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----------------------------------------------------------------------------------
-- Company: ICT
-- Engineer: Daniel Fabian & Ulrich Paleček
--
-- Create Date: 04/11/2026 03:42:35 PM
-- Design Name: Snake
-- Module Name: Head_tb - Behavioral
-- Project Name: Snake
-- Target Devices: Nexys 4 DDR & Nexys A7 100T
-- Tool Versions: Vivado 2020+
-- Description: Testbench for module head
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Revision 1.0 - First working version
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.all;
use work.local_types.all;
entity Head_tb is
-- Port ( );
end Head_tb;
architecture Testbench of Head_tb is
constant CLK_PERIOD : time := 10 ns;
signal clk_sig : std_logic := '0';
signal run_head_sig : std_logic := '0';
signal head_done_sig : std_logic := '0';
signal head_death_sig : std_logic := '0';
signal logic_reset_sig : std_logic := '0';
signal tile_coord_head_sig : coordinate_t;
signal tile_from_GA_sig : game_tile;
signal tile_to_GA_sig : game_tile;
signal set_tile_sig : std_ulogic;
signal head_pos_out_sig : coordinate_t;
signal direction_sig : direction_t;
signal trigger_head : std_logic := '0';
signal last_tile_coord_head_sig : coordinate_t;
signal last_head_done_sig : std_logic := '0';
signal last_head_death_sig : std_logic := '0';
signal last_tile_to_GA_sig : game_tile;
signal last_set_tile_sig : std_ulogic;
signal empty_tile : game_tile;
signal head_tile : game_tile;
signal body_tile : game_tile;
signal tail_tile : game_tile;
signal apple_tile : game_tile;
begin
empty_tile.is_tail <= '0';
empty_tile.is_head <= '0';
empty_tile.is_apple <= '0';
empty_tile.is_body <= '0';
empty_tile.parent.y <= "000000";
empty_tile.parent.x <= "000000";
head_tile.is_head <= '1';
head_tile.is_tail <= '0';
head_tile.is_apple <= '0';
head_tile.is_body <= '0';
head_tile.parent.y <= "000000";
head_tile.parent.x <= "000000";
body_tile.is_head <= '0';
body_tile.is_tail <= '0';
body_tile.is_apple <= '0';
body_tile.is_body <= '1';
tail_tile.is_tail <= '1';
tail_tile.is_head <= '0';
tail_tile.is_apple <= '0';
tail_tile.is_body <= '0';
tail_tile.parent.y <= "000000";
tail_tile.parent.x <= "000000";
apple_tile.is_apple <= '1';
apple_tile.is_tail <= '0';
apple_tile.is_head <= '0';
apple_tile.is_body <= '0';
apple_tile.parent.y <= "000000";
apple_tile.parent.x <= "000000";
Head_inst : entity work.Head
generic map(
AREAHEIGHT => 48,
AREAWIDTH => 64
)
port map(
clk => clk_sig, --: in std_ulogic;
run_head => run_head_sig, --: in std_ulogic;
head_done => head_done_sig, --: out std_ulogic;
head_death => head_death_sig,
reset => logic_reset_sig,
--gamearea manipulation/information interface
tile_coord => tile_coord_head_sig, --: out coordinate;
tile_from_GA => tile_from_GA_sig, --: in game_tile;
tile_to_GA => tile_to_GA_sig, --: out game_tile;
--get_tile => get_tile_sig, --: out std_ulogic;
set_tile => set_tile_sig, --: out std_ulogic;
--gamesstate information
head_pos => head_pos_out_sig, --: in coordinate;
--button direction
direction => direction_sig--, --: in buttondir--;
-- debug_last_dir => debug_last_dir_sig
);
clk_gen : process
begin
clk_sig <= '1';
wait for CLK_PERIOD / 2;
clk_sig <= '0';
wait for CLK_PERIOD / 2;
end process;
-- 0. In a the beninging >> IDLE
-- 1. Calculate next head postition >> CALC_NEXT_HEAD_POS
-- 2. Check next head position (wall) | request tile next head position >> CHECK_NEXT_HEAD_POS
-- 3. wait >> CYCLE_WASTE
-- 4. wait >> WASTE_CYCLE
-- 5. Check death at next head position >> CHECK_DEATH
-- 6. Write Next Head Position >> SET_NEXT_HEAD
-- 7. Write Last Head Position as body >> SET_BODY
-- 8. Set Done sig >> DONE
-- Ferner liefen: >> DEATH
kickoff_head : process (head_done_sig, head_death_sig, trigger_head)
begin
if run_head_sig = '0' and trigger_head = '1' then
run_head_sig <= '1';
elsif run_head_sig = '1' and head_death_sig = '1' then
run_head_sig <= '0';
elsif run_head_sig = '1' and head_done_sig = '1' then
run_head_sig <= '0';
else
run_head_sig <= run_head_sig;
end if;
end process;
-- -- Stimulus Prozess
stimulus : process
begin
-- Reset Phase
wait for 0 ns;
logic_reset_sig <= '1';
tile_from_GA_sig <= empty_tile;
wait for CLK_PERIOD * 5;
logic_reset_sig <= '0';
-- Should still be in reset state
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" and set_tile_sig = '0' and tile_to_GA_sig = empty_tile and head_done_sig = '0' and head_death_sig = '0' report "Reset not in Reset State" severity error;
wait for CLK_PERIOD * 5;
-- should be in IDLE state
