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feddischso |
----------------------------------------------------------------------------
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---- ----
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---- File : cordic_iterative_int.vhd ----
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---- Project : YAC (Yet Another CORDIC Core) ----
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---- Creation : Feb. 2014 ----
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---- Limitations : ----
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---- Synthesizer : ----
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---- Target : ----
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---- ----
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---- Author(s): : Christian Haettich ----
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---- Email : feddischson@opencores.org ----
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---- ----
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---- ----
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----- -----
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---- ----
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---- Description ----
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---- VHDL implementation of YAC ----
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---- ----
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---- ----
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---- ----
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----- -----
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---- ----
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---- TODO ----
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---- Some documentation and function description ----
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---- Optimization ----
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---- ----
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---- ----
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---- ----
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----------------------------------------------------------------------------
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---- ----
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---- Copyright Notice ----
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---- ----
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---- This file is part of YAC - Yet Another CORDIC Core ----
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---- Copyright (c) 2014, Author(s), All rights reserved. ----
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---- ----
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---- YAC is free software; you can redistribute it and/or ----
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---- modify it under the terms of the GNU Lesser General Public ----
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---- License as published by the Free Software Foundation; either ----
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---- version 3.0 of the License, or (at your option) any later version. ----
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---- ----
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---- YAC is distributed in the hope that it will be useful, ----
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---- but WITHOUT ANY WARRANTY; without even the implied warranty of ----
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---- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ----
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---- Lesser General Public License for more details. ----
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---- ----
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---- You should have received a copy of the GNU Lesser General Public ----
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---- License along with this library. If not, download it from ----
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---- http://www.gnu.org/licenses/lgpl ----
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---- ----
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----------------------------------------------------------------------------
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library ieee;
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library std;
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use std.textio.all;
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use ieee.std_logic_1164.ALL;
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use ieee.numeric_std.ALL;
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use ieee.std_logic_textio.all; -- I/O for logic types
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use work.cordic_pkg.ALL;
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use ieee.math_real.ALL;
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entity cordic_iterative_int is
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generic(
