How can i use CORDIC ?

Hello i am trying to use the cordic core { http://opencores.org/project,cordic }

SIGNAL real_i : signed(15 downto 0) := "00000000"& "00000100" ;
SIGNAL imag_i : signed(15 downto 0) := "00000000"& "00000101" ;
SIGNAL ena_r_i : std_logic := '1';
SIGNAL rst_negado : std_logic := '1';
SIGNAL result_ang_o : unsigned(19 downto 0);
SIGNAL result_mag_o :  signed(19 downto 0) ;
SIGNAL test_clk: std_logic := '0';
-- component instatiation
component rl131 is
	port(
		clk_i    : in std_logic;
        rst_i_n  : in std_logic;
		ena_i    : in std_logic;
		Real_i	: in signed(15 downto 0);
		Imag_i   : in signed(15 downto 0);
		Rout_o	: out unsigned(19 downto 0);
		Aout_o	: out signed(19 downto 0)
	);
	end component;
BEGIN
 dut : rl131
	port map(
	 clk_i => test_clk,
	 ena_i => ena_r_i,
	 rst_i_n => rst_negado,
	 Real_i => real_i, 
	 Imag_i => imag_i, 
	 Rout_o => result_ang_o, 
	 Aout_o => result_mag_o);
  
test_clk <= not test_clk after clkperiod/2;