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library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.numeric_std.all;
use work.States.all;
entity cpu is
port(
reset : in STD_LOGIC;
sw0 : in STD_LOGIC;
start : in STD_LOGIC;
clk : in STD_LOGIC;
output1: out STd_logic_vector(6 downto 0);
output2: out STd_logic_vector(6 downto 0);
output3: out STd_logic_vector(6 downto 0);
output4: out STd_logic_vector(6 downto 0);
output5: out STd_logic_vector(6 downto 0);
output6: out STd_logic_vector(6 downto 0);
test0: out STd_logic;
test1: out STd_logic;
Z: out STd_logic
);
end cpu;
architecture behavioral of cpu is
function convSEG (N : std_logic_vector(3 downto 0) ) return std_logic_vector is
variable ans:std_logic_vector(6 downto 0);
begin
Case N is
when "0000" => ans:="1000000";
when "0001" => ans:="1111001";
when "0010" => ans:="0100100";
when "0011" => ans:="0110000";
when "0100" => ans:="0011001";
when "0101" => ans:="0010010";
when "0110" => ans:="0000010";
when "0111" => ans:="1111000";
when "1000" => ans:="0000000";
when "1001" => ans:="0010000";
when "1010" => ans:="0001000";
when "1011" => ans:="0000011";
when "1100" => ans:="1000110";
when "1101" => ans:="0100001";
when "1110" => ans:="0000110";
when "1111" => ans:="0001110";
when others=> ans:="1111111";
end case;
return ans;
end function convSEG;
type MEMtype is array (0 to 2**16-1) of std_logic_vector(7 downto 0);
constant ROM : MEMtype := (
"00001011",
"00000001",
"00000000",
"00100000",
"00000011",
"00000001",
"00000000",
"00100001",
"00001000",
"00000111",
"00000000",
"00010000",
"00001100",
"00000101",
"00000000",
"00010010",
"00001001",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000000",
"00000101",
"00001010",
others => "00000000" );
signal P_S : myState;
signal N_S : myState;
signal AR_REGISTER :STd_logic_vector(15 downto 0);
signal AC_REGISTER :STd_logic_vector(7 downto 0);
signal IR_REGISTER :STd_logic_vector(7 downto 0);
signal PC_REGISTER :STd_logic_vector(15 downto 0);
signal R_REGISTER :STd_logic_vector(7 downto 0);
signal TR_REGISTER :STd_logic_vector(7 downto 0);
signal Z_FLAG :STd_logic;
signal DR_REGISTER :STd_logic_vector(7 downto 0);
signal RAM :MEMtype;
signal Delay_count : integer := 0;
signal en : STd_logic := '0';
signal temp : STd_logic_vector(1 downto 0);
signal Mem_count : integer := 0;
begin
--FSM structure process
process(clk , reset)
begin
if (reset = '0') then
P_S <= RESET1;
elsif (rising_edge(clk)) then
P_S <= N_S;
end if;
end process;
--FSM transport process
process(P_S , IR_REGISTER, Z_FLAG, start, en, Mem_count)
begin
N_S <= P_S;
case P_S is
when RESET1 =>
N_S <= MEM_INIT;
temp <= "00";
when MEM_INIT =>
if (Mem_count = 2**16-1) then
N_S <= FINISH;
end if;
temp <= "01";
when FINISH =>
if (start = '0') then
N_S <= FETCH1;
end if;
temp <= "10";
when FETCH1 =>
if( en = '1' )then
N_S <= FETCH2;
end if;
temp <= "11";
when FETCH2 =>
if( en = '1' )then
N_S <= FETCH3;
end if;
temp <= "00";
when FETCH3 =>
if( en = '1' )then
if (IR_REGISTER="00000000") then
N_S <= NOP1;
elsif (IR_REGISTER="00000001") then
N_S <= LDAC1;
elsif (IR_REGISTER="00000010") then
N_S <= STAC1;
elsif (IR_REGISTER="00000011") then
N_S <= MVAC1;
elsif (IR_REGISTER="00000100") then
N_S <= MOVR1;
elsif (IR_REGISTER="00000101") then
N_S <= JUMP1;
elsif (IR_REGISTER="00000110" AND Z_FLAG='1') then
N_S <= JMPZY1;
elsif (IR_REGISTER="00000110" AND Z_FLAG='0') then
N_S <= JMPZN1;
elsif (IR_REGISTER="00000111" AND Z_FLAG='0') then
N_S <= JPNZY1;
elsif (IR_REGISTER="00000111" AND Z_FLAG='1') then
N_S <= JPNZN1;
elsif (IR_REGISTER="00001000") then
N_S <= ADD1;
elsif (IR_REGISTER="00001001") then
N_S <= SUB1;
elsif (IR_REGISTER="00001010") then
N_S <= INAC1;
elsif (IR_REGISTER="00001011") then
N_S <= CLAC1;
elsif (IR_REGISTER="00001100") then
N_S <= AND1;
elsif (IR_REGISTER="00001101") then
N_S <= OR1;
elsif (IR_REGISTER="00001110") then
N_S <= XOR1;
elsif (IR_REGISTER="00001111") then
N_S <= NOT1;
end if;
end if;
when NOP1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when LDAC1 =>
if( en = '1' )then
N_S <= LDAC2;
end if;
when LDAC2 =>
if( en = '1' )then
N_S <= LDAC3;
end if;
when LDAC3 =>
if( en = '1' )then