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XY_WIDTH : natural := 12;
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A_WIDTH : natural := 12;
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GUARD_BITS : natural := 2;
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RM_GAIN : natural := 4
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);
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port(
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clk, rst : in std_logic;
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en : in std_logic;
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start : in std_logic;
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done : out std_logic;
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mode_i : in std_logic_vector( 4-1 downto 0 );
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x_i : in std_logic_vector( XY_WIDTH-1 downto 0 );
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y_i : in std_logic_vector( XY_WIDTH-1 downto 0 );
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a_i : in std_logic_vector( A_WIDTH+2-1 downto 0 );
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x_o : out std_logic_vector( XY_WIDTH+GUARD_BITS-1 downto 0 );
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y_o : out std_logic_vector( XY_WIDTH+GUARD_BITS-1 downto 0 );
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a_o : out std_logic_vector( A_WIDTH+2-1 downto 0 )
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);
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end entity cordic_iterative_int;
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architecture BEHAVIORAL of cordic_iterative_int is
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-- log2( max-iteration )
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constant L2_MAX_I : natural := 8;
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constant MAX_A_WIDTH : natural := 34;
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-- Internal angle width
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constant A_WIDTH_I : natural := A_WIDTH+2;
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feddischso |
<<<<<<< HEAD
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feddischso |
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constant SQRT2_REAL : real := 1.4142135623730951454746218587388284504413604;
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constant PI_REAL : real := 3.1415926535897931159979634685441851615905762;
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constant PI : integer := natural( PI_REAL * real( 2**( A_WIDTH-1 ) ) + 0.5 );
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constant PI_H : integer := natural( PI_REAL * real( 2**( A_WIDTH-2 ) ) + 0.5 );
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constant SQRT2 : integer := natural( SQRT2_REAL * real( 2**( XY_WIDTH-1 ) ) + 0.5 );
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constant XY_MAX : integer := natural( 2**( XY_WIDTH-1)-1);
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feddischso |
=======
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constant PI_REAL : real := 3.1415926535897931159979634685441851615905762;
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constant PI : integer := natural( PI_REAL * real( 2**( A_WIDTH-1 ) ) + 0.5 );
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constant PI_H : integer := natural( PI_REAL * real( 2**( A_WIDTH-2 ) ) + 0.5 );
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>>>>>>> initial commit
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feddischso |
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constant XY_WIDTH_G : natural := XY_WIDTH + GUARD_BITS;
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type state_st is( ST_IDLE, ST_INIT, ST_ROTATE, ST_RM_GAIN, ST_DONE );
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type state_t is record
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st : state_st;
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mode : std_logic_vector( mode_i'range );
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x : signed( XY_WIDTH_G -1 downto 0 );
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y : signed( XY_WIDTH_G -1 downto 0 );
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x_sh : signed( XY_WIDTH_G -1 downto 0 );
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y_sh : signed( XY_WIDTH_G -1 downto 0 );
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x_sum : signed( XY_WIDTH_G -1 downto 0 );
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y_sum : signed( XY_WIDTH_G -1 downto 0 );
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a : signed( A_WIDTH_I -1 downto 0 );
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a_tmp : signed( A_WIDTH_I -1 downto 0 );
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ylst : signed( XY_WIDTH_G -1 downto 0 );
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alst : signed( A_WIDTH_I -1 downto 0 );
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i : signed( L2_MAX_I -1 downto 0 );
