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entity tb_dff02 is
end tb_dff02;
library ieee;
use ieee.std_logic_1164.all;
architecture behav of tb_dff02 is
signal clk : std_logic;
signal din : std_logic;
signal dout : std_logic;
signal en : std_logic := '0';
signal rst : std_logic := '0';
begin
dut: entity work.dff02
port map (
q => dout,
d => din,
en => en,
rst => rst,
clk => clk);
process
procedure pulse is
begin
clk <= '0';
wait for 1 ns;
clk <= '1';
wait for 1 ns;
end pulse;
begin
din <= '0';
pulse;
assert dout = '1' severity failure;
en <= '1';
pulse;
assert dout = '0' severity failure;
en <= '1';
rst <= '1';
wait for 1 ns;
assert dout = '1' severity failure;
pulse;
assert dout = '1' severity failure;
rst <= '0';
pulse;
assert dout = '0' severity failure;
wait;
end process;
end behav;
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