It is possible to create an ALU that add, subtracts and multiplies all in one? I cannot seem to get the multiplication to work because I need double the storage because the numbers are being multiplied. Do I just need to use different storage variables? Is there a "cleaner" way?
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
ENTITY ALU IS
port(x, y : in std_logic_vector(7 downto 0); --variables on which opeation is performed
operation : in std_logic_vector(2 downto 0); --how to choose what operation
zero : out std_logic;
result : out std_logic_vector(7 downto 0));
END ALU;
architecture ALU_ARCH of ALU is
begin
process(operation)
variable temp: std_logic_vector(7 downto 0);
begin
case operation is
when "101" =>
temp := x + y;
when "110" =>
temp := x - y;
when "111" =>
temp:=x*y;
when others =>
temp := x - y;
end case;
result <= temp;
end process;
end ALU_ARCH;