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" and set_tile_sig = '0' and tile_to_GA_sig = empty_tile and head_done_sig = '0' and head_death_sig = '0' report "Not in IDLE state" severity error;
wait for CLK_PERIOD * 5;
-- Test valid RIGHT
report "Test: Valid RIGHT";
body_tile.parent.x <= "001101";
body_tile.parent.y <= "010101";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= body_tile;
direction_sig <= RIGHT;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test valid RIGHT eating apple
report "Test: Valid RIGHT eating apple";
body_tile.parent.x <= "001101";
body_tile.parent.y <= "010101";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= body_tile;
direction_sig <= RIGHT;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= apple_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test invalid LEFT after RIGHT
report "Test: invalid LEFT after RIGHT";
body_tile.parent.x <= "001101";
body_tile.parent.y <= "010101";
wait for 0ns;
trigger_head <= '1';
tile_from_GA_sig <= body_tile;
direction_sig <= LEFT;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = "001101" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test valid DOWN
report "Test: Valid DOWN";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010110";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= body_tile;
direction_sig <= DOWN;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test invalid UP after DOWN
report "Test: invalid UP after DOWN";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010110";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= body_tile;
direction_sig <= UP;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test valid LEFT
report "Test: Valid LEFT";
body_tile.parent.x <= "001011";
body_tile.parent.y <= "010101";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= body_tile;
direction_sig <= LEFT;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test invalid RIGHT after LEFT
report "Test: invalid RIGHT after LEFT";
body_tile.parent.x <= "001011";
body_tile.parent.y <= "010101";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= RIGHT;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test valid UP
report "Test: Valid UP";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= UP;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test invalid DOWN (after UP)
report "Test: invalid DOWN after UP";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= DOWN;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= empty_tile;
wait until set_tile_sig = '1' for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait until tile_to_GA_sig = body_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = body_tile then
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timeout - not setting body_tile after head_tile has been set" severity failure;
end if;
else
assert tile_coord_head_sig.x = "001100" and tile_coord_head_sig.y = "010101" report "Writing body to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
assert tile_to_GA_sig = body_tile report "Not a body tile" severity error;
wait until tile_to_GA_sig = head_tile for 50 * CLK_PERIOD;
if tile_to_GA_sig = head_tile then
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Writing head to wrong position" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
else
report "Testbench Timout - not setting head_tile after body_tile has been set" severity failure;
end if;
end if;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait until head_done_sig = '1';
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_death_sig = '0' report "Death and done are not possible at the same time" severity error;
wait for CLK_PERIOD * 10;
-- Test DEATH by BODY
report "Test: DEATH by BODY";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= UP;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= body_tile;
wait until (set_tile_sig = '1' or head_death_sig = '1') for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
report "Setting tile even though snake should die" severity error;
elsif head_death_sig = '1' then
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_done_sig = '0' report "Death and done are not possible at the same time" severity error;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait for CLK_PERIOD * 10;
-- Test DEATH by TAIL
report "Test: DEATH by TAIL";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait for 0 ns;
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= UP;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
wait until tile_coord_head_sig.x /= "000000" and tile_coord_head_sig.y /= "000000";
trigger_head <= '0';
