http://en.wikipedia.org/wiki/Direct_memory_access
http://en.wikipedia.org/wiki/UDMA
DMA is an essential feature of all modern computers, as it allows
devices to transfer data without subjecting the CPU to a heavy load.
Otherwise, the CPU would have to copy each piece of data from the
source to the destination. This is typically slower than copying
normal blocks of memory since access to I/O devices over a
peripheral bus is generally slower than normal system RAM.
During this time the CPU would be unavailable for other tasks.
http://en.wikipedia.org/wiki/Programmed_input/output
The programmed input/output (PIO) interface was the original
method used to transfer data between the CPU
(through the ATA controller) and an ATA device.
The PIO interface is grouped into different modes that
correspond to different transfer rates.
--
cheers ;))
balthaZor <balthazor[at]oprekpc.com>
http://www.oprekpc.com/forum/
||||||||||||||||||||||||original message|||||||||||||||||||||||||>
Friday, May 26, 2006, 8:03:49 PM,
"hoeda hoeda" <[EMAIL PROTECTED]> wrote:
> UDMA = Ultra Direct Memory Acces
> yang PIO ga tau deh, tapi yang jelas PIO itu lebih lelet dari pada
> UDMA
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