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-------------------------------------------------------------------------------
-- File Name :  FDCT.vhd
--
-- Project   : JPEG_ENC
--
-- Module    : FDCT
--
-- Content   : FDCT
--
-- Description : 2D Discrete Cosine Transform
--
-- Spec.     : 
--
-- Author    : Michal Krepa
--
-------------------------------------------------------------------------------
-- History :
-- 20090301: (MK): Initial Creation.
-------------------------------------------------------------------------------
 
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
----------------------------------- LIBRARY/PACKAGE ---------------------------
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
 
-------------------------------------------------------------------------------
-- generic packages/libraries:
-------------------------------------------------------------------------------
library ieee;
  use ieee.std_logic_1164.all;
  use ieee.numeric_std.all;
 
-------------------------------------------------------------------------------
-- user packages/libraries:
-------------------------------------------------------------------------------
library work;
  use work.JPEG_PKG.all;
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
----------------------------------- ENTITY ------------------------------------
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
entity FDCT is
  port
  (
        CLK                : in  std_logic;
        RST                : in  std_logic;
        -- CTRL
        start_pb           : in  std_logic;
        ready_pb           : out std_logic;
        fdct_sm_settings   : in  T_SM_SETTINGS;
 
        -- BUF_FIFO
        bf_fifo_rd         : out std_logic;
        bf_fifo_q          : in  std_logic_vector(23 downto 0);
        bf_fifo_hf_full    : in  std_logic;
 
        -- ZIG ZAG
        zz_buf_sel         : in  std_logic;
        zz_rd_addr         : in  std_logic_vector(5 downto 0);
        zz_data            : out std_logic_vector(11 downto 0);
        zz_rden            : in  std_logic;
 
        -- HOST
        img_size_x         : in  std_logic_vector(15 downto 0);
        img_size_y         : in  std_logic_vector(15 downto 0);
        sof                : in  std_logic
    );
end entity FDCT;
 
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
----------------------------------- ARCHITECTURE ------------------------------
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
architecture RTL of FDCT is
 
  constant C_Y_1       : signed(14 downto 0) := to_signed(4899,  15);
  constant C_Y_2       : signed(14 downto 0) := to_signed(9617,  15);
  constant C_Y_3       : signed(14 downto 0) := to_signed(1868,  15);
  constant C_Cb_1      : signed(14 downto 0) := to_signed(-2764, 15);
  constant C_Cb_2      : signed(14 downto 0) := to_signed(-5428, 15);
  constant C_Cb_3      : signed(14 downto 0) := to_signed(8192,  15);
  constant C_Cr_1      : signed(14 downto 0) := to_signed(8192,  15);
  constant C_Cr_2      : signed(14 downto 0) := to_signed(-6860, 15);
  constant C_Cr_3      : signed(14 downto 0) := to_signed(-1332, 15);
 
 
  signal mdct_data_in      : std_logic_vector(7 downto 0);
  signal mdct_idval        : std_logic;
  signal mdct_odval        : std_logic;
  signal mdct_data_out     : std_logic_vector(11 downto 0);
  signal odv1              : std_logic;
  signal dcto1             : std_logic_vector(11 downto 0);
  signal x_pixel_cnt       : unsigned(15 downto 0);
  signal y_line_cnt        : unsigned(15 downto 0);
  signal rd_addr           : std_logic_vector(31 downto 0);
  signal input_rd_cnt      : unsigned(6 downto 0);
  signal rd_en             : std_logic;
  signal rd_en_d1          : std_logic;
  signal rdaddr            : unsigned(31 downto 0);
  signal bf_dval           : std_logic;
  signal bf_dval_m1        : std_logic;
  signal bf_dval_m2        : std_logic;
  signal bf_dval_m3        : std_logic;
  signal wr_cnt            : unsigned(5 downto 0);
  signal dbuf_data         : std_logic_vector(11 downto 0);
  signal dbuf_q            : std_logic_vector(11 downto 0);
  signal dbuf_we           : std_logic;
  signal dbuf_waddr        : std_logic_vector(6 downto 0);
  signal dbuf_raddr        : std_logic_vector(6 downto 0);
  signal xw_cnt            : unsigned(2 downto 0);
  signal yw_cnt            : unsigned(2 downto 0);
 
  signal dbuf_q_z1         : std_logic_vector(11 downto 0);
  constant C_SIMA_ASZ      : integer := 9;
  signal sim_rd_addr       : unsigned(C_SIMA_ASZ-1 downto 0);
  signal Y_reg_1           : signed(23 downto 0);
  signal Y_reg_2           : signed(23 downto 0);
  signal Y_reg_3           : signed(23 downto 0);
  signal Cb_reg_1          : signed(23 downto 0);
  signal Cb_reg_2          : signed(23 downto 0);
  signal Cb_reg_3          : signed(23 downto 0);
  signal Cr_reg_1          : signed(23 downto 0);
  signal Cr_reg_2          : signed(23 downto 0);
  signal Cr_reg_3          : signed(23 downto 0);
  signal Y_reg             : signed(23 downto 0);
  signal Cb_reg            : signed(23 downto 0);
  signal Cr_reg            : signed(23 downto 0);
  signal R_s               : signed(8 downto 0);
  signal G_s               : signed(8 downto 0);
  signal B_s               : signed(8 downto 0);
  signal Y_8bit            : unsigned(7 downto 0);
  signal Cb_8bit           : unsigned(7 downto 0);
  signal Cr_8bit           : unsigned(7 downto 0);
  signal cmp_idx           : unsigned(2 downto 0);
  signal cur_cmp_idx       : unsigned(2 downto 0);
  signal cur_cmp_idx_d1    : unsigned(2 downto 0);
  signal cur_cmp_idx_d2    : unsigned(2 downto 0);
  signal cur_cmp_idx_d3    : unsigned(2 downto 0);
  signal cur_cmp_idx_d4    : unsigned(2 downto 0);
  signal cur_cmp_idx_d5    : unsigned(2 downto 0);
  signal cur_cmp_idx_d6    : unsigned(2 downto 0);
  signal cur_cmp_idx_d7    : unsigned(2 downto 0);
  signal cur_cmp_idx_d8    : unsigned(2 downto 0);
  signal cur_cmp_idx_d9    : unsigned(2 downto 0);
  signal fifo1_rd          : std_logic;
  signal fifo1_wr          : std_logic;
  signal fifo1_q           : std_logic_vector(11 downto 0);
  signal fifo1_full        : std_logic;
  signal fifo1_empty       : std_logic;
  signal fifo1_count       : std_logic_vector(9 downto 0);
  signal fifo1_rd_cnt      : unsigned(5 downto 0);
  signal fifo1_q_dval      : std_logic;
  signal fifo_data_in      : std_logic_vector(11 downto 0);
  signal fifo_rd_arm       : std_logic;
 
