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Nic400: Create Simple mux instead of arbiter between multiple Initiators.

I have a design with multiple communication interfaces connected to nic400 via either AXI4 or AHBLite and accessing the same set of targets.

Only one interface is guaranteed to be operational on PCB(shared IO pins)

How do I use this knowledge to ensure that Instead of implementing an arbiter between the 3 Initiators and their corresponding targets, NIC400 implements a simple mux with the mux select controlled via the toplevel IO  mux select pins