Hi,
I'm looking for a high-speed PCI express example, like the one given in this video:
but obviously my google-fu is failing me because I can't find an example matching the video.
Does anyone have a DMA example as he shows, or something similar. I've been using Xillybus thus far, which is great but isn't useful for high-speed transfers.
Advance thanks, Karol.
Hi,
Never heard of Xillybus before, so I was curious to take a look at it.
Why is it not useful for high-speed transfers? Page 17 of this manual discusses high speed IO. I only skim read it, but it seems to discuss the relevant technique, mapping user space RAM as a DMA buffer.
Rupert
Hi Rupert,
On his website, he says the limits are about 400 MB/s for most devices, which is nothing like the PCIe bandwidth (assuming you've more than one lane).
The limitation seems to be due to the bus width/CPU overhead. The author explains it here:
To talk to another device, I'll have to write my own driver I think. That's probably too much work for what I want so, I'll probably use some sort of high speed Gb connection.
If you don't need warp-speed, I'd still recommend xillybus. It's extremely easy to use, even for a n00b like me.
Thanks for the resp> >
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