  signal eoi_fdct          : std_logic;
  signal bf_fifo_rd_s      : std_logic;
  signal start_int         : std_logic;
  signal start_int_d       : std_logic_vector(4 downto 0);
 
  signal fram1_data        : std_logic_vector(23 downto 0);
  signal fram1_q           : std_logic_vector(23 downto 0);
  signal fram1_we          : std_logic;
  signal fram1_waddr       : std_logic_vector(6 downto 0);
  signal fram1_raddr       : std_logic_vector(6 downto 0);
  signal fram1_rd_d        : std_logic_vector(8 downto 0);
  signal fram1_rd          : std_logic;
  signal rd_started        : std_logic;
  signal writing_en        : std_logic;
  signal fram1_q_vld       : std_logic;
 
  signal fram1_line_cnt    : unsigned(2 downto 0);
  signal fram1_pix_cnt     : unsigned(2 downto 0);
 
 
-------------------------------------------------------------------------------
-- Architecture: begin
-------------------------------------------------------------------------------
begin
 
  zz_data      <= dbuf_q;
 
  bf_fifo_rd   <= bf_fifo_rd_s;
 
  -------------------------------------------------------------------
  -- FRAM1
  -------------------------------------------------------------------
  U_FRAM1 : entity work.RAMZ
  generic map
  (
      RAMADDR_W     => 7,
      RAMDATA_W     => 24
  )
  port map
  (
        d           => fram1_data,
        waddr       => fram1_waddr,
        raddr       => fram1_raddr,
        we          => fram1_we,
        clk         => CLK,
 
        q           => fram1_q
  );
 
  fram1_we   <= bf_dval;
  fram1_data <= bf_fifo_q;
 
  fram1_q_vld <= fram1_rd_d(5);
 
  -------------------------------------------------------------------
  -- FRAM1 process
  -------------------------------------------------------------------
  p_fram1_acc : process(CLK, RST)
  begin
    if RST = '1' then
      fram1_waddr <= (others => '0');
    elsif CLK'event and CLK = '1' then
      if fram1_we = '1' then
        fram1_waddr <= std_logic_vector(unsigned(fram1_waddr) + 1);
      end if;
    end if;
  end process;
 
  -------------------------------------------------------------------
  -- IRAM read process 
  -------------------------------------------------------------------
  p_counter1 : process(CLK, RST)
  begin
    if RST = '1' then
      rd_en           <= '0';
      rd_en_d1        <= '0';
      x_pixel_cnt     <= (others => '0');
      y_line_cnt     <= (others => '0');
      input_rd_cnt    <= (others => '0');
      cmp_idx         <= (others => '0');
      cur_cmp_idx     <= (others => '0');
      cur_cmp_idx_d1  <= (others => '0');
      cur_cmp_idx_d2  <= (others => '0');
      cur_cmp_idx_d3  <= (others => '0');
      cur_cmp_idx_d4  <= (others => '0');
      cur_cmp_idx_d5  <= (others => '0');
      cur_cmp_idx_d6  <= (others => '0');
      cur_cmp_idx_d7  <= (others => '0');
      cur_cmp_idx_d8  <= (others => '0');
      cur_cmp_idx_d9  <= (others => '0');
      eoi_fdct        <= '0';
      start_int       <= '0';
      bf_fifo_rd_s    <= '0';
      bf_dval         <= '0';
      bf_dval_m1      <= '0';
      bf_dval_m2      <= '0';
      fram1_rd        <= '0';
      fram1_rd_d      <= (others => '0');
      start_int_d     <= (others => '0');
      fram1_raddr     <= (others => '0');
      fram1_line_cnt  <= (others => '0');
      fram1_pix_cnt   <= (others => '0');
    elsif CLK'event and CLK = '1' then
      rd_en_d1 <= rd_en;
      cur_cmp_idx_d1 <= cur_cmp_idx;
      cur_cmp_idx_d2 <= cur_cmp_idx_d1;
      cur_cmp_idx_d3 <= cur_cmp_idx_d2;
      cur_cmp_idx_d4 <= cur_cmp_idx_d3;
      cur_cmp_idx_d5 <= cur_cmp_idx_d4;
      cur_cmp_idx_d6 <= cur_cmp_idx_d5;
      cur_cmp_idx_d7 <= cur_cmp_idx_d6;
      cur_cmp_idx_d8 <= cur_cmp_idx_d7;
      cur_cmp_idx_d9 <= cur_cmp_idx_d8;
      start_int      <= '0';
 
      bf_dval_m3     <= bf_fifo_rd_s;
      bf_dval_m2     <= bf_dval_m3;
      bf_dval_m1     <= bf_dval_m2;
      bf_dval        <= bf_dval_m1;
 
      fram1_rd_d     <= fram1_rd_d(fram1_rd_d'length-2 downto 0) & fram1_rd;
      start_int_d    <= start_int_d(start_int_d'length-2 downto 0) & start_int;
 
