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DATA_Controller.vhd
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----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 22:48:56 03/31/2016
-- Design Name:
-- Module Name: DATA_COntroller - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use ieee.numeric_std.all;
use std.textio.all;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity DATA_Controller is
port(CLK : in STD_LOGIC;
control_data_hazard : out STD_LOGIC;
Control_RB_mux : out STD_LOGIC_VECTOR(3 DOWNTO 0);
READ_SIGNAL : OUT STD_LOGIC;
READ_SIGNAL_FOR_SHADOW_REGISTER:OUT STD_LOGIC;
OPCODE : in STD_LOGIC_vector(3 downto 0);
ID: IN STD_LOGIC_VECTOR(1 DOWNTO 0)
);
end DATA_Controller;
architecture Behavioral of DATA_Controller is
begin
process(CLK)
begin
if RISING_EDGE(CLK) then
--LOAD--------------------------------------------------------------------------------------------------------------------------------------------------------
if(OPCODE="1001") then
control_data_hazard<='1'; --HAZARD WITH LOAD
control_RB_mux<="0011";
--STORE---------------------------------------------------------------------------------------------------------------------------------------------------------
elsif (OPCODE="1010") then
control_data_hazard<='0';-- NO HAZARD WITH STORE
control_RB_mux<="0011";
--ADDI,ANDI,SL,SR----------------------------------------------------------------------------------------------------------------------------------------
elsif(OPCODE="0101") or (OPCODE="0110") or (OPCODE="0111") or (OPCODE="1000") then
control_RB_mux<="0001";
--BRANCH--------------------------------------------------------------------------------------------------------------------------------------------------
ELSIF(OPCODE="1111") THEN
CONTROL_RB_MUX<="0010";
--LOAD SPECIAL INSTRUCTIONS--------------------------------------------------------------------------------------------------------------------
ELSIF (OPCODE="1011") THEN
IF (ID="00") THEN --LWV (LOAD WORD VECTOR TO REG_BANK)
CONTROL_RB_MUX<="0100";
ELSIF(ID="01") THEN --LWVD (LOAD WORD VECTOR TO DATA_MEMORY)
CONTROL_RB_MUX<="0101";
ELSIF(ID="10") THEN -- LWVI (LOAD WORD VECTOR TO INSTRUCTION_MEMORY)
CONTROL_RB_MUX<="0110";
ELSE --LWVS LOAD WORD VECTOR TO SHADOW_REGISTER
CONTROL_RB_MUX<="0111";
END IF;
--STORE SPECIAL INSTRUCTIONS--------------------------------------------------------------------------------------------------------------------
ELSIF ( OPCODE="1100") THEN
IF (ID="00") THEN --SWISTORE WORD VECTOR TO EXTERNAL_MEMORY FROM REG_BANK
CONTROL_RB_MUX<="1000";
ELSIF(ID="01") THEN --SWED(STORE WORD VECTOR TO EXTERNAL_MEMORY FROM DATA_MEMORY)
CONTROL_RB_MUX<="1001";
ELSIF(ID="10") THEN --SWEI (STORE WORD VECTOR TO EXTERNAL_MEMORY FROM INSTRUCTION_MEMORY)
CONTROL_RB_MUX<="1010";
ELSE -- THIS IS INTERRUPT,
CONTROL_RB_MUX<="1100";
END IF;
-------------REST----------------------------------------------------------------------------------------------------------------
else
control_RB_mux<="0000";
end if;
end if;
END PROCESS;
READ_SIGNAL<='1';
end Behavioral;