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do_shift : std_logic;
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done : std_logic;
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repeate : std_logic;
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end record state_t;
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signal state : state_t;
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---------------------------------------
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-- Auto-generated function
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-- by matlab (see c_octave/cordic_iterative_code.m)
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function angular_lut( n : integer; mode : std_logic_vector; ANG_WIDTH : natural ) return signed is
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variable result : signed( ANG_WIDTH-1 downto 0 );
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variable temp : signed( MAX_A_WIDTH-1 downto 0 );
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begin
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if mode = VAL_MODE_CIR then
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case n is
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when 0 => temp := "0110010010000111111011010101000100"; -- -1843415740
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when 1 => temp := "0011101101011000110011100000101011"; -- -312264661
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when 2 => temp := "0001111101011011011101011111100100"; -- 2104350692
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when 3 => temp := "0000111111101010110111010100110101"; -- 1068201269
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when 4 => temp := "0000011111111101010101101110110111"; -- 536173495
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when 5 => temp := "0000001111111111101010101011011101"; -- 268348125
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when 6 => temp := "0000000111111111111101010101010110"; -- 134206806
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when 7 => temp := "0000000011111111111111101010101010"; -- 67107498
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when 8 => temp := "0000000001111111111111111101010101"; -- 33554261
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when 9 => temp := "0000000000111111111111111111101010"; -- 16777194
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when 10 => temp := "0000000000011111111111111111111101"; -- 8388605
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when others => temp := to_signed( 2**(MAX_A_WIDTH-1-n), MAX_A_WIDTH );
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end case;
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elsif mode = VAL_MODE_HYP then
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case n is
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when 1 => temp := "0100011001001111101010011110101010"; -- 423536554
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when 2 => temp := "0010000010110001010111011111010100"; -- -2100987948
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when 3 => temp := "0001000000010101100010010001110010"; -- 1079387250
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when 4 => temp := "0000100000000010101011000100010101"; -- 537571605
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when 5 => temp := "0000010000000000010101010110001000"; -- 268522888
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when 6 => temp := "0000001000000000000010101010101100"; -- 134228652
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when 7 => temp := "0000000100000000000000010101010101"; -- 67110229
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when 8 => temp := "0000000010000000000000000010101010"; -- 33554602
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when 9 => temp := "0000000001000000000000000000010101"; -- 16777237
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when 10 => temp := "0000000000100000000000000000000010"; -- 8388610
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when others => temp := to_signed( 2**(MAX_A_WIDTH-1-n), MAX_A_WIDTH );
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end case;
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elsif mode = VAL_MODE_LIN then
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temp := ( others => '0' );
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temp( temp'high-1-n downto 0 ) := ( others => '1' );
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end if;
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result := temp( temp'high downto temp'high-result'length+1 );
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return result;
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end function angular_lut;
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---------------------------------------
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function repeat_hyperbolic_it( i : integer ) return boolean is
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variable res : boolean;
