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I would try first to connect the custom hardware to the SOPC inside one FPGA for example over an AVALON MM interface.
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That's exactly what i'm trying to do. The connection with the other FPGA is not a problem.
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For simulation your custom hardware together with the SOPC you can expand the testbench which is generated during SOPC building. I case you are using VHDL the file <your_toplevel_name>_sopc.vhd contains a section:
-- <ALTERA_NOTE> CODE INSERTED BETWEEN HERE
--add your libraries here
-- AND HERE WILL BE PRESERVED </ALTERA_NOTE>
entity test_bench is
end entity test_bench;
...
Here you can instantiate your components. Additional you have to compile your sources in modelsim.
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I will try this option :) and let you know..
Sorry but i didn't understand this:
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In Altera Version 7.2 I changed the setup_sim.do script in the <your_toplevel_name>_sopc_sim subdirectory.
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