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diff --git a/hdl/main_xula2.vhd b/hdl/main_xula2.vhd
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+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+use IEEE.STD_LOGIC_UNSIGNED.ALL;
+
+
+-- Uncomment the following library declaration if using
+-- arithmetic functions with Signed or Unsigned values
+--use IEEE.NUMERIC_STD.ALL;
+
+-- Uncomment the following library declaration if instantiating
+-- any Xilinx primitives in this code.
+--library UNISIM;
+--use UNISIM.VComponents.all;
+
+entity blinker is
+    Port ( clk_i : in  STD_LOGIC;
+           blinker_o : out  STD_LOGIC);
+end blinker;
+
+architecture Behavioral of blinker is
+signal cnt_r : std_logic_vector(22 downto 0) := (others=>'0');
+begin
+
+process(clk_i) is
+begin
+  if rising_edge(clk_i) then
+    cnt_r <= cnt_r + 1;
+  end if;
+end process;
+
+blinker_o <= cnt_r(22);
+
+end Behavioral;