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begin
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case i is
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when 5 => res := true;
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when 14 => res := true;
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when 41 => res := true;
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when 122 => res := true;
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when others => res := false;
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end case;
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return res;
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end;
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begin
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ST : process( clk, rst )
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variable sign : std_logic;
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begin
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if clk'event and clk = '1' then
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if rst = '1' then
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state <= ( st => ST_IDLE,
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x => ( others => '0' ),
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y => ( others => '0' ),
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x_sh => ( others => '0' ),
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y_sh => ( others => '0' ),
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x_sum => ( others => '0' ),
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y_sum => ( others => '0' ),
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a => ( others => '0' ),
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a_tmp => ( others => '0' ),
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ylst => ( others => '0' ),
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alst => ( others => '0' ),
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mode => ( others => '0' ),
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i => ( others => '0' ),
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done => '0',
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do_shift => '0',
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repeate => '0'
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);
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elsif en = '1' then
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if state.st = ST_IDLE and start = '1' then
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state.st <= ST_INIT;
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state.mode <= mode_i;
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state.x <= resize( signed( x_i ), state.x'length );
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state.y <= resize( signed( y_i ), state.y'length );
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state.a <= resize( signed( a_i ), state.a'length );
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state.i <= ( others => '0' );
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3 |
feddischso |
<<<<<<< HEAD
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2 |
feddischso |
elsif state.st = ST_INIT then
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--
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-- initialization state
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-- -> do initial rotation (alignment)
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-- -> check special situations / miss-configurations (TODO)
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--
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3 |
feddischso |
=======
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--
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-- initialization state
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-- -> do initial rotation (alignment)
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-- -> check special situations / miss-configurations (TODO)
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--
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elsif state.st = ST_INIT then
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>>>>>>> initial commit
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2 |
feddischso |
state.st <= ST_ROTATE;
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state.do_shift <= '1';
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3 |
feddischso |
<<<<<<< HEAD
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2 |
feddischso |
if state.mode( 1 downto 0 ) = VAL_MODE_HYP then
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-- if we do a hyperbolic rotation, we start with 1
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3 |
feddischso |
=======
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-- if we do a hyperbolic rotation, we start with 1
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if state.mode( 1 downto 0 ) = VAL_MODE_HYP then
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>>>>>>> initial commit
