sc_corproc.vhd

基于CORDIC算法的

--
-- 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, 
  	  Yi  => open,
  	  Zi  => Ain, 
  	  Xo  => cos, 
  	  Yo  => sin);
end architecture dataflow;