Subversion Repositories special_functions_unit

-- f_log2 calcula el logaritmo natural de dos de un numero,

-- retorna entero: f_log2(23) = 5, f_log2(16) = 4, f_log2(17)=5 

library ieee;

use ieee.std_logic_1164.all;

package log2_pkg is

        function f_log2 (x : positive) return natural;

end package;

package body log2_pkg is

        function f_log2 (x : positive) return natural is

                variable i : natural:=0;

        begin

                i := 0;

                while (2**i < x) and i < 31 loop

                                i := i + 1;

                end loop;

                return i;

        end function;

end package body;