assert tile_coord_head_sig.x = body_tile.parent.x and tile_coord_head_sig.y = body_tile.parent.y report "Wrong coordinate for next head position" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = empty_tile report "tile_to_GA not empty for check" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
last_tile_coord_head_sig <= tile_coord_head_sig;
last_head_done_sig <= head_done_sig;
last_head_death_sig <= head_death_sig;
last_tile_to_GA_sig <= tile_to_GA_sig;
last_set_tile_sig <= set_tile_sig;
wait for CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
wait for 0.1 * CLK_PERIOD;
assert tile_coord_head_sig = last_tile_coord_head_sig report "Coordinate changed during read operation" severity error;
assert set_tile_sig = '0' report "Setting tile without checking" severity error;
assert tile_to_GA_sig = last_tile_to_GA_sig report "tile_to_GA changed during read operation" severity error;
assert head_done_sig = '0' report "Head cannot be done during pos check" severity error;
assert head_death_sig = '0' report "Head cannot die during pos check" severity error;
wait for 0.9 * CLK_PERIOD;
tile_from_GA_sig <= tail_tile;
wait until (set_tile_sig = '1' or head_death_sig = '1') for 50 * CLK_PERIOD;
if set_tile_sig = '1' then
report "Setting tile even though snake should die" severity error;
elsif head_death_sig = '1' then
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_done_sig = '0' report "Death and done are not possible at the same time" severity error;
else
report "Testbench Timeout - never setting tile" severity failure;
end if;
wait for CLK_PERIOD * 10;
-- Test DEATH by WALL (x overflow)
report "Test: DEATH by WALL (x overflow)";
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= RIGHT;
head_pos_out_sig.x <= "111111";
head_pos_out_sig.y <= "010101";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait until head_death_sig = '1' for 50 * CLK_PERIOD;
if head_death_sig = '1' then
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_done_sig = '0' report "Death and done are not possible at the same time" severity error;
else
report "Testbench Timeout - Snake did not die" severity failure;
end if;
wait for CLK_PERIOD * 10;
-- Set last direction to left by actually turning left
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= LEFT;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "010101";
body_tile.parent.x <= "001011";
body_tile.parent.y <= "010101";
wait for CLK_PERIOD * 11;
trigger_head <= '0';
wait for CLK_PERIOD * 10;
-- Test DEATH by WALL (y overflow)
report "Test: DEATH by WALL (y overflow)";
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= DOWN;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "101111";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait until head_death_sig = '1' for 50 * CLK_PERIOD;
if head_death_sig = '1' then
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_done_sig = '0' report "Death and done are not possible at the same time" severity error;
else
report "Testbench Timeout - Snake did not die" severity failure;
end if;
wait for CLK_PERIOD * 10;
-- Test DEATH by WALL (x underflow)
report "Test: DEATH by WALL (x underflow)";
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= LEFT;
head_pos_out_sig.x <= "000000";
head_pos_out_sig.y <= "010101";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait until head_death_sig = '1' for 50 * CLK_PERIOD;
if head_death_sig = '1' then
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_done_sig = '0' report "Death and done are not possible at the same time" severity error;
else
report "Testbench Timeout - Snake did not die" severity failure;
end if;
wait for CLK_PERIOD * 10;
-- Test DEATH by WALL (y underflow)
report "Test: DEATH by WALL (y underflow)";
trigger_head <= '1';
tile_from_GA_sig <= empty_tile;
direction_sig <= UP;
head_pos_out_sig.x <= "001100";
head_pos_out_sig.y <= "000000";
body_tile.parent.x <= "001100";
body_tile.parent.y <= "010100";
wait until head_death_sig = '1' for 50 * CLK_PERIOD;
if head_death_sig = '1' then
assert tile_coord_head_sig.x = "000000" and tile_coord_head_sig.y = "000000" report "Position should be empty in/after done" severity error;
assert tile_to_GA_sig = empty_tile report "Should send empty tile during done state";
assert head_done_sig = '0' report "Death and done are not possible at the same time" severity error;
else
report "Testbench Timeout - Snake did not die" severity failure;
end if;
wait for CLK_PERIOD * 10;
-- Simulation beenden
wait for CLK_PERIOD * 10;
std.env.stop;
end process;
-- monitor : process (clk_sig)
-- begin
-- -- assert direction_sig = LEFT report "T'was left" severity warning;
-- end process;
end Testbench;

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