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2 |
feddischso |
state.i(0) <= '1';
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end if;
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3 |
feddischso |
<<<<<<< HEAD
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2 |
feddischso |
if state.mode( I_FLAG_VEC_ROT ) = '0'
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and state.mode( 1 downto 0 ) = VAL_MODE_CIR then
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-- circular vector mode
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if state.a < - PI_H then
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-- move from third quadrant to first
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state.a <= state.a + PI;
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state.x <= - state.x;
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state.y <= - state.y;
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elsif state.a > PI_H then
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-- move from second quadrant to fourth
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3 |
feddischso |
=======
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-- circular vector mode
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if state.mode( FLAG_VEC_ROT ) = '0'
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and state.mode( 1 downto 0 ) = VAL_MODE_CIR then
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-- move from third quadrant to first
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if state.a < - PI_H then
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state.a <= state.a + PI;
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state.x <= - state.x;
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state.y <= - state.y;
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-- move from second quadrant to fourth
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elsif state.a > PI_H then
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>>>>>>> initial commit
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2 |
feddischso |
state.a <= state.a - PI;
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state.x <= - state.x;
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state.y <= - state.y;
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end if;
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3 |
feddischso |
<<<<<<< HEAD
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2 |
feddischso |
elsif state.mode( I_FLAG_VEC_ROT ) = '1'
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and state.mode( 1 downto 0 ) = VAL_MODE_CIR then
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-- circular rotation mode
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if state.x = 0 and state.y = 0 then
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-- zero-input
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state.a <= ( others => '0' );
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state.y <= ( others => '0' );
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state.st <= ST_DONE;
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elsif state.x = XY_MAX and state.y = XY_MAX then
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-- all-max 1
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state.a <= resize( angular_lut( 0, state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I );
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state.x <= to_signed( SQRT2, state.x'length );
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state.y <= (others => '0' );
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state.st <= ST_DONE;
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elsif state.x = -XY_MAX and state.y = -XY_MAX then
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-- all-max 2
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state.a <= resize( angular_lut( 0, state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I ) - PI;
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state.x <= to_signed( SQRT2, state.x'length );
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state.y <= (others => '0' );
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state.st <= ST_DONE;
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elsif state.x = XY_MAX and state.y = -XY_MAX then
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-- all-max 3
|
| 322 |
|
|
state.a <= resize( -angular_lut( 0, state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I );
|
| 323 |
|
|
state.x <= to_signed( SQRT2, state.x'length );
|
| 324 |
|
|
state.y <= (others => '0' );
|
| 325 |
|
|
state.st <= ST_DONE;
|
| 326 |
|
|
elsif state.x = -XY_MAX and state.y = XY_MAX then
|
| 327 |
|
|
-- all-max 4
|
| 328 |
|
|
state.a <= PI- resize( angular_lut( 0, state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I );
|
| 329 |
|
|
state.x <= to_signed( SQRT2, state.x'length );
|
| 330 |
|
|
state.y <= (others => '0' );
|
| 331 |
|
|
state.st <= ST_DONE;
|
| 332 |
|
|
|
| 333 |
|
|
elsif state.x = 0 and state.y > 0 then
|
