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Re: [Discuss-gnuradio] Re: PCIe know-how?

From: Brian Padalino
Subject: Re: [Discuss-gnuradio] Re: PCIe know-how?
Date: Sun, 4 Mar 2007 17:36:11 -0500

On 3/4/07, address@hidden <address@hidden> wrote:
It's a very nice chip, but it appears to be very expensive at $38... =(
TI's costs $7, which is quite affordable.

You get a lot for not a lot of money in comparison to writing and
validating your own Transaction and Data Link layers for a PCIe PHY.
If simplicity is your friend, the extra $31 might possibly be the best
money you could spend.

On the other hand, if you don't even want to pay $7 for a PCIe PHY -
Lattice Semiconductor makes a low cost FPGA with DSP blocks (MAC
included, not just MULT) that also have SERDES lines to them.

You can even get a quick PCIe dev board from them here:


I'm not sure how to address the IP core issue yet. The Open Graphics
project will have to deal with it sooner or later, but I hope we will
coordinate efforts. I told them what I had discovered so far, but I'll
have to see how that discussion turns out before I can say if it'll be
any help. If you know anything about the problems I need to solve, I'd
love to hear about it. :)

I am not sure how their IP solution works, but you can try to contact
their representatives and try to help figure it all out.  It might be
very interesting.

I don't have a site yet since so far I have little but a fuzzy picture
of what I want to do. I'm still trying to find out if it is actually
even doable. The hardware seems possible, even for $100 if I use a
slightly cheaper ADC than I'd like, but to then process this massive
amount of data I'm rather unsure about. I emailed the FFTW project,
since I figure they're the experts, but as of yet I've seen no reply.
Might be there's no one checking emails at weekends...

Anything with embedded mults and a clock rate 10 to 20 times higher
than your maximum bandwidth would probably be really good - at least
for fixed point processing (which I highly recommend).

Once I have gathered a little more real data and can come up with a
workable plan I'll probably set up a site of some sort. Maybe a simple

Sounds cool - keep me informed, please!

Thanks for the reply!



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