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entity topb is
end topb;
architecture behav of topb is
signal clk : bit;
signal v : natural;
signal done : boolean := false;
begin
dut : entity work.entb
port map (clk => clk,
val => v);
process
begin
clk <= '0';
wait for 10 ns;
clk <= '1';
wait for 10 ns;
if done then
wait;
end if;
end process;
process
begin
v <= 2;
wait for 40 ns;
v <= 4;
wait for 80 ns;
done <= true;
wait;
end process;
end behav;
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