N_S <= LDAC4;
end if;
when LDAC4 =>
if( en = '1' )then
N_S <= LDAC5;
end if;
when LDAC5 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when STAC1 =>
if( en = '1' )then
N_S <= STAC2;
end if;
when STAC2 =>
if( en = '1' )then
N_S <= STAC3;
end if;
when STAC3 =>
if( en = '1' )then
N_S <= STAC4;
end if;
when STAC4 =>
if( en = '1' )then
N_S <= STAC5;
end if;
when STAC5 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when MVAC1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when MOVR1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when JUMP1 =>
if( en = '1' )then
N_S <= JUMP2;
end if;
when JUMP2 =>
if( en = '1' )then
N_S <= JUMP3;
end if;
when JUMP3 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when JMPZY1 =>
if( en = '1' )then
N_S <= JMPZY2;
end if;
when JMPZY2 =>
if( en = '1' )then
N_S <= JMPZY3;
end if;
when JMPZY3 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when JMPZN1 =>
if( en = '1' )then
N_S <= JMPZN2;
end if;
when JMPZN2 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when JPNZY1 =>
if( en = '1' )then
N_S <= JPNZY2;
end if;
when JPNZY2 =>
if( en = '1' )then
N_S <= JPNZY3;
end if;
when JPNZY3 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when JPNZN1 =>
if( en = '1' )then
N_S <= JPNZN2;
end if;
when JPNZN2 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when ADD1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when SUB1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when INAC1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when CLAC1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when AND1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when OR1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when XOR1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
when NOT1 =>
if( en = '1' )then
N_S <= FETCH1;
end if;
end case;
end process;
--manage AC_REGISTER
process(clk, reset)
begin
if(reset = '0')then
AC_REGISTER <= (others => '0');
elsif (falling_edge(clk) and en = '1')then
AC_REGISTER <= AC_REGISTER ;
case P_S is
when MEM_INIT =>
AC_REGISTER(7 downto 4) <= "0011";
AC_REGISTER(3 downto 0) <= "0011";
when LDAC5 =>
AC_REGISTER <= DR_REGISTER ;
when MOVR1 =>
AC_REGISTER <= R_REGISTER ;
when ADD1 =>
AC_REGISTER <= std_logic_vector(unsigned(AC_REGISTER) + unsigned(R_REGISTER));
when SUB1 =>
AC_REGISTER <= std_logic_vector(unsigned(AC_REGISTER) - unsigned(R_REGISTER));
when INAC1 =>
AC_REGISTER <= std_logic_vector(unsigned(AC_REGISTER) + 1);
when CLAC1 =>
AC_REGISTER <= (others => '0');
when AND1 =>
AC_REGISTER <= AC_REGISTER AND R_REGISTER ;
when OR1 =>
AC_REGISTER <= AC_REGISTER OR R_REGISTER ;
when XOR1 =>
AC_REGISTER <= AC_REGISTER XOR R_REGISTER ;
when NOT1 =>
AC_REGISTER <= NOT AC_REGISTER ;
when others =>
end case;
end if;
end process;
--manage PC_REGISTER
process(clk, reset)
begin
if(reset = '0')then
PC_REGISTER <= (others => '0');
elsif (falling_edge(clk) and en = '1')then
PC_REGISTER <= PC_REGISTER ;
case P_S is
when FETCH2 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when LDAC1 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when LDAC2 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when STAC1 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when STAC2 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when JUMP3 =>
PC_REGISTER(15 downto 8) <= TR_REGISTER;
PC_REGISTER(7 downto 0) <= DR_REGISTER;
when JMPZY3 =>
PC_REGISTER(15 downto 8) <= TR_REGISTER;
PC_REGISTER(7 downto 0) <= DR_REGISTER;
when JMPZN1 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when JMPZN2 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when JPNZY3 =>
PC_REGISTER(15 downto 8) <= TR_REGISTER;
PC_REGISTER(7 downto 0) <= DR_REGISTER;
when JPNZN1 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when JPNZN2 =>
PC_REGISTER <= std_logic_vector(unsigned(PC_REGISTER) +1);
when others =>
end case;
end if;
end process;
--manage AR_REGISTER
process(clk, reset)
begin
if(reset = '0')then
AR_REGISTER <= (others => '0');
elsif (falling_edge(clk) and en = '1')then
AR_REGISTER <= AR_REGISTER ;
case P_S is
when FETCH1 =>
AR_REGISTER <= PC_REGISTER ;
when FETCH3 =>
AR_REGISTER <= PC_REGISTER ;
when LDAC1 =>
