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hazard_unit.vhd
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library ieee;
use ieee.std_logic_1164.all;
entity hazard_unit is
port(ir1: in std_logic_vector(15 downto 0);
ir2: in std_logic_vector(15 downto 0);
ir3: in std_logic_vector(15 downto 0);
control_word1 : in std_logic_vector(50 downto 0);
modified_control_word : out std_logic_vector(50 downto 0));
end entity hazard_unit;
architecture Behavourial of hazard_unit is
begin
hazard_process: process(ir1,ir2,ir3, control_word1)
variable control_word : std_logic_vector(50 DOWNTO 0) := (others => '0');
begin
control_word := control_word1;
---add/n
if ir2(15 downto 12) = "0001" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir2(5 downto 3) = ir3(11 downto 9) then
control_word(38 downto 36) := "100";
elsif ir2(5 downto 3) = ir3(8 downto 6) then
control_word(35 downto 32) := "0010";
end if;
elsif ir2(15 downto 12) = "0001" and ir3(15 downto 12) = "0000" then
if ir2(5 downto 3) = ir3(11 downto 9) then
control_word(38 downto 36) := "100";
end if;
elsif ir2(15 downto 12) = "0001" and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir2(5 downto 3) = ir3(8 downto 6) then
control_word(43 downto 41) := "000" ;
end if;
elsif ir2(15 downto 12) = "0001" and ir3(15 downto 12) = "1111" then
if ir2(5 downto 3) = ir3(11 downto 9) then
control_word(43 downto 41) := "000" ;
end if;
elsif ir2(15 downto 12) = "0001" and ir3(15 downto 12) = "1101" then
if ir2(5 downto 3) = ir3(8 downto 6) then
control_word(21 downto 18) := "0111";
end if;
elsif ir2(15 downto 12) = "0000" and ir3(15 downto 12) = "0000" then
if ir2(8 downto 6) = ir3(8 downto 6) then
control_word(38 downto 36) := "100";
end if;
elsif ir2(15 downto 12) = "0000" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir2(8 downto 6) = ir3(11 downto 9) then
control_word(38 downto 36) := "100";
elsif ir2(8 downto 6) = ir3(8 downto 6) then
control_word(35 downto 32) := "0010";
end if;
elsif ir2(15 downto 12) = "0000" and ir3(15 downto 12) = "1101" then
if ir2(8 downto 6) = ir3(8 downto 6) then
control_word(21 downto 18) := "0111";
end if;
elsif ir2(15 downto 12) = "0000" and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir2(8 downto 6) = ir3(8 downto 6) then
control_word(43 downto 41) := "111";
end if;
elsif ir2(15 downto 12) = "0000" and ir3(15 downto 12) = "1111" then
if ir2(8 downto 6) = ir3(8 downto 6) then
control_word(43 downto 41) := "111" ;
end if;
-----LLI
elsif ir2(15 downto 12) = "0011" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "111";
end if;
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(35 downto 32) := "0111";
end if;
elsif ir2(15 downto 12) = "0011" and ir3(15 downto 12) = "0000" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "111";
end if;
elsif ir2(15 downto 12) = "0011" and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(43 downto 41) := "110";
end if;
elsif ir2(15 downto 12) = "0011" and ir3(15 downto 12) = "1101" then
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(21 downto 18) := "0110";
end if;
elsif ir2(15 downto 12) = "0011" and ir3(15 downto 12) = "1111" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(43 downto 41) := "110";
end if;
-----Jal
elsif (ir2(15 downto 12) = "1100" or ir2(15 downto 12) = "1101") and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "100";
end if;
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(35 downto 32) := "0010";
end if;
elsif (ir2(15 downto 12) = "1100" or ir2(15 downto 12) = "1101") and ir3(15 downto 12) = "0000" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "100";
end if;
elsif (ir2(15 downto 12) = "1100" or ir2(15 downto 12) = "1101") and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(43 downto 41) := "111";
end if;
elsif (ir2(15 downto 12) = "1100" or ir2(15 downto 12) = "1101") and ir3(15 downto 12) = "1101" then
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(21 downto 18) := "0111";
end if;
elsif (ir2(15 downto 12) = "1100" or ir2(15 downto 12) = "1101") and ir3(15 downto 12) = "1111" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(43 downto 41) := "111";
end if;
-------lw
elsif ir2(15 downto 12) = "0100" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "001";
control_word(2) := '0';
end if;
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(35 downto 32) := "1111";
control_word(2) := '0';
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "0000" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "001";
control_word(2) := '0';
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "0100" then
if ir1(11 downto 9) = ir2(8 downto 6) then
control_word(43 downto 41) := "000";
control_word(2) := '0';
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "0101" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(24 downto 23) := "11";
control_word(2) := '0';
end if;
if (ir2(11 downto 9) = ir3(8 downto 6) and ir1(11 downto 9) = ir3(11 downto 9)) then
control_word(24 downto 23) := "11";
control_word(43 downto 41) := "000";
control_word(2) := '0';
end if;
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(43 downto 41) := "000";
control_word(2) := '0';
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "1101" then
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(21 downto 18) := "1101";
control_word(2) := '0';