      -- SOF or internal self-start
      if (sof = '1' or start_int = '1') then
        input_rd_cnt <= (others => '0');
        -- enable BUF_FIFO/FRAM1 reading
        rd_started      <= '1';
 
        -- component index
        if cmp_idx = 4-1 then
          cmp_idx <= (others => '0');
          -- horizontal block counter
          if x_pixel_cnt = unsigned(img_size_x)-16 then
            x_pixel_cnt <= (others => '0');
            -- vertical block counter
            if y_line_cnt = unsigned(img_size_y)-8 then
              y_line_cnt <= (others => '0');
              -- set end of image flag
              eoi_fdct <= '1';
            else
              y_line_cnt <= y_line_cnt + 8;
            end if;
          else
            x_pixel_cnt <= x_pixel_cnt + 16;
          end if;
        else
          cmp_idx <=cmp_idx + 1;
        end if;
 
        cur_cmp_idx     <= cmp_idx;
 
      end if;
 
      -- wait until FIFO becomes half full but only for component 0
      -- as we read buf FIFO only during component 0
      if rd_started = '1' and (bf_fifo_hf_full = '1' or cur_cmp_idx > 1) then
        rd_en      <= '1';
        rd_started <= '0';
      end if;
 
      bf_fifo_rd_s   <= '0';
      fram1_rd       <= '0';
      -- stall reading from input FIFO and writing to output FIFO 
      -- when output FIFO is almost full
      if rd_en = '1' and unsigned(fifo1_count) < 512-64 and
         (bf_fifo_hf_full = '1' or cur_cmp_idx > 1) then
        -- read request goes to BUF_FIFO only for component 0. 
        if cur_cmp_idx < 2 then
          bf_fifo_rd_s <= '1';
        end if;
 
        -- count number of samples read from input in one run
        if input_rd_cnt = 64-1 then
          rd_en        <= '0';
          -- internal restart
          start_int    <= '1' and not eoi_fdct;
          eoi_fdct     <= '0';
        else
          input_rd_cnt <= input_rd_cnt + 1;
        end if;
        -- FRAM read enable
        fram1_rd <= '1';
      end if;
 
      -- increment FRAM1 read address according to subsampling
      -- idea is to extract 8x8 from 16x8 block
      -- there are two luminance blocks left and right
      -- there is 2:1 subsampled Cb block
      -- there is 2:1 subsampled Cr block
      -- subsampling done as simple decimation by 2 wo/ averaging
      if sof = '1' then
        fram1_raddr     <= (others => '0');
        fram1_line_cnt  <= (others => '0');
        fram1_pix_cnt   <= (others => '0');
      elsif start_int_d(4) = '1' then
        fram1_line_cnt  <= (others => '0');
        fram1_pix_cnt   <= (others => '0');
        case cur_cmp_idx_d4 is
          -- Y1, Cr, Cb
          when "000" | "010" | "011" =>
            fram1_raddr <= (others => '0');
          -- Y2
          when "001" =>
            fram1_raddr <= std_logic_vector(to_unsigned(64, fram1_raddr'length));
          when others =>
            null;
        end case;
      elsif fram1_rd_d(4) = '1' then
 
        if fram1_pix_cnt = 8-1 then
          fram1_pix_cnt <= (others => '0');
          if fram1_line_cnt = 8-1 then
            fram1_line_cnt <= (others => '0');
          else
            fram1_line_cnt <= fram1_line_cnt + 1;
          end if;
        else
          fram1_pix_cnt <= fram1_pix_cnt + 1;
        end if;
 
        case cur_cmp_idx_d6 is
          when "000" | "001" =>
            fram1_raddr <= std_logic_vector(unsigned(fram1_raddr) + 1);
          when "010" | "011" =>
            if fram1_pix_cnt = 4-1 then
              fram1_raddr <= std_logic_vector('1' & fram1_line_cnt & "000");
            elsif fram1_pix_cnt = 8-1 then
              if fram1_line_cnt = 8-1 then
                fram1_raddr <= '0' & "000" & "000";
              else
                fram1_raddr <= std_logic_vector('0' & (fram1_line_cnt+1) & "000");
              end if;
            else
              fram1_raddr <= std_logic_vector(unsigned(fram1_raddr) + 2);
            end if;
          when others =>
            null;
        end case;
 
      end if;
 
    end if;
  end process;
 
  -------------------------------------------------------------------
  -- FDCT with input level shift
  -------------------------------------------------------------------
  U_MDCT : entity work.MDCT
        port map
  (
                clk          => CLK,
                rst          => RST,
    dcti         => mdct_data_in,
    idv          => mdct_idval,
    odv          => mdct_odval,
    dcto         => mdct_data_out,
    odv1         => odv1,
    dcto1        => dcto1
        );
 
  mdct_idval   <= fram1_rd_d(8);
 
  R_s <= signed('0' & fram1_q(7 downto 0));
  G_s <= signed('0' & fram1_q(15 downto 8));
  B_s <= signed('0' & fram1_q(23 downto 16));
 
  -------------------------------------------------------------------
  -- Mux1
  -------------------------------------------------------------------
  p_mux1 : process(CLK, RST)
  begin
    if RST = '1' then
      mdct_data_in <= (others => '0');
    elsif CLK'event and CLK = '1' then
      case cur_cmp_idx_d9 is
        when "000" | "001" =>
          mdct_data_in <= std_logic_vector(Y_8bit);
        when "010" =>
          mdct_data_in <= std_logic_vector(Cb_8bit);
        when "011" =>
          mdct_data_in <= std_logic_vector(Cr_8bit);
        when others =>
          null;
      end case;
    end if;
  end process;
 
