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cpu_test.vhd
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cpu_test.vhd
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-- Copyright 2018 Takayuki Nagata All Rights Reserved.
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
ENTITY cpu_test IS
END cpu_test;
ARCHITECTURE behavior OF cpu_test IS
COMPONENT cpu
PORT(
inM : IN std_logic_vector(15 downto 0);
instruction : IN std_logic_vector(15 downto 0);
reset : IN std_logic;
outM : OUT std_logic_vector(15 downto 0);
writeM : OUT std_logic;
addressM : OUT std_logic_vector(14 downto 0);
pc : OUT std_logic_vector(14 downto 0);
clk : IN std_logic
);
END COMPONENT;
signal inM : std_logic_vector(15 downto 0) := (others => '0');
signal instruction : std_logic_vector(15 downto 0) := (others => '0');
signal reset : std_logic := '0';
signal clk : std_logic := '0';
signal outM : std_logic_vector(15 downto 0);
signal writeM : std_logic;
signal addressM : std_logic_vector(14 downto 0);
signal pc : std_logic_vector(14 downto 0);
constant clk_period : time := 10 ns;
function buildCinst(
a: in std_logic;
c: in std_logic_vector (0 to 5);
d: in std_logic_vector (0 to 2);
j: in std_logic_vector (0 to 2))
return std_logic_vector is
variable inst: std_logic_vector (15 downto 0);
begin
inst(15 downto 13) := "111";
inst(12) := a;
inst(11 downto 6) := c;
inst(5 downto 3) := d;
inst(2 downto 0) := j;
return inst;
end function;
function LOAD_A(
val: in std_logic_vector (14 downto 0))
return std_logic_vector is
variable inst: std_logic_vector (15 downto 0);
begin
inst(15) := '0';
inst(14 downto 0) := val;
return inst;
end function;
function LOAD_D_A
return std_logic_vector is
variable inst: std_logic_vector (15 downto 0);
begin
inst := "1110110000010000";
return inst;
end function;
BEGIN
uut: cpu PORT MAP (
inM => inM,
instruction => instruction,
reset => reset,
outM => outM,
writeM => writeM,
addressM => addressM,
pc => pc,
clk => clk
);
clk_process :process
begin
clk <= '0';
wait for clk_period/2;
clk <= '1';
wait for clk_period/2;
end process;
stim_proc: process
variable inst_a : std_logic;
variable inst_c : std_logic_vector (0 to 5);
variable inst_d : std_logic_vector (0 to 2);
variable inst_j : std_logic_vector (0 to 2);
begin
reset <= '1';
wait for 100 ns;
reset <= '0';
wait for clk_period*10;
inM <= "1111111111111111";
-- Test A instruction
instruction <= LOAD_A("010010010010010");
wait for clk_period;
-- Test C instruction
-- Test dest
instruction <= LOAD_A("000000000000011");
wait for clk_period;
inst_a := '0';
inst_j := "000";
inst_c := "110000"; -- = A
-- null
inst_d := "000";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- M
inst_d := "001";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D
inst_d := "010";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- MD
inst_d := "011";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- A
inst_d := "100";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- AM
inst_d := "101";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- AD
inst_d := "110";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- AMD
inst_d := "111";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- Test jump
inst_a := '0';
inst_c := "001100"; -- = D
inst_d := "000"; -- null
-- No jump
inst_j := "000";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- If out > 0 jump
inst_j := "001";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- If out = 0 jump
inst_j := "010";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- If out >= 0 jump
inst_j := "011";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- If out < 0 jump
inst_j := "101";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- If out != 0 jump
inst_j := "110";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- Jump
inst_j := "111";
-- out = 0
instruction <= LOAD_A("000000000000000");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out > 0
instruction <= LOAD_A("000000000000001");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- out < 0
instruction <= LOAD_A("111111111111110");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("111000000000000");
wait for clk_period;
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- Test comp
instruction <= LOAD_A("000000000000011");
wait for clk_period;
instruction <= LOAD_D_A;
wait for clk_period;
instruction <= LOAD_A("000000000000001");
wait for clk_period;
-- a=0
inst_a := '0';
inst_d := "001"; -- Addre[M]
inst_j := "000";
-- 0
inst_c := "101010";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- 1
inst_c := "111111";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- -1
inst_c := "111010";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D
inst_c := "001100";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- A
inst_c := "110000";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- !D
inst_c := "001101";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- !A
inst_c := "110001";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- -D
inst_c := "001111";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- -A
inst_c := "110011";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D+1
inst_c := "011111";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- A+1
inst_c := "110111";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D-1
inst_c := "001110";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- A-1
inst_c := "110010";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D+A
inst_c := "000010";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D-A
inst_c := "010011";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- A-D
inst_c := "000111";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D&A
inst_c := "000000";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
-- D|A
inst_c := "010101";
instruction <= buildCinst(inst_a, inst_c, inst_d, inst_j);
wait for clk_period;
wait;
end process;
END;