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ControlUnit.vhd
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ControlUnit.vhd
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LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
ENTITY CONTROL_UNIT IS
PORT (
set_flush : IN STD_LOGIC;
op_code : IN STD_LOGIC_VECTOR(4 DOWNTO 0);
pc_write, inst_type, flush : OUT STD_LOGIC;
set_carry, branch, alu_src : OUT STD_LOGIC;
Rs_en, Rt_en, mem_read : OUT STD_LOGIC;
mem_write, interrupt_en : OUT STD_LOGIC;
stack, load, reg_write, in_en, out_en : OUT STD_LOGIC;
alu_op, flag_en, stack_op : OUT STD_LOGIC_VECTOR(2 DOWNTO 0)
);
END ENTITY;
ARCHITECTURE CONTROL_UNIT OF CONTROL_UNIT IS
BEGIN
PROCESS (set_flush, op_code) IS
BEGIN
IF set_flush = '1' THEN
flush <= '1';
END IF;
IF op_code = "00001" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
stack <= '0';
interrupt_en <= '0';
reg_write <= '0';
alu_op <= "000";
flag_en <= "000";
ELSIF op_code = "00010" THEN
pc_write <= '0';
inst_type <= '0';
flush <= '1';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
reg_write <= '0';
alu_op <= "000";
flag_en <= "000";
ELSIF op_code = "00011" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '1';
branch <= '0';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "000";
flag_en <= "001";
ELSIF op_code = "00100" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "001";
flag_en <= "110";
ELSIF op_code = "00101" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "010";
flag_en <= "111";
ELSIF op_code = "00110" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '1';
alu_op <= "011";
flag_en <= "000";
ELSIF op_code = "00111" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
load <= '0';
reg_write <= '1';
in_en <= '1';
out_en <= '0';
flag_en <= "000";
ELSIF op_code = "01000" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "000";
ELSIF op_code = "01001" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '0';
Rs_en <= '1';
Rt_en <= '1';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "100";
flag_en <= "111";
ELSIF op_code = "01010" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '0';
Rs_en <= '1';
Rt_en <= '1';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "101";
flag_en <= "111";
ELSIF op_code = "01011" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '0';
Rs_en <= '1';
Rt_en <= '1';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "110";
flag_en <= "110";
ELSIF op_code = "01100" THEN
pc_write <= '1';
inst_type <= '1';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "100";
flag_en <= "111";
ELSIF op_code = "10000" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '1';
interrupt_en <= '0';
stack <= '1';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "000";
stack_op <= "000";
ELSIF op_code = "10001" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '1';
mem_write <= '0';
interrupt_en <= '0';
stack <= '1';
load <= '1';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "000";
stack_op <= "001";
ELSIF op_code = "10010" THEN
pc_write <= '1';
inst_type <= '1';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '1';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "111";
flag_en <= "000";
ELSIF op_code = "10011" THEN
pc_write <= '1';
inst_type <= '1';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '1';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '1';
reg_write <= '1';
in_en <= '0';
out_en <= '0';
alu_op <= "100";
flag_en <= "000";
ELSIF op_code = "10100" THEN
pc_write <= '1';
inst_type <= '1';
flush <= '0';
set_carry <= '0';
branch <= '0';
Rs_en <= '1';
Rt_en <= '1';
mem_read <= '0';
mem_write <= '1';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "100";
flag_en <= "000";
alu_src <= '1';
ELSIF op_code = "11000" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
flag_en <= "100";
ELSIF op_code = "11001" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
flag_en <= "010";
ELSIF op_code = "11010" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
flag_en <= "001";
ELSIF op_code = "11011" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
flag_en <= "000";
ELSIF op_code = "11100" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '1';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '1';
interrupt_en <= '0';
stack <= '1';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "000";
stack_op <= "011";
ELSIF op_code = "11101" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '1';
mem_write <= '0';
interrupt_en <= '0';
stack <= '1';
load <= '1';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "000";
stack_op <= "010";
ELSIF op_code = "11110" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '1';
interrupt_en <= '1';
stack <= '1';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "000";
stack_op <= "101";
ELSIF op_code = "11111" THEN
pc_write <= '1';
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '1';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '1';
mem_write <= '0';
interrupt_en <= '0';
stack <= '1';
load <= '1';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "011";
flag_en <= "111";
stack_op <= "100";
ELSE
flag_en <= "000";
inst_type <= '0';
flush <= '0';
set_carry <= '0';
branch <= '0';
alu_src <= '0';
Rs_en <= '0';
Rt_en <= '0';
mem_read <= '0';
mem_write <= '0';
interrupt_en <= '0';
stack <= '0';
load <= '0';
reg_write <= '0';
in_en <= '0';
out_en <= '0';
alu_op <= "000";
END IF;
END PROCESS;
END CONTROL_UNIT;