 
  -------------------------------------------------------------------
  -- FIFO1
  -------------------------------------------------------------------
  U_FIFO1 : entity work.FIFO
  generic map
  (
        DATA_WIDTH        => 12,
        ADDR_WIDTH        => 9
  )
  port map
  (
        rst               => RST,
        clk               => CLK,
        rinc              => fifo1_rd,
        winc              => fifo1_wr,
        datai             => fifo_data_in,
 
        datao             => fifo1_q,
        fullo             => fifo1_full,
        emptyo            => fifo1_empty,
        count             => fifo1_count
  );
 
  fifo1_wr     <= mdct_odval;
  fifo_data_in <= mdct_data_out;
 
 
 
  -------------------------------------------------------------------
  -- FIFO1 rd controller
  -------------------------------------------------------------------
  p_fifo_rd_ctrl : process(CLK, RST)
  begin
    if RST = '1' then
      fifo1_rd     <= '0';
      fifo_rd_arm  <= '0';
      fifo1_rd_cnt <= (others => '0');
      fifo1_q_dval <= '0';
    elsif CLK'event and CLK = '1' then
      fifo1_rd     <= '0';
 
      fifo1_q_dval <= fifo1_rd;
 
      if start_pb = '1' then
        fifo_rd_arm  <= '1';
        fifo1_rd_cnt <= (others => '0');
      end if;
 
      if fifo_rd_arm = '1' then
 
        if fifo1_rd_cnt = 64-1 then
          fifo_rd_arm  <= '0';
          fifo1_rd     <= '1';
        elsif fifo1_empty = '0' then
          fifo1_rd     <= '1';
          fifo1_rd_cnt <= fifo1_rd_cnt + 1;
        end if;
 
      end if;
    end if;
  end process;
 
  -------------------------------------------------------------------
  -- write counter
  -------------------------------------------------------------------
  p_wr_cnt : process(CLK, RST)
  begin
    if RST = '1' then
      wr_cnt   <= (others => '0');
      ready_pb <= '0';
      xw_cnt   <= (others => '0');
      yw_cnt   <= (others => '0');
      writing_en <= '0';
    elsif CLK'event and CLK = '1' then
      ready_pb <= '0';
 
      if start_pb = '1' then
        wr_cnt <= (others => '0');
        xw_cnt <= (others => '0');
        yw_cnt <= (others => '0');
        writing_en  <= '1';
      end if;
 
      if writing_en = '1' then
        if fifo1_q_dval = '1' then
          if wr_cnt = 64-1 then
            wr_cnt <= (others => '0');
            ready_pb <= '1';
            writing_en <= '0';
          else
            wr_cnt <= wr_cnt + 1;
          end if;
 
          if yw_cnt = 8-1 then
            yw_cnt <= (others => '0');
            xw_cnt <= xw_cnt+1;
          else
            yw_cnt <= yw_cnt+1;
          end if;
        end if;
      end if;
    end if;
  end process;
 
  -------------------------------------------------------------------
  -- RGB to YCbCr conversion
  -------------------------------------------------------------------
  p_rgb2ycbcr : process(CLK, RST)
  begin
    if RST = '1' then
      Y_Reg_1  <= (others => '0');
      Y_Reg_2  <= (others => '0');
      Y_Reg_3  <= (others => '0');
      Cb_Reg_1 <= (others => '0');
      Cb_Reg_2 <= (others => '0');
      Cb_Reg_3 <= (others => '0');
      Cr_Reg_1 <= (others => '0');
      Cr_Reg_2 <= (others => '0');
      Cr_Reg_3 <= (others => '0');
      Y_Reg    <= (others => '0');
      Cb_Reg   <= (others => '0');
      Cr_Reg   <= (others => '0');
    elsif CLK'event and CLK = '1' then
      Y_Reg_1  <= R_s*C_Y_1;
      Y_Reg_2  <= G_s*C_Y_2;
      Y_Reg_3  <= B_s*C_Y_3;
 
      Cb_Reg_1 <= R_s*C_Cb_1;
      Cb_Reg_2 <= G_s*C_Cb_2;
      Cb_Reg_3 <= B_s*C_Cb_3;
 
      Cr_Reg_1 <= R_s*C_Cr_1;
      Cr_Reg_2 <= G_s*C_Cr_2;
      Cr_Reg_3 <= B_s*C_Cr_3;
 
      Y_Reg  <= Y_Reg_1 + Y_Reg_2 + Y_Reg_3;
      Cb_Reg <= Cb_Reg_1 + Cb_Reg_2 + Cb_Reg_3 + to_signed(128*16384,Cb_Reg'length);
      Cr_Reg <= Cr_Reg_1 + Cr_Reg_2 + Cr_Reg_3 + to_signed(128*16384,Cr_Reg'length);
 
    end if;
  end process;
 
  Y_8bit  <= unsigned(Y_Reg(21 downto 14));
  Cb_8bit <= unsigned(Cb_Reg(21 downto 14));
  Cr_8bit <= unsigned(Cr_Reg(21 downto 14));
 
 
  -------------------------------------------------------------------
  -- DBUF
  -------------------------------------------------------------------
  U_RAMZ : entity work.RAMZ
  generic map
  (
      RAMADDR_W     => 7,
      RAMDATA_W     => 12
  )
  port map
  (
        d           => dbuf_data,
        waddr       => dbuf_waddr,
        raddr       => dbuf_raddr,
        we          => dbuf_we,
        clk         => CLK,
 
        q           => dbuf_q
  );
 
  dbuf_data  <= fifo1_q;
  dbuf_we    <= fifo1_q_dval;
  dbuf_waddr <= (not zz_buf_sel) & std_logic_vector(yw_cnt & xw_cnt);
  dbuf_raddr <= zz_buf_sel & zz_rd_addr;
 
end architecture RTL;
-------------------------------------------------------------------------------
-- Architecture: end
-------------------------------------------------------------------------------

