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diff --git a/testsuite/examples/dff/negdff.vhdl b/testsuite/examples/dff/negdff.vhdl
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+library ieee;
+use ieee.std_logic_1164.all;
+
+entity negdff is
+ port(
+ clk : in std_logic;
+ d : in std_logic;
+ q : out std_logic
+ );
+end entity;
+
+architecture arch of negdff is
+begin
+ process (clk)
+ begin
+ if falling_edge(clk) then
+ q <= d;
+ end if;
+ end process;
+end architecture;