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Date: Mon, 7 Nov 2011 14:00:48 -0700
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Subject: Re: [geda-user] PCIe card?
From: Russell Dill <Russ DOT Dill AT asu DOT edu>
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On Mon, Nov 7, 2011 at 12:04 PM, Peter Clifton <pcjc2 AT cam DOT ac DOT uk> wrote:
> Has anyone here designed a PCI Express card (Using gEDA / PCB or
> otherwise?)
>
> I see there are various options, such as FPGA with internal PHY /
> SerDes, FPGA + external PHY / SerDes, PCIe <-> local bus bridge (e.g.
> PLX's PEX 8311 chip).
>
> I'm mainly curious as to what others have tried, and how tricky the
> process was. I'm looking at doing one, and am starting to think I might
> need to code support for differential traces in PCB ;).
>

I'm working on a Virtex-6 design. They have integrated PCIe support
and very detailed recommendations for PCB layout. My current planned
stackup is

signal
ground
power
<core>
power/signal
ground
signal

I'm fully willing and able to share designs and details.