AR_REGISTER <= std_logic_vector(unsigned(AR_REGISTER) +1);
when LDAC3 =>
AR_REGISTER(15 downto 8) <= TR_REGISTER;
AR_REGISTER(7 downto 0) <= DR_REGISTER;
when STAC1 =>
AR_REGISTER <= std_logic_vector(unsigned(AR_REGISTER) +1);
when STAC3 =>
AR_REGISTER(15 downto 8) <= TR_REGISTER;
AR_REGISTER(7 downto 0) <= DR_REGISTER;
when JUMP1 =>
AR_REGISTER <= std_logic_vector(unsigned(AR_REGISTER) +1);
when JMPZY1 =>
AR_REGISTER <= std_logic_vector(unsigned(AR_REGISTER) +1);
when JPNZY1 =>
AR_REGISTER <= std_logic_vector(unsigned(AR_REGISTER) +1);
when others =>
end case;
end if;
end process;
--manage DR_REGISTER
process(clk, reset)
begin
if(reset = '0')then
DR_REGISTER <= (others => '0');
elsif (falling_edge(clk))then
DR_REGISTER <= DR_REGISTER ;
case P_S is
when FETCH2 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when LDAC1 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when LDAC2 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when LDAC4 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when STAC1 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when STAC2 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when STAC4 =>
DR_REGISTER <= AC_REGISTER ;
when JUMP1 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when JUMP2 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when JMPZY1 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when JMPZY2 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when JPNZY1 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when JPNZY2 =>
DR_REGISTER <= RAM(to_integer(unsigned(AR_REGISTER)));
when others =>
end case;
end if;
end process;
--manage TR_REGISTER
process(clk, reset)
begin
if(reset = '0')then
TR_REGISTER <= (others => '0');
elsif (falling_edge(clk))then
TR_REGISTER <= TR_REGISTER ;
case P_S is
when LDAC2 =>
TR_REGISTER <= DR_REGISTER ;
when STAC2 =>
TR_REGISTER <= DR_REGISTER ;
when JUMP2 =>
TR_REGISTER <= DR_REGISTER ;
when JMPZY2 =>
TR_REGISTER <= DR_REGISTER ;
when JPNZY2 =>
TR_REGISTER <= DR_REGISTER ;
when others =>
end case;
end if;
end process;
--manage IR_REGISTER
process(clk, reset)
begin
if(reset = '0')then
IR_REGISTER <= (others => '0');
elsif (falling_edge(clk))then
IR_REGISTER <= IR_REGISTER ;
case P_S is
when FETCH3 =>
IR_REGISTER <= DR_REGISTER ;
when others =>
end case;
end if;
end process;
--manage R_REGISTER
process(clk, reset)
begin
if(reset = '0')then
R_REGISTER <= (others => '0');
elsif (falling_edge(clk))then
R_REGISTER <= R_REGISTER ;
case P_S is
when MEM_INIT =>
R_REGISTER(7 downto 4) <= "0000";
R_REGISTER(3 downto 0) <= "0010";
when MVAC1 =>
R_REGISTER <= AC_REGISTER ;
when others =>
end case;
end if;
end process;
--manage Z_FLAG
process(clk, reset)
begin
if(reset = '0')then
Z_FLAG <= '0';
elsif (rising_edge(clk))then
if (AC_REGISTER = "00000000" ) then
Z_FLAG <= '1';
else
Z_FLAG <= '0';
end if;
end if;
end process;
--manage memory
process(clk)
begin
if (falling_edge(clk))then
case P_S is
when MEM_INIT =>
RAM(Mem_count) <= ROM(Mem_count);
Mem_count <= Mem_count + 1;
when STAC5 =>
RAM(to_integer(unsigned(AR_REGISTER))) <= DR_REGISTER ;
when others =>
end case;
end if;
end process;
--Send value of register to output
process(clk)
variable tmp: STd_logic_vector(7 downto 0);
begin
tmp := RAM(to_integer(unsigned(AR_REGISTER)));
if(sw0 = '0')then
output1 <= convSEG(AC_REGISTER(3 downto 0));
output2 <= convSEG(AC_REGISTER(7 downto 4));
output3 <= convSEG(R_REGISTER(3 downto 0));
output4 <= convSEG(R_REGISTER(7 downto 4));
output5 <= convSEG(tmp(3 downto 0));
output6 <= convSEG(tmp(7 downto 4));
else
output1 <= convSEG(DR_REGISTER(3 downto 0));
output2 <= convSEG(DR_REGISTER(7 downto 4));
output3 <= convSEG(AR_REGISTER(3 downto 0));
output4 <= convSEG(AR_REGISTER(7 downto 4));
output5 <= convSEG(PC_REGISTER(3 downto 0));
output6 <= convSEG(PC_REGISTER(7 downto 4));
end if;
end process;
process(clk)
begin
if (falling_edge(clk))then
if(Delay_count = 100000000)then
en <= '1';
Delay_count <= 0;
else
en <= '0';
Delay_count <= Delay_count + 1;
end if;
end if;
end process;
test0 <= temp(0);
test1 <= temp(1);
Z <= Z_FLAG;
end behavioral;

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