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library ieee; use ieee.std_logic_1164.all; entity ent2 is port ( clk : in std_logic; o : out std_logic ); end; architecture a of ent2 is procedure inv(signal s : inout std_logic) is begin s <= not s; end procedure; signal test : std_logic := '0'; begin process(clk) begin if rising_edge(clk) then inv(test); end if; end process; o <= test; end;