Line No.	Rev	Author	Line
1	25	mikel262	`-------------------------------------------------------------------------------`
2			`-- File Name : FDCT.vhd`
3			`--`
4			`-- Project : JPEG_ENC`
5			`--`
6			`-- Module : FDCT`
7			`--`
8			`-- Content : FDCT`
9			`--`
10			`-- Description : 2D Discrete Cosine Transform`
11			`--`
12			`-- Spec. :`
13			`--`
14			`-- Author : Michal Krepa`
15			`--`
16			`-------------------------------------------------------------------------------`
17			`-- History :`
18			`-- 20090301: (MK): Initial Creation.`
19			`-------------------------------------------------------------------------------`
20
21			`-------------------------------------------------------------------------------`
22			`-------------------------------------------------------------------------------`
23			`----------------------------------- LIBRARY/PACKAGE ---------------------------`
24			`-------------------------------------------------------------------------------`
25			`-------------------------------------------------------------------------------`
26
27			`-------------------------------------------------------------------------------`
28			`-- generic packages/libraries:`
29			`-------------------------------------------------------------------------------`
30			`library ieee;`
31			`use ieee.std_logic_1164.all;`
32			`use ieee.numeric_std.all;`
33
34			`-------------------------------------------------------------------------------`
35			`-- user packages/libraries:`
36			`-------------------------------------------------------------------------------`
37			`library work;`
38			`use work.JPEG_PKG.all;`
39			`-------------------------------------------------------------------------------`
40			`-------------------------------------------------------------------------------`
41			`----------------------------------- ENTITY ------------------------------------`
42			`-------------------------------------------------------------------------------`
43			`-------------------------------------------------------------------------------`
44			`entity FDCT is`
45			`port`
46			`(`
47			`CLK : in std_logic;`
48			`RST : in std_logic;`
49			`-- CTRL`
50			`start_pb : in std_logic;`
51			`ready_pb : out std_logic;`
52			`fdct_sm_settings : in T_SM_SETTINGS;`
53
54			`-- BUF_FIFO`
55			`bf_fifo_rd : out std_logic;`
56			`bf_fifo_q : in std_logic_vector(23 downto 0);`
57			`bf_fifo_hf_full : in std_logic;`
58
59			`-- ZIG ZAG`
60			`zz_buf_sel : in std_logic;`
61			`zz_rd_addr : in std_logic_vector(5 downto 0);`
62			`zz_data : out std_logic_vector(11 downto 0);`
63			`zz_rden : in std_logic;`
64
65			`-- HOST`
66			`img_size_x : in std_logic_vector(15 downto 0);`
67			`img_size_y : in std_logic_vector(15 downto 0);`
68			`sof : in std_logic`
69			`);`
70			`end entity FDCT;`
71
72			`-------------------------------------------------------------------------------`
73			`-------------------------------------------------------------------------------`
74			`----------------------------------- ARCHITECTURE ------------------------------`
75			`-------------------------------------------------------------------------------`
76			`-------------------------------------------------------------------------------`
77			`architecture RTL of FDCT is`
78
79			`constant C_Y_1 : signed(14 downto 0) := to_signed(4899, 15);`
80			`constant C_Y_2 : signed(14 downto 0) := to_signed(9617, 15);`
81			`constant C_Y_3 : signed(14 downto 0) := to_signed(1868, 15);`
82			`constant C_Cb_1 : signed(14 downto 0) := to_signed(-2764, 15);`
83			`constant C_Cb_2 : signed(14 downto 0) := to_signed(-5428, 15);`
84			`constant C_Cb_3 : signed(14 downto 0) := to_signed(8192, 15);`
85			`constant C_Cr_1 : signed(14 downto 0) := to_signed(8192, 15);`
86			`constant C_Cr_2 : signed(14 downto 0) := to_signed(-6860, 15);`
87			`constant C_Cr_3 : signed(14 downto 0) := to_signed(-1332, 15);`
88
89
90			`signal mdct_data_in : std_logic_vector(7 downto 0);`
91			`signal mdct_idval : std_logic;`
92			`signal mdct_odval : std_logic;`
93			`signal mdct_data_out : std_logic_vector(11 downto 0);`
94			`signal odv1 : std_logic;`
95			`signal dcto1 : std_logic_vector(11 downto 0);`
96	52	mikel262	`signal x_pixel_cnt : unsigned(15 downto 0);`
97			`signal y_line_cnt : unsigned(15 downto 0);`
98	25	mikel262	`signal rd_addr : std_logic_vector(31 downto 0);`
99	61	mikel262	`signal input_rd_cnt : unsigned(6 downto 0);`
100	25	mikel262	`signal rd_en : std_logic;`
101			`signal rd_en_d1 : std_logic;`
102			`signal rdaddr : unsigned(31 downto 0);`
103	52	mikel262	`signal bf_dval : std_logic;`
104			`signal bf_dval_m1 : std_logic;`
105			`signal bf_dval_m2 : std_logic;`
