Subversion Repositories cordic

--

-- sc_corproc.vhd

--

-- Calculates Sine and Cosine values

--

-- uses: p2r_codic.vhd and p2r_cordicpipe.vhd

--

--

--

-- system delay: 21 (data out delay: 20)

--

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_arith.all;

entity sc_corproc is

        port(

                clk     : in std_logic;

                ena     : in std_logic;

                Ain     : in signed(15 downto 0);

                sin     : out signed(15 downto 0);

                cos     : out signed(15 downto 0));

end entity sc_corproc;

architecture dataflow of sc_corproc is

        constant PipeLength : natural := 15;

        constant P : signed(15 downto 0) := x"4dba";     -- define aggregate constant

        component p2r_cordic is

        generic(

                PIPELINE : integer := 15;

                WIDTH    : integer := 16);

        port(

                clk : in std_logic;

                ena : in std_logic;

                Xi : in signed(WIDTH -1 downto 0);

                Yi : in signed(WIDTH -1 downto 0) := (others => '0');

                Zi : in signed(WIDTH -1 downto 0);

                Xo : out signed(WIDTH -1 downto 0);

                Yo : out signed(WIDTH -1 downto 0)

        );

        end component p2r_cordic;

begin

        u1:     p2r_cordic

                        generic map(PIPELINE => PipeLength, WIDTH => 16)

                        port map(clk => clk, ena => ena, Xi => P, Zi => Ain, Xo => cos, Yo => sin);

end architecture dataflow;