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "1111" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(43 downto 41) := "000";
control_word(2) := '0';
end if;
------Second Dependancies
---add/n
elsif ir1(15 downto 12) = "0001" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir1(5 downto 3) = ir3(11 downto 9) then
control_word(38 downto 36) := "010";
end if;
if ir1(5 downto 3) = ir3(8 downto 6) then
control_word(35 downto 32) := "0001";
end if;
elsif ir1(15 downto 12) = "0001" and ir3(15 downto 12) = "0000" then
if ir1(5 downto 3) = ir3(11 downto 9) then
control_word(38 downto 36) := "010";
end if;
elsif ir1(15 downto 12) = "0001" and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir1(5 downto 3) = ir3(8 downto 6) then
control_word(43 downto 41) := "100";
end if;
elsif ir1(15 downto 12) = "0001" and ir3(15 downto 12) = "1111" then
if ir1(5 downto 3) = ir3(11 downto 9) then
control_word(43 downto 41) := "100" ;
end if;
elsif ir1(15 downto 12) = "0001" and ir3(15 downto 12) = "1101" then
if ir1(5 downto 3) = ir3(8 downto 6) then
control_word(21 downto 18) := "0001";
end if;
--adi
elsif ir1(15 downto 12) = "0000" and ir3(15 downto 12) = "0000" then
if ir1(8 downto 6) = ir3(8 downto 6) then
control_word(38 downto 36) := "010";
end if;
elsif ir1(15 downto 12) = "0000" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir1(8 downto 6) = ir3(11 downto 9) then
control_word(38 downto 36) := "010";
end if;
if ir1(8 downto 6) = ir3(8 downto 6) then
control_word(35 downto 32) := "0001";
end if;
elsif ir1(15 downto 12) = "0000" and ir3(15 downto 12) = "1101" then
if ir1(8 downto 6) = ir3(8 downto 6) then
control_word(21 downto 18) := "0001";
end if;
elsif ir1(15 downto 12) = "0000" and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir1(8 downto 6) = ir3(8 downto 6) then
control_word(43 downto 41) := "100";
end if;
elsif ir1(15 downto 12) = "0000" and ir3(15 downto 12) = "1111" then
if ir1(8 downto 6) = ir3(8 downto 6) then
control_word(43 downto 41) := "100" ;
end if;
-----LLI
elsif ir1(15 downto 12) = "0011" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir1(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "011";
end if;
if ir1(11 downto 9) = ir3(8 downto 6) then
control_word(35 downto 32) := "1111";
end if;
elsif ir1(15 downto 12) = "0011" and ir3(15 downto 12) = "0000" then
if ir1(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "011";
end if;
elsif ir1(15 downto 12) = "0011" and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir1(11 downto 9) = ir3(8 downto 6) then
control_word(43 downto 41) := "101";
end if;
elsif ir1(15 downto 12) = "0011" and ir3(15 downto 12) = "1101" then
if ir1(11 downto 9) = ir3(8 downto 6) then
control_word(21 downto 18) := "1111";
end if;
elsif ir1(15 downto 12) = "0011" and ir3(15 downto 12) = "1111" then
if ir1(11 downto 9) = ir3(11 downto 9) then
control_word(43 downto 41) := "101";
end if;
-----Jal
elsif (ir1(15 downto 12) = "1100" or ir1(15 downto 12) = "1101") and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir1(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "010";
end if;
if ir1(11 downto 9) = ir3(8 downto 6) then
control_word(35 downto 32) := "0001";
end if;
elsif (ir1(15 downto 12) = "1100" or ir1(15 downto 12) = "1101") and ir3(15 downto 12) = "0000" then
if ir1(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "010";
end if;
elsif (ir1(15 downto 12) = "1100" or ir1(15 downto 12) = "1101") and (ir3(15 downto 12) = "0100" or ir3(15 downto 12) = "0101") then
if ir1(11 downto 9) = ir3(8 downto 6) then
control_word(43 downto 41) := "100";
end if;
elsif (ir1(15 downto 12) = "1100" or ir1(15 downto 12) = "1101") and ir3(15 downto 12) = "1101" then
if ir1(11 downto 9) = ir3(8 downto 6) then
control_word(21 downto 18) := "0001";
end if;
elsif (ir1(15 downto 12) = "1100" or ir1(15 downto 12) = "1101") and ir3(15 downto 12) = "1111" then
if ir1(11 downto 9) = ir3(11 downto 9) then
control_word(43 downto 41) := "100";
end if;
-------lw
elsif ir2(15 downto 12) = "0100" and (ir3(15 downto 12) = "0001" or ir3(15 downto 12) = "1000" or ir3(15 downto 12) = "1001" or ir3(15 downto 12) = "1010") then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "001";
end if;
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(35 downto 32) := "1111";----
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "0000" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(38 downto 36) := "001";
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "0100" then
if ir1(11 downto 9) = ir2(8 downto 6) then
control_word(43 downto 41) := "000";
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "0101" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(24 downto 23) := "11";
end if;
if (ir2(11 downto 9) = ir3(8 downto 6) and ir1(11 downto 9) = ir3(11 downto 9)) then
control_word(24 downto 23) := "11";
control_word(43 downto 41) := "000";
end if;
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(43 downto 41) := "000";
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "1101" then
if ir2(11 downto 9) = ir3(8 downto 6) then
control_word(21 downto 18) := "1101";
end if;
elsif ir2(15 downto 12) = "0100" and ir3(15 downto 12) = "1111" then
if ir2(11 downto 9) = ir3(11 downto 9) then
control_word(43 downto 41) := "000";
end if;
else control_word := control_word1;
end if;
modified_control_word <= control_word;
end process hazard_process;
end Behavourial;