for the relevant chipset component.
I already have the draft ATA standards from www.t13.org
Now, is programming the DMA very chipset dependent? or most chipset follow a "standard"?
Programming the DMA is what I need to know now.
I think it is fairly well standardized, with the other chipset makers following Intel's lead.
Can anyone tell me what keyword to search for the intel documentation?
For the recent chipsets the component that contains the IDE controller and the DMA controller that the IDE controller uses is the I/O Controller Hub (ICHx, where x is a version number).
You can find chipsets listed under products on the home page, and the documentation on the "technical documents" tab on the page for the particular chipset.
Intel® 82801EB (ICH5), 82801ER (ICH5R), 82801DB (ICH4), 82801CA (ICH3), 82801BA (ICH2), 82801AA (ICH), and 82801AB (ICH0) IDE Controller Programmer's Reference Manual:
http://www.intel.com/design/chipsets/manuals/298600.htm