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Using the "normal" way, it can be a lot of work to do it if the signals are several levels down.
This is often cumbersome if port changes need to be made like you mentioned.. just curious does anyone know of an editor or IDE that auto-updates port maps and port declarations to make things easier?
I don't recommend it, but I think the VHDL language allows you to do it with signals declared in a package.
I have not tested it, and I will not be surprised if some tools refuse to accept it, even if it is legal VHDL.
It should not be used in a design, but it could be a convenient way to temporarily route internal signals to pins for debugging/testing.
Using the "normal" way, it can be a lot of work to do it if the signals are several levels down.