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Hi vaka,
I believe instead of using AND gate, you can try to use a MUX at the top level. Then connect the output of the MUX to your Qsys exported TX parallel input ports. I am not sure if Qsys support the MUX library ie lpm_mux, you can try to did a quick search into the Qsys library and see.
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None of the lpm functions are available in qsys. And my qsys includes a pattern generator connected to timing adapter and then connected to the phy. same at the output to the pattern checker. So I can not find a way to manipulate the data from the patter generator before it goes to the phy, as there are no primitives or lpm functions in qsys.
Honored Contributor
