URL https://opencores.org/ocsvn/mkjpeg/mkjpeg/trunk

Subversion Repositories mkjpeg

[/] [mkjpeg/] [trunk/] [design/] [mdct/] [DCT2D.VHD] - Blame information for rev 32

Go to most recent revision | Details | Compare with Previous | View Log


--------------------------------------------------------------------------------
--                                                                            --
--                          V H D L    F I L E                                --
--                          COPYRIGHT (C) 2006                                --
--                                                                            --
--------------------------------------------------------------------------------
--
-- Title       : DCT2D
-- Design      : MDCT Core
-- Author      : Michal Krepa
--
--------------------------------------------------------------------------------
--
-- File        : DCT2D.VHD
-- Created     : Sat Mar 28 22:32 2006
--
--------------------------------------------------------------------------------
--
--  Description : 1D Discrete Cosine Transform (second stage)
--
--------------------------------------------------------------------------------
 
 
library IEEE;
  use IEEE.STD_LOGIC_1164.all;
  use ieee.numeric_std.all;
 
library WORK;
  use WORK.MDCT_PKG.all;
 
entity DCT2D is
        port(
      clk          : in STD_LOGIC;
      rst          : in std_logic;
      romedatao    : in T_ROM2DATAO;
      romodatao    : in T_ROM2DATAO;
      ramdatao     : in STD_LOGIC_VECTOR(RAMDATA_W-1 downto 0);
      dataready    : in STD_LOGIC;
 
      odv          : out STD_LOGIC;
      dcto         : out std_logic_vector(OP_W-1 downto 0);
      romeaddro    : out T_ROM2ADDRO;
      romoaddro    : out T_ROM2ADDRO;
      ramraddro    : out STD_LOGIC_VECTOR(RAMADRR_W-1 downto 0);
      rmemsel      : out STD_LOGIC;
      datareadyack : out STD_LOGIC
 
                );
end DCT2D;
 
architecture RTL of DCT2D is
 
  type input_data2 is array (N-1 downto 0) of SIGNED(RAMDATA_W downto 0);
 
  signal databuf_reg     : input_data2;
  signal latchbuf_reg    : input_data2;
  signal col_reg         : UNSIGNED(RAMADRR_W/2-1 downto 0);
  signal row_reg         : UNSIGNED(RAMADRR_W/2-1 downto 0);
  signal colram_reg      : UNSIGNED(RAMADRR_W/2-1 downto 0);
  signal rowram_reg      : UNSIGNED(RAMADRR_W/2-1 downto 0);
  signal colr_reg        : UNSIGNED(RAMADRR_W/2-1 downto 0);
  signal rowr_reg        : UNSIGNED(RAMADRR_W/2-1 downto 0);
  signal rmemsel_reg     : STD_LOGIC;
  signal stage1_reg      : STD_LOGIC;
  signal stage2_reg      : STD_LOGIC;
  signal stage2_cnt_reg  : UNSIGNED(RAMADRR_W-1 downto 0);
  signal dataready_2_reg : STD_LOGIC;
  signal even_not_odd    : std_logic;
  signal even_not_odd_d1 : std_logic;
  signal even_not_odd_d2 : std_logic;
  signal even_not_odd_d3 : std_logic;
  signal even_not_odd_d4 : std_logic;
  signal odv_d0          : std_logic;
  signal odv_d1          : std_logic;
  signal odv_d2          : std_logic;
  signal odv_d3          : std_logic;
  signal odv_d4          : std_logic;
  signal odv_d5          : std_logic;
  signal dcto_1          : std_logic_vector(DA2_W-1 downto 0);
  signal dcto_2          : std_logic_vector(DA2_W-1 downto 0);
  signal dcto_3          : std_logic_vector(DA2_W-1 downto 0);
  signal dcto_4          : std_logic_vector(DA2_W-1 downto 0);
  signal dcto_5          : std_logic_vector(DA2_W-1 downto 0);
  signal romedatao_d1    : T_ROM2DATAO;
  signal romodatao_d1    : T_ROM2DATAO;
  signal romedatao_d2    : T_ROM2DATAO;
  signal romodatao_d2    : T_ROM2DATAO;
  signal romedatao_d3    : T_ROM2DATAO;
  signal romodatao_d3    : T_ROM2DATAO;
  signal romedatao_d4    : T_ROM2DATAO;
  signal romodatao_d4    : T_ROM2DATAO;
begin
 
  ramraddro_sg:
  ramraddro  <= STD_LOGIC_VECTOR(rowr_reg & colr_reg);
 
  rmemsel_sg:
  rmemsel    <= rmemsel_reg;
 
  process(clk,rst)
  begin
    if rst = '1' then
      stage2_cnt_reg       <= (others => '1');
      rmemsel_reg          <= '0';
      stage1_reg           <= '0';
      stage2_reg           <= '0';
      colram_reg           <= (others => '0');
      rowram_reg           <= (others => '0');
      col_reg              <= (others => '0');
      row_reg              <= (others => '0');
      latchbuf_reg         <= (others => (others => '0'));
      databuf_reg          <= (others => (others => '0'));
      odv_d0               <= '0';
      colr_reg             <= (others => '0');
      rowr_reg             <= (others => '0');
      dataready_2_reg      <= '0';
    elsif clk='1' and clk'event then
      stage2_reg    <= '0';
      odv_d0        <= '0';
      datareadyack  <= '0';
      dataready_2_reg <= dataready;
 
      ----------------------------------
      -- read DCT 1D to barrel shifer
      ----------------------------------
      if stage1_reg = '1' then
 
        -- right shift input data
        latchbuf_reg(N-2 downto 0) <= latchbuf_reg(N-1 downto 1);
        latchbuf_reg(N-1)          <= RESIZE(SIGNED(ramdatao),RAMDATA_W+1);
 
        colram_reg  <= colram_reg + 1;
        colr_reg    <= colr_reg + 1;
 
        if colram_reg = N-2 then
          rowr_reg <= rowr_reg + 1;
        end if;
 
        if colram_reg = N-1 then
          rowram_reg <= rowram_reg + 1;
          if rowram_reg = N-1 then
            stage1_reg    <= '0';
            colr_reg      <= (others => '0');
            -- release memory
            rmemsel_reg    <= not rmemsel_reg;
          end if;
 
          -- after this sum databuf_reg is in range of -256 to 254 (min to max)
          databuf_reg(0)  <= latchbuf_reg(1)+RESIZE(SIGNED(ramdatao),RAMDATA_W+1);
          databuf_reg(1)  <= latchbuf_reg(2)+latchbuf_reg(7);
          databuf_reg(2)  <= latchbuf_reg(3)+latchbuf_reg(6);
          databuf_reg(3)  <= latchbuf_reg(4)+latchbuf_reg(5);
          databuf_reg(4)  <= latchbuf_reg(1)-RESIