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library ieee;
use ieee.std_logic_1164.all;
entity assert4 is
port (v : std_logic_Vector (7 downto 0);
en : std_logic;
clk : std_logic;
res : out std_logic);
end;
architecture behav of assert4 is
begin
process (clk)
begin
if rising_edge(clk) and en = '1' then
assert v /= x"00";
res <= v(0) xor v(1);
end if;
end process;
end behav;
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