Ok, my code is below.It's a program that converts a number in bcd code to binary code when "c" is 0 and converts from binary to bcd when "c" is 1.The problem is at the exponentiation of the first loop(ebd).
Library ieee;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.all;
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Entity conv_bcd_bin_bcd is
Generic(nbitsin:natural:=8;
nbitsout:natural:=12);
Port(X:in unsigned(nbitsin downto 1);
c:in std_logic;
Y:out unsigned(nbitsout downto 1));
end entity conv_bcd_bin_bcd;
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Architecture struc of conv_bcd_bin_bcd is
Begin
abc:Process(c,X)
variable aux,cont:integer;
Begin
aux:=0;
cont:=0;
if c='0' then
ebd:for i in 1 to (nbitsin/4) loop
aux:=aux + (to_integer(X(4*i downto 4*i-3))*10**(cont));
if(to_integer(X(4*i downto 4*i-3))<10) then
cont:=cont+1;
else
cont:=cont+2;
end if;
end loop ebd;
Y<=to_unsigned(aux,nbitsout);
else
aux:=to_integer(X);
rdf:for i in 1 to (nbitsout/4) loop
Y(4*i downto 4*i-3)<=to_unsigned((aux mod 10),4);
aux:=aux/10;
end loop rdf;
end if;
end process abc;
end architecture struc;
Thanks.