| 334 |
|
|
-- fixed rotation of pi/2
|
| 335 |
|
|
state.a <= to_signed( PI_H, state.a'length );
|
| 336 |
|
|
state.x <= state.y;
|
| 337 |
|
|
state.y <= ( others => '0' );
|
| 338 |
|
|
state.st<= ST_DONE;
|
| 339 |
|
|
elsif state.x = 0 and state.y < 0 then
|
| 340 |
|
|
-- fixed rotation of -pi/2
|
| 341 |
|
|
state.a <= to_signed( -PI_H, state.a'length );
|
| 342 |
|
|
state.x <= -state.y;
|
| 343 |
|
|
state.y <= ( others => '0' );
|
| 344 |
|
|
state.st<= ST_DONE;
|
| 345 |
|
|
|
| 346 |
|
|
elsif state.x < 0 and state.y >= 0 then
|
| 347 |
|
|
-- move from second quadrant to fourth
|
| 348 |
|
|
state.x <= - state.x;
|
| 349 |
|
|
state.y <= - state.y;
|
| 350 |
|
|
state.a <= to_signed( PI, state.a'length );
|
| 351 |
|
|
elsif state.x < 0 and state.y < 0 then
|
| 352 |
|
|
-- move from third quadrant to first
|
| 353 |
|
|
state.x <= - state.x;
|
| 354 |
|
|
state.y <= - state.y;
|
| 355 |
|
|
state.a <= to_signed( -PI, state.a'length );
|
| 356 |
|
|
else
|
| 357 |
|
|
state.a <= ( others => '0' );
|
| 358 |
|
|
end if;
|
| 359 |
|
|
elsif state.mode( I_FLAG_VEC_ROT ) = '1'
|
| 360 |
|
|
and state.mode( 1 downto 0 ) = VAL_MODE_LIN then
|
| 361 |
|
|
-- linear rotation mode
|
| 362 |
|
|
if state.x < 0 then
|
| 363 |
|
|
state.x <= - state.x;
|
| 364 |
|
|
state.y <= - state.y;
|
| 365 |
|
|
end if;
|
| 366 |
|
|
state.a <= to_signed( 0, state.a'length );
|
| 367 |
3 |
feddischso |
=======
|
| 368 |
|
|
-- circular rotation mode
|
| 369 |
|
|
elsif state.mode( FLAG_VEC_ROT ) = '1'
|
| 370 |
|
|
and state.mode( 1 downto 0 ) = VAL_MODE_CIR then
|
| 371 |
2 |
feddischso |
|
| 372 |
3 |
feddischso |
-- move from second quadrant to fourth
|
| 373 |
|
|
if state.x < 0 and state.y > 0 then
|
| 374 |
|
|
state.x <= - state.x;
|
| 375 |
|
|
state.y <= - state.y;
|
| 376 |
|
|
state.a <= to_signed( PI, state.a'length );
|
| 377 |
|
|
-- move from third quadrant to first
|
| 378 |
|
|
elsif state.x < 0 and state.y < 0 then
|
| 379 |
|
|
state.x <= - state.x;
|
| 380 |
|
|
state.y <= - state.y;
|
| 381 |
|
|
state.a <= to_signed( -PI, state.a'length );
|
| 382 |
|
|
-- y=0 condition
|
| 383 |
|
|
elsif state.x < 0 and state.y = 0 then
|
| 384 |
|
|
state.a <= to_signed( PI, state.a'length );
|
| 385 |
|
|
state.st<= ST_DONE;
|
| 386 |
|
|
else
|
| 387 |
|
|
state.a <= ( others => '0' );
|
| 388 |
|
|
end if;
|
| 389 |
|
|
-- linear rotation mode
|
| 390 |
|
|
elsif state.mode( FLAG_VEC_ROT ) = '1'
|
| 391 |
|
|
and state.mode( 1 downto 0 ) = VAL_MODE_LIN then
|
| 392 |
|
|
|
| 393 |
|
|
if state.x < 0 then
|
| 394 |
|
|
state.x <= - state.x;
|
| 395 |
|
|
state.y <= - state.y;
|
| 396 |
|
|
end if;
|
| 397 |
|
|
state.a <= to_signed( 0, state.a'length );
|
| 398 |
|
|
>>>>>>> initial commit
|
| 399 |
|
|
|
| 400 |
2 |
feddischso |
end if;
|
| 401 |
|
|
|
| 402 |
|
|
|
| 403 |
|
|
|
| 404 |
|
|
|
| 405 |
|
|
|
| 406 |
|
|
--
|
| 407 |
|
|
-- rotation state
|
| 408 |
|
|
--
|
| 409 |
|
|
-- Each rotation takes
|
| 410 |
|
|
-- two steps: in the first step, the shifting is
|
| 411 |
|
|
-- done, in the second step, the
|
| 412 |
|
|
-- shift-result is added/subtracted
|
| 413 |
|
|
--
|
| 414 |
|
|
--
|
| 415 |
|
|
--
|
| 416 |
|
|
elsif state.st = ST_ROTATE then
|
| 417 |
|
|
|
| 418 |
|
|
-- get the sign
|
| 419 |
3 |
feddischso |
<<<<<<< HEAD
|
| 420 |
2 |
feddischso |
if state.mode( I_FLAG_VEC_ROT ) = '0' then
|
| 421 |
3 |
feddischso |
=======
|
| 422 |
|
|
if state.mode( FLAG_VEC_ROT ) = '0' then
|
| 423 |
|
|
>>>>>>> initial commit
|
| 424 |
2 |
feddischso |
if state.a < 0 then
|
| 425 |
|
|
sign := '0';
|
| 426 |
|
|
else
|
| 427 |
|
|
sign := '1';
|
| 428 |
|
|
end if;
|
| 429 |
|
|
else
|
| 430 |
|
|
if state.y < 0 then
|
| 431 |
|
|
sign := '1';
|
| 432 |
|
|
else
|
| 433 |
|
|
sign := '0';
|
| 434 |
|
|
end if;
|
| 435 |
|
|
end if;
|
| 436 |
|
|
|
| 437 |
|
|
|
| 438 |
|
|
|
| 439 |
|
|
if state.do_shift = '1' then
|
| 440 |
|
|
-- get the angle, do the shifting and set the right angle
|
| 441 |
|
|
|
| 442 |
|
|
if sign = '1' then
|
| 443 |
|
|
|
| 444 |
|
|
-- circular case
|
| 445 |
|
|
if state.mode( 1 downto 0 ) = VAL_MODE_CIR then
|
| 446 |
|
|
|
| 447 |
|
|
state.a_tmp <= resize( - angular_lut( to_integer( state.i ), state.mode( 1 downto 0 ), A_WIDTH), A_WIDTH_I );
|
| 448 |
|
|
state.y_sh <= - SHIFT_RIGHT( state.y, to_integer( state.i ) );
|
| 449 |
|
|
|
| 450 |
|
|
-- hyperbolic case
|
| 451 |
|
|
elsif state.mode( 1 downto 0 ) = VAL_MODE_HYP then
|
| 452 |
|
|
|
| 453 |
|
|
state.a_tmp <= resize( - angular_lut( to_integer( state.i ), state.mode( 1 downto 0 ), A_WIDTH), A_WIDTH_I );
|
| 454 |
|
|
state.y_sh <= SHIFT_RIGHT( state.y, to_integer( state.i ) );
|
| 455 |
|
|
|
| 456 |
|
|
-- linear case
|
| 457 |
|
|
else
|
| 458 |
|
|
|
| 459 |
|
|
state.a_tmp <= resize( - angular_lut( to_integer( state.i ), state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I ) ;
|
| 460 |
|
|
state.y_sh <= ( others => '0' );
|
| 461 |
|
|
|
| 462 |
|
|
end if;
|
| 463 |
|
|
state.x_sh <= SHIFT_RIGHT( state.x, to_integer( state.i ) );
|
| 464 |
|
|
|
| 465 |
|
|
else
|
| 466 |
|
|
|
| 467 |
|
|
-- circular case
|
| 468 |
|
|
if state.mode( 1 downto 0 ) = VAL_MODE_CIR then
