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Message: [QUOTE="Olaf, post: 2886446"] Hi, after some hours I found an error in my testbench, since I forgot the bondaries of use (I wrote it some time ago). Here the origin function: function str2sulv(vec : in string) return std_ulogic_vector is variable temp : std_ulogic_vector(vec'range) := (others => 'X'); begin for i in vec'range loop if (vec(i) = '1') then temp(i) := '1'; elsif (vec(i) = '0') then temp(i) := '0'; end if; end loop; return temp; end function; I called this with vec = "1111111_000000" - the underline was the problem. No I would like to write it using an argument more: the range to avoid such problem for the future. How can I add it? function str2sulv( vec : in string; rg : in ???????) return std_ulogic_vector is variable temp : std_ulogic_vector(rg) := (others => 'X'); which I want to call like: data <= str2sulv("1111111_0000000", data'range); Thanks Olaf [/QUOTE]