USRP2 FPGA: how to use custom_defs

Hi!

I’m planing on adding CUSTOM_DEFS to the USRP2 FPGA image, that I want
to extend with custom Verilog modules.
(http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/master/entry/fpga/README.txt)

I want to do this in a minimal invasive way, using some of the Simulink
Xilinx development stuff, that there is. Especially I want to keep the
DDC/DUC routines as they are for now, which are part of the DSP.

As far as I understand it a custom definition will completely substitute
any of the chain engines. Is there a way to be less destructive about
that?
Also I’m looking for what the current chains exactly are: is there some
sort of flow-graph here. Did somebody already analyse this?

There are some custom FPGA builds here and there. I’d be happy if
someone contributed insights how to touch this without having to redo
everything.

Best,
Marius

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