|
| 469 |
|
|
|
| 470 |
|
|
state.a_tmp <= resize( angular_lut( to_integer( state.i ), state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I );
|
| 471 |
|
|
state.y_sh <= SHIFT_RIGHT( state.y, to_integer( state.i ) );
|
| 472 |
|
|
|
| 473 |
|
|
-- hyperbolic case
|
| 474 |
|
|
elsif state.mode( 1 downto 0 ) = VAL_MODE_HYP then
|
| 475 |
|
|
|
| 476 |
|
|
state.a_tmp <= resize( angular_lut( to_integer( state.i ), state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I );
|
| 477 |
|
|
state.y_sh <= - SHIFT_RIGHT( state.y, to_integer( state.i ) );
|
| 478 |
|
|
|
| 479 |
|
|
-- linear case
|
| 480 |
|
|
else
|
| 481 |
|
|
|
| 482 |
|
|
state.a_tmp <= resize( angular_lut( to_integer( state.i ), state.mode( 1 downto 0 ), A_WIDTH ), A_WIDTH_I ) ;
|
| 483 |
|
|
state.y_sh <= ( others => '0' );
|
| 484 |
|
|
|
| 485 |
|
|
end if;
|
| 486 |
|
|
state.x_sh <= - SHIFT_RIGHT( state.x, to_integer( state.i ) );
|
| 487 |
|
|
|
| 488 |
|
|
end if;
|
| 489 |
|
|
state.do_shift <= '0';
|
| 490 |
|
|
|
| 491 |
|
|
-- abort condition
|
| 492 |
3 |
feddischso |
<<<<<<< HEAD
|
| 493 |
2 |
feddischso |
if( state.mode( I_FLAG_VEC_ROT ) = '0' and
|
| 494 |
|
|
state.a = 0 ) then
|
| 495 |
|
|
state.st <= ST_RM_GAIN;
|
| 496 |
|
|
state.i <= ( others => '0' );
|
| 497 |
|
|
elsif( state.mode( I_FLAG_VEC_ROT ) = '0' and
|
| 498 |
|
|
state.a = state.alst ) then
|
| 499 |
|
|
state.st <= ST_RM_GAIN;
|
| 500 |
|
|
state.i <= ( others => '0' );
|
| 501 |
|
|
elsif( state.mode( I_FLAG_VEC_ROT ) = '1' and
|
| 502 |
|
|
state.y = 0 ) then
|
| 503 |
|
|
state.st <= ST_RM_GAIN;
|
| 504 |
|
|
state.i <= ( others => '0' );
|
| 505 |
|
|
elsif( state.mode( I_FLAG_VEC_ROT ) = '1' and
|
| 506 |
3 |
feddischso |
=======
|
| 507 |
|
|
if( state.mode( FLAG_VEC_ROT ) = '0' and
|
| 508 |
|
|
( state.a = 0 or state.a = -1 ) ) then
|
| 509 |
|
|
state.st <= ST_RM_GAIN;
|
| 510 |
|
|
state.i <= ( others => '0' );
|
| 511 |
|
|
elsif( state.mode( FLAG_VEC_ROT ) = '0' and
|
| 512 |
|
|
( state.a = state.alst ) ) then
|
| 513 |
|
|
state.st <= ST_RM_GAIN;
|
| 514 |
|
|
state.i <= ( others => '0' );
|
| 515 |
|
|
elsif( state.mode( FLAG_VEC_ROT ) = '1' and
|
| 516 |
|
|
( state.y = 0 or state.y = -1 ) ) then
|
| 517 |
|
|
state.st <= ST_RM_GAIN;
|
| 518 |
|
|
state.i <= ( others => '0' );
|
| 519 |
|
|
elsif( state.mode( FLAG_VEC_ROT ) = '1' and
|
| 520 |
|
|
>>>>>>> initial commit
|
| 521 |
2 |
feddischso |
( state.y = state.ylst ) ) then
|
| 522 |
|
|
state.st <= ST_RM_GAIN;
|
| 523 |
|
|
state.i <= ( others => '0' );
|
| 524 |
|
|
end if;
|
| 525 |
|
|
|
| 526 |
|
|
state.ylst <= state.y;
|
| 527 |
|
|
state.alst <= state.a;
|
| 528 |
|
|
|
| 529 |
|
|
|
| 530 |
|
|
else
|
| 531 |
|
|
state.x <= state.x + state.y_sh;
|
| 532 |
|
|
state.y <= state.y + state.x_sh;
|
| 533 |
|
|
state.a <= state.a + state.a_tmp;
|
| 534 |
|
|
if VAL_MODE_HYP = state.mode( 1 downto 0 ) and
|
| 535 |
|
|
state.repeate = '0' and
|
| 536 |
|
|
repeat_hyperbolic_it( to_integer( state.i ) ) then
|
| 537 |
|
|
state.repeate <= '1';
|
| 538 |
|
|
else
|
| 539 |
|
|
state.repeate <= '0';
|
| 540 |
|
|
state.i <= state.i+1;
|
| 541 |
|
|
end if;
|
| 542 |
|
|
state.do_shift <= '1';
|
| 543 |
|
|
end if;
|
| 544 |
|
|
|
| 545 |
|
|
|
| 546 |
|
|
|
| 547 |
|
|
|
| 548 |
|
|
|
| 549 |
|
|
--
|
| 550 |
|
|
-- removal of the cordic gain
|
| 551 |
|
|
--
|
| 552 |
|
|
elsif state.st = ST_RM_GAIN then
|
| 553 |
|
|
-- we need RM_GAIN+1 cycles to
|
| 554 |
|
|
-- calculate the RM_GAIN steps
|
| 555 |
|
|
if state.i = (RM_GAIN) then
|
| 556 |
|
|
state.st <= ST_DONE;
|
| 557 |
|
|
state.done <= '1';
|
| 558 |
|
|
state.i <= ( others => '0' );
|
| 559 |
|
|
else
|
| 560 |
|
|
state.i <= state.i + 1;
|
| 561 |
|
|
end if;
|
| 562 |
|
|
|
| 563 |
|
|
if state.mode( 1 downto 0 ) = VAL_MODE_CIR then
|
| 564 |
|
|
mult_0_61( state.x, state.x_sh, state.x_sum, to_integer( state.i ), RM_GAIN );
|
| 565 |
|
|
mult_0_61( state.y, state.y_sh, state.y_sum, to_integer( state.i ), RM_GAIN );
|
| 566 |
|
|
elsif state.mode( 1 downto 0 ) = VAL_MODE_HYP then
|
| 567 |
|
|
mult_0_21( state.x, state.x_sh, state.x_sum, to_integer( state.i ), RM_GAIN );
|
| 568 |
|
|
mult_0_21( state.y, state.y_sh, state.y_sum, to_integer( state.i ), RM_GAIN );
|
| 569 |
|
|
else
|
| 570 |
|
|
-- TODO merge ST_DONE and state.done
|
| 571 |
|
|
state.done <= '1';
|
| 572 |
|
|
state.st <= ST_DONE;
|
| 573 |
|
|
state.x_sum <= state.x;
|
| 574 |
|
|
state.y_sum <= state.y;
|
| 575 |
|
|
end if;
|
| 576 |
|
|
|
| 577 |
|
|
|
| 578 |
|
|
elsif state.st = ST_DONE then
|
| 579 |
|
|
state.st <= ST_IDLE;
|
| 580 |
|
|
state.done <= '0';
|
| 581 |
|
|
end if;
|
| 582 |
|
|
-- end states
|
| 583 |
|
|
|
| 584 |
|
|
|
| 585 |
|
|
|
| 586 |
|
|
end if;
|
| 587 |
|
|
-- end ena
|
| 588 |
|
|
|
| 589 |
|
|
|
| 590 |
|
|
end if;
|
| 591 |
|
|
-- end clk
|
| 592 |
|
|
|
| 593 |
|
|
end process;
|
| 594 |
|
|
done <= state.done ;
|
| 595 |
|
|
x_o <= std_logic_vector( state.x_sum );
|
| 596 |
|
|
y_o <= std_logic_vector( state.y_sum );
|
| 597 |
|
|
a_o <= std_logic_vector( state.a );
|
| 598 |
|
|
|
| 599 |
|
|
end architecture BEHAVIORAL;
|
| 600 |
|
|
|
| 601 |
|
|
|
| 602 |
|
|
|
