Mux for INOUT ports

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And what problems are you having?

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Sorry, I forgot to write... Both ports appear to not send or receive any data if I use the mux.

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have you simulated the design? does it work? have you tried signaltap to investigate the situation and see if all control is as you expected?

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Yes, seems to be working on the simulation, but I didn't try the signaltap. I used only a few times some years ago, so I need to re-learn about it.