addresunit.vhd

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

ENTITY AddressUnit IS
PORT (
 Rside : IN std_logic_vector (15 DOWNTO 0);
 Iside : IN std_logic_vector (7 DOWNTO 0);
 Address : OUT std_logic_vector (15 DOWNTO 0);
clk, ResetPC, PCplusI, PCplus1 : IN std_logic;
RplusI, Rplus0, EnablePC : IN std_logic
);
END AddressUnit;

 ARCHITECTURE dataflow OF AddressUnit IS
   --pc component
 COMPONENT ProgramCounter IS
 PORT (
 EnablePC : IN std_logic;
 input: IN std_logic_vector (15 DOWNTO 0);
 clk : IN std_logic;
 output: OUT std_logic_vector (15 DOWNTO 0)
 );END COMPONENT;
 --address logic component
 COMPONENT  AddressLogic IS
    PORT (
        PCside, Rside : IN std_logic_vector (15 DOWNTO 0);
        Iside : IN std_logic_vector (7 DOWNTO 0);--come from IR
        ALout : OUT std_logic_vector (15 DOWNTO 0);
        ResetPC, PCplusI, PCplus1, RplusI, Rplus0 : IN std_logic
    );
  END COMPONENT;

 SIGNAL pcout : std_logic_vector (15 DOWNTO 0);
 SIGNAL AddressSignal : std_logic_vector (15 DOWNTO 0);
 BEGIN
 Address <= AddressSignal;
 l1 : ProgramCounter PORT MAP (EnablePC, AddressSignal, clk, pcout);
 l2 : AddressLogic PORT MAP(pcout, Rside, Iside, AddressSignal,
 ResetPC, PCplusI, PCplus1, RplusI, Rplus0);
 END dataflow;