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AW: DMA transfer over PCI
Please take a look into the spec first to understand the basics of the bus.
1. The PCI bus is a multi master bus.
2. The minimum transfer size is one byte!
3. There is no central DMA engine available.
You can only transmit data over the PCI bus by DMA if your card is capable
to initiate a bus master access. The minimum size depends on the
implementation if this DMA engine (in the add-in card). Please take a look
into the spec of this card.
Von: Dinesh Kumar [mailto:email@example.com]
Gesendet: Freitag, 25. Oktober 2002 09:38
Betreff: DMA transfer over PCI
I have a PCI add-on card attached to Intel mother board. The on
board memory of target card is less (640 bytes ) so that it needs
to transfer the data very frequently to host. Is it possible to
initiate a burst DMA transfer for less volume of data. Is there
any minimum data volume requirement to trigger DMA across PCI.
Please suggest the references.
Thanks in advance