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Message: [QUOTE="Peter, post: 4187043"] But it seems as constants in a package are allowed in a case-choice, as long as I dont use the "to_unsigned" function? Constant MASKREG : unsigned(5 downto 0):= "000000"; -- Gives no warning Constant MASKREG : unsigned(5 downto 0):= To_unsigned(0,6); -- Does The package is compiled first. Why is the compiler unable to know the value of the constant just because it was set by a function? And I tried to move the declaration into the architecture where it is used. It gives the same warning. Thanks gentlemen for Your interest, Peter [/QUOTE]