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The 'center < to_unsigned()' itself returns a boolean which doesn't comply with your specified unsigned return type.
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Thanks a lot for the pointer - indeed after writing a conversion-function everything works as expected. I wasn't aware that the return-type is also involved when looking up a function candidate.
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The function specification always specifies an unconstrained returned object, but it is up to you to return a properly constrained object at the exit of the function.
You may want to get hold of a good introductory book to VHDL like e.g. "Circuit Design with VHDL" by Volnei A. Podroni.
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I definitively will. However, I am a practitioner when it comes to learning - so I have to start writing code ;)
Thanks a lot, Reggi
Honored Contributor
