adder_4.vhd

自已写的一个16X16的乘法器

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity adder_4 is  
  port(dataa : in std_logic_vector(19 downto 0);
       datab : in std_logic_vector(19 downto 0);
       sout : out std_logic_vector(23 downto 0));
end adder_4;

architecture arc of adder_4 is
begin
  sout <= ("0000" & dataa) + ( datab & "0000");
end arc;