请教9054的问题。（20分）

    我需要用9054做一块数据传输卡，要求是用DMA方式把FIFO里的数据传输到主机中存储。FIFO宽度8bit,要求传输速度能达到20MByte/s。
    我以前从来没接触过PCI的开发，看了一些资料，看被人好像是从主机端发起DMA,9054采用C模式。但具体怎样操作心里一点没底。我现在在看9054的Data Book，但时间紧，希望做过的大虾们给讲讲，这样我看资料也来得快。一点小分不成敬意，以后还要多多仰仗各位高手。

兄弟你用的FIFO是多大的？价格如何？

好象大于1M,价钱不清楚,没见过片子

[编辑 -  9/24/03 by  ilovehardware]

你知不知道如何用VHDL实现总线交换开关的功能?(7416212)

怎么没人回答啊：（ 是不是体的问题太弱了？  呵呵，没办法还没入门。迫切需要高手们来个醍醐灌顶 ：） 欢迎跟贴

PS: to louis_hioe兄,不好意思，我没做过你说的东西。

if you have plx9054 SDK/RDK you can just use the driver and test program, or you can use them as a reference to write your own.

to do dma from local bus fifo/memory to host memey is very simple with plx9054. focus on the DMA related registers and set them properly. basically you need to have following parameters ready:
1. local address;(the fifo access address on your board, this is constant normally)
2. target address;(physical address of host memory)
3. set the threshold;
4. set INT; (you can disable int during the testing)
5. start dma command;

after sometime, then you can check the data on host memroy.

谢谢hong老大的回答,前几天放假没上网,现在才给分,请见谅.
我现在正在看9054 data book,不懂的地方还得问你.