106	56	mikel262	`signal bf_dval_m3 : std_logic;`
107	25	mikel262	`signal wr_cnt : unsigned(5 downto 0);`
108			`signal dbuf_data : std_logic_vector(11 downto 0);`
109			`signal dbuf_q : std_logic_vector(11 downto 0);`
110			`signal dbuf_we : std_logic;`
111			`signal dbuf_waddr : std_logic_vector(6 downto 0);`
112			`signal dbuf_raddr : std_logic_vector(6 downto 0);`
113			`signal xw_cnt : unsigned(2 downto 0);`
114			`signal yw_cnt : unsigned(2 downto 0);`
115
116			`signal dbuf_q_z1 : std_logic_vector(11 downto 0);`
117			`constant C_SIMA_ASZ : integer := 9;`
118			`signal sim_rd_addr : unsigned(C_SIMA_ASZ-1 downto 0);`
119			`signal Y_reg_1 : signed(23 downto 0);`
120			`signal Y_reg_2 : signed(23 downto 0);`
121			`signal Y_reg_3 : signed(23 downto 0);`
122			`signal Cb_reg_1 : signed(23 downto 0);`
123			`signal Cb_reg_2 : signed(23 downto 0);`
124			`signal Cb_reg_3 : signed(23 downto 0);`
125			`signal Cr_reg_1 : signed(23 downto 0);`
126			`signal Cr_reg_2 : signed(23 downto 0);`
127			`signal Cr_reg_3 : signed(23 downto 0);`
128			`signal Y_reg : signed(23 downto 0);`
129			`signal Cb_reg : signed(23 downto 0);`
130			`signal Cr_reg : signed(23 downto 0);`
131			`signal R_s : signed(8 downto 0);`
132			`signal G_s : signed(8 downto 0);`
133			`signal B_s : signed(8 downto 0);`
134			`signal Y_8bit : unsigned(7 downto 0);`
135			`signal Cb_8bit : unsigned(7 downto 0);`
136			`signal Cr_8bit : unsigned(7 downto 0);`
137	61	mikel262	`signal cmp_idx : unsigned(2 downto 0);`
138			`signal cur_cmp_idx : unsigned(2 downto 0);`
139			`signal cur_cmp_idx_d1 : unsigned(2 downto 0);`
140			`signal cur_cmp_idx_d2 : unsigned(2 downto 0);`
141			`signal cur_cmp_idx_d3 : unsigned(2 downto 0);`
142			`signal cur_cmp_idx_d4 : unsigned(2 downto 0);`
143			`signal cur_cmp_idx_d5 : unsigned(2 downto 0);`
144			`signal cur_cmp_idx_d6 : unsigned(2 downto 0);`
145			`signal cur_cmp_idx_d7 : unsigned(2 downto 0);`
146			`signal cur_cmp_idx_d8 : unsigned(2 downto 0);`
147			`signal cur_cmp_idx_d9 : unsigned(2 downto 0);`
148	25	mikel262	`signal fifo1_rd : std_logic;`
149			`signal fifo1_wr : std_logic;`
150			`signal fifo1_q : std_logic_vector(11 downto 0);`
151			`signal fifo1_full : std_logic;`
152			`signal fifo1_empty : std_logic;`
153	61	mikel262	`signal fifo1_count : std_logic_vector(9 downto 0);`
154	25	mikel262	`signal fifo1_rd_cnt : unsigned(5 downto 0);`
155			`signal fifo1_q_dval : std_logic;`
156			`signal fifo_data_in : std_logic_vector(11 downto 0);`
157			`signal fifo_rd_arm : std_logic;`
158
159			`signal eoi_fdct : std_logic;`
160	61	mikel262	`signal bf_fifo_rd_s : std_logic;`
161	25	mikel262	`signal start_int : std_logic;`
162	61	mikel262	`signal start_int_d : std_logic_vector(4 downto 0);`
163	25	mikel262
164			`signal fram1_data : std_logic_vector(23 downto 0);`
165			`signal fram1_q : std_logic_vector(23 downto 0);`
166			`signal fram1_we : std_logic;`
167	61	mikel262	`signal fram1_waddr : std_logic_vector(6 downto 0);`
168			`signal fram1_raddr : std_logic_vector(6 downto 0);`
169	28	mikel262	`signal fram1_rd_d : std_logic_vector(8 downto 0);`
170	25	mikel262	`signal fram1_rd : std_logic;`
171			`signal rd_started : std_logic;`
172			`signal writing_en : std_logic;`
173	61	mikel262	`signal fram1_q_vld : std_logic;`
174	25	mikel262
175	61	mikel262	`signal fram1_line_cnt : unsigned(2 downto 0);`
176			`signal fram1_pix_cnt : unsigned(2 downto 0);`
177
178
179	25	mikel262	`-------------------------------------------------------------------------------`
180			`-- Architecture: begin`
181			`-------------------------------------------------------------------------------`
182			`begin`
183
184			`zz_data <= dbuf_q;`
185
186			`bf_fifo_rd <= bf_fifo_rd_s;`
187
188			`-------------------------------------------------------------------`
189			`-- FRAM1`
190			`-------------------------------------------------------------------`
191			`U_FRAM1 : entity work.RAMZ`
192			`generic map`
193			`(`
194	61	mikel262	`RAMADDR_W => 7,`
195	25	mikel262	`RAMDATA_W => 24`
196			`)`
197			`port map`
198			`(`
199			`d => fram1_data,`
200			`waddr => fram1_waddr,`
201			`raddr => fram1_raddr,`
202			`we => fram1_we,`
203			`clk => CLK,`
204
205			`q => fram1_q`
206			`);`
207
208	52	mikel262	`fram1_we <= bf_dval;`
209	25	mikel262	`fram1_data <= bf_fifo_q;`
210
211	61	mikel262	`fram1_q_vld <= fram1_rd_d(5);`
212
213	25	mikel262	`-------------------------------------------------------------------`
214			`-- FRAM1 process`
215			`-------------------------------------------------------------------`
216			`p_fram1_acc : process(CLK, RST)`
217			`begin`
218			`if RST = '1' then`
219			`fram1_waddr <= (others => '0');`
220			`elsif CLK'event and CLK = '1' then`
