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