[HaBo]

Hier mal der wesentliche Code:

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

entity calculator_core is port(
 inc, sel, rst : in std_logic;
 stageOut : out std_logic_vector(2 downto 0);
 outputVal : out std_logic_vector(7 downto 0));
end calculator_core

architecture behavioral of calculator_core is
 signal aS : std_logic_vector(7 downto 0);
 signal bS : std_logic_vector(7 downto 0);
 signal opS : std_logic_vector(7 downto 0);
 signal resS : std_logic_vector(7 downto 0);
 signal stateS : std_logic_vector(2 downto 0);


begin

...
...

selProc:process(sel,rst)
 variable aV : std_logic_vector(7 downto 0):= "00000000";
 variable bV : std_logic_vector(7 downto 0):= "00000000";
begin
 if state = "100" then
   if inc'event and inc = '0' then
     case op(2 downto 0) is
     when "001" => res := a + b;
     when "010" => res := a - b;
     when "100" => res := (aV(7 downto 0) and bV(7 downto 0));
     when others => res :=0;
    end case;
   end if;
  end if;
end process;
end behavioral;