221			`if fram1_we = '1' then`
222			`fram1_waddr <= std_logic_vector(unsigned(fram1_waddr) + 1);`
223			`end if;`
224			`end if;`
225			`end process;`
226
227			`-------------------------------------------------------------------`
228			`-- IRAM read process`
229			`-------------------------------------------------------------------`
230			`p_counter1 : process(CLK, RST)`
231			`begin`
232			`if RST = '1' then`
233			`rd_en <= '0';`
234			`rd_en_d1 <= '0';`
235	52	mikel262	`x_pixel_cnt <= (others => '0');`
236			`y_line_cnt <= (others => '0');`
237	25	mikel262	`input_rd_cnt <= (others => '0');`
238			`cmp_idx <= (others => '0');`
239			`cur_cmp_idx <= (others => '0');`
240			`cur_cmp_idx_d1 <= (others => '0');`
241			`cur_cmp_idx_d2 <= (others => '0');`
242			`cur_cmp_idx_d3 <= (others => '0');`
243			`cur_cmp_idx_d4 <= (others => '0');`
244			`cur_cmp_idx_d5 <= (others => '0');`
245			`cur_cmp_idx_d6 <= (others => '0');`
246			`cur_cmp_idx_d7 <= (others => '0');`
247			`cur_cmp_idx_d8 <= (others => '0');`
248			`cur_cmp_idx_d9 <= (others => '0');`
249			`eoi_fdct <= '0';`
250			`start_int <= '0';`
251			`bf_fifo_rd_s <= '0';`
252	52	mikel262	`bf_dval <= '0';`
253			`bf_dval_m1 <= '0';`
254			`bf_dval_m2 <= '0';`
255	25	mikel262	`fram1_rd <= '0';`
256			`fram1_rd_d <= (others => '0');`
257	61	mikel262	`start_int_d <= (others => '0');`
258	25	mikel262	`fram1_raddr <= (others => '0');`
259	61	mikel262	`fram1_line_cnt <= (others => '0');`
260			`fram1_pix_cnt <= (others => '0');`
261	25	mikel262	`elsif CLK'event and CLK = '1' then`
262			`rd_en_d1 <= rd_en;`
263			`cur_cmp_idx_d1 <= cur_cmp_idx;`
264			`cur_cmp_idx_d2 <= cur_cmp_idx_d1;`
265			`cur_cmp_idx_d3 <= cur_cmp_idx_d2;`
266			`cur_cmp_idx_d4 <= cur_cmp_idx_d3;`
267			`cur_cmp_idx_d5 <= cur_cmp_idx_d4;`
268			`cur_cmp_idx_d6 <= cur_cmp_idx_d5;`
269			`cur_cmp_idx_d7 <= cur_cmp_idx_d6;`
270			`cur_cmp_idx_d8 <= cur_cmp_idx_d7;`
271			`cur_cmp_idx_d9 <= cur_cmp_idx_d8;`
272			`start_int <= '0';`
273
274	56	mikel262	`bf_dval_m3 <= bf_fifo_rd_s;`
275			`bf_dval_m2 <= bf_dval_m3;`
276	52	mikel262	`bf_dval_m1 <= bf_dval_m2;`
277			`bf_dval <= bf_dval_m1;`
278	56	mikel262
279	25	mikel262	`fram1_rd_d <= fram1_rd_d(fram1_rd_d'length-2 downto 0) & fram1_rd;`
280	61	mikel262	`start_int_d <= start_int_d(start_int_d'length-2 downto 0) & start_int;`
281	25	mikel262
282			`-- SOF or internal self-start`
283			`if (sof = '1' or start_int = '1') then`
284			`input_rd_cnt <= (others => '0');`
285			`-- enable BUF_FIFO/FRAM1 reading`
286	61	mikel262	`rd_started <= '1';`
287	25	mikel262
288			`-- component index`
289	61	mikel262	`if cmp_idx = 4-1 then`
290	25	mikel262	`cmp_idx <= (others => '0');`
291			`-- horizontal block counter`
292	61	mikel262	`if x_pixel_cnt = unsigned(img_size_x)-16 then`
293	52	mikel262	`x_pixel_cnt <= (others => '0');`
294	25	mikel262	`-- vertical block counter`
295	52	mikel262	`if y_line_cnt = unsigned(img_size_y)-8 then`
296			`y_line_cnt <= (others => '0');`
297			`-- set end of image flag`
298	25	mikel262	`eoi_fdct <= '1';`
299			`else`
300	52	mikel262	`y_line_cnt <= y_line_cnt + 8;`
301	25	mikel262	`end if;`
302			`else`
303	61	mikel262	`x_pixel_cnt <= x_pixel_cnt + 16;`
304	25	mikel262	`end if;`
305			`else`
306			`cmp_idx <=cmp_idx + 1;`
307			`end if;`
308
309			`cur_cmp_idx <= cmp_idx;`
310	61	mikel262
311	25	mikel262	`end if;`
312
313	52	mikel262	`-- wait until FIFO becomes half full but only for component 0`
314			`-- as we read buf FIFO only during component 0`
315	61	mikel262	`if rd_started = '1' and (bf_fifo_hf_full = '1' or cur_cmp_idx > 1) then`
316	25	mikel262	`rd_en <= '1';`
317			`rd_started <= '0';`
318			`end if;`
319
320			`bf_fifo_rd_s <= '0';`
321			`fram1_rd <= '0';`
322			`-- stall reading from input FIFO and writing to output FIFO`
323			`-- when output FIFO is almost full`
324	61	mikel262	`if rd_en = '1' and unsigned(fifo1_count) < 512-64 and`
325			`(bf_fifo_hf_full = '1' or cur_cmp_idx > 1) then`
326	25	mikel262	`-- read request goes to BUF_FIFO only for component 0.`
327	61	mikel262	`if cur_cmp_idx < 2 then`
328	25	mikel262	`bf_fifo_rd_s <= '1';`
329			`end if;`
330
331			`-- count number of samples read from input in one run`
332			`if input_rd_cnt = 64-1 then`
333			`rd_en <= '0';`
334	52	mikel262	`-- internal restart`
335	25	mikel262	`start_int <= '1' and not eoi_fdct;`
336			`eoi_fdct <= '0';`
337			`else`
338			`input_rd_cnt <= input_rd_cnt + 1;`
339			`end if;`
340			`-- FRAM read enable`
341			`fram1_rd <= '1';`
342			`end if;`
343
344	61	mikel262	`-- increment FRAM1 read address according to subsampling`
345			`-- idea is to extract 8x8 from 16x8 block`
346			`-- there are two luminance blocks left and right`
347			`-- there is 2:1 subsampled Cb block`
348			`-- there is 2:1 subsampled Cr block`
349			`-- subsampling done as simple decimation by 2 wo/ averaging`
350			`if sof = '1' then`
351			`fram1_raddr <= (others => '0');`
352			`fram1_line_cnt <= (others => '0');`
353			`fram1_pix_cnt <= (others => '0');`
354			`elsif start_int_d(4) = '1' then`
355			`fram1_line_cnt <= (others => '0');`
356			`fram1_pix_cnt <= (others => '0');`
357			`case cur_cmp_idx_d4 is`
358			`-- Y1, Cr, Cb`
359			`when "000" \| "010" \| "011" =>`
360			`fram1_raddr <= (others => '0');`
361			`-- Y2`
362			`when "001" =>`
363			`fram1_raddr <= std_logic_vector(to_unsigned(64, fram1_raddr'length));`
364			`when others =>`
365			`null;`
366			`end case;`
367			`elsif fram1_rd_d(4) = '1' then`
368
369			`if fram1_pix_cnt = 8-1 then`
370			`fram1_pix_cnt <= (others => '0');`
371			`if fram1_line_cnt = 8-1 then`
372			`fram1_line_cnt <= (others => '0');`
373			`else`
374			`fram1_line_cnt <= fram1_line_cnt + 1;`
375			`end if;`
376			`else`
377			`fram1_pix_cnt <= fram1_pix_cnt + 1;`
378			`end if;`
379
380			`case cur_cmp_idx_d6 is`
381			`when "000" \| "001" =>`
382			`fram1_raddr <= std_logic_vector(unsigned(fram1_raddr) + 1);`
383			`when "010" \| "011" =>`
384			`if fram1_pix_cnt = 4-1 then`
385			`fram1_raddr <= std_logic_vector('1' & fram1_line_cnt & "000");`
386			`elsif fram1_pix_cnt = 8-1 then`
387			`if fram1_line_cnt = 8-1 then`
388			`fram1_raddr <= '0' & "000" & "000";`
389			`else`
390			`fram1_raddr <= std_logic_vector('0' & (fram1_line_cnt+1) & "000");`
391			`end if;`
392			`else`
393			`fram1_raddr <= std_logic_vector(unsigned(fram1_raddr) + 2);`
394			`end if;`
395			`when others =>`
396			`null;`
397			`end case;`
398
399	25	mikel262	`end if;`
400
401			`end if;`
402			`end process;`
403
404			`-------------------------------------------------------------------`
405			`-- FDCT with input level shift`
406			`-------------------------------------------------------------------`
407			`U_MDCT : entity work.MDCT`
408			`port map`
409			`(`
410			`clk => CLK,`
411			`rst => RST,`
412			`dcti => mdct_data_in,`
413			`idv => mdct_idval,`
414			`odv => mdct_odval,`
415			`dcto => mdct_data_out,`
416			`odv1 => odv1,`
417			`dcto1 => dcto1`
418			`);`
419
420	28	mikel262	`mdct_idval <= fram1_rd_d(8);`
421	25	mikel262
422			`R_s <= signed('0' & fram1_q(7 downto 0));`
423			`G_s <= signed('0' & fram1_q(15 downto 8));`
424			`B_s <= signed('0' & fram1_q(23 downto 16));`
425
426			`-------------------------------------------------------------------`
427			`-- Mux1`
428			`-------------------------------------------------------------------`
429			`p_mux1 : process(CLK, RST)`
430			`begin`
431			`if RST = '1' then`
432			`mdct_data_in <= (others => '0');`
433			`elsif CLK'event and CLK = '1' then`
434			`case cur_cmp_idx_d9 is`
435	61	mikel262	`when "000" \| "001" =>`
436	25	mikel262	`mdct_data_in <= std_logic_vector(Y_8bit);`
437	61	mikel262	`when "010" =>`
438	25	mikel262	`mdct_data_in <= std_logic_vector(Cb_8bit);`
439	61	mikel262	`when "011" =>`
440	25	mikel262	`mdct_data_in <= std_logic_vector(Cr_8bit);`
441			`when others =>`
442			`null;`
443			`end case;`
444			`end if;`
445			`end process;`
446
447
448			`-------------------------------------------------------------------`
449			`-- FIFO1`
450			`-------------------------------------------------------------------`
451			`U_FIFO1 : entity work.FIFO`
452			`generic map`
453			`(`
454			`DATA_WIDTH => 12,`
455	61	mikel262	`ADDR_WIDTH => 9`
456	25	mikel262	`)`
457			`port map`
458			`(`
459			`rst => RST,`
460			`clk => CLK,`
461			`rinc => fifo1_rd,`
462			`winc => fifo1_wr,`
463			`datai => fifo_data_in,`
464
465			`datao => fifo1_q,`
466			`fullo => fifo1_full,`
467			`emptyo => fifo1_empty,`
468			`count => fifo1_count`
469			`);`
470
471			`fifo1_wr <= mdct_odval;`
472			`fifo_data_in <= mdct_data_out;`
473
474
475
476			`-------------------------------------------------------------------`
477	52	mikel262	`-- FIFO1 rd controller`
478	25	mikel262	`-------------------------------------------------------------------`
479			`p_fifo_rd_ctrl : process(CLK, RST)`
480			`begin`
481			`if RST = '1' then`
482			`fifo1_rd <= '0';`
483			`fifo_rd_arm <= '0';`
484			`fifo1_rd_cnt <= (others => '0');`
485			`fifo1_q_dval <= '0';`
486			`elsif CLK'event and CLK = '1' then`
487			`fifo1_rd <= '0';`
488
489			`fifo1_q_dval <= fifo1_rd;`
490
491			`if start_pb = '1' then`
492			`fifo_rd_arm <= '1';`
493			`fifo1_rd_cnt <= (others => '0');`
494			`end if;`
495
496			`if fifo_rd_arm = '1' then`
497
498			`if fifo1_rd_cnt = 64-1 then`
499			`fifo_rd_arm <= '0';`
500			`fifo1_rd <= '1';`

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