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library IEEE; use IEEE.std_logic_1164.all; entity Testcase_CE is port ( CLK : in std_logic ); end Testcase_CE; architecture RTL of Testcase_CE is signal y : std_logic; signal x : std_logic; begin process (CLK) begin if CLK'event and CLK='1' then x <= y when false else '0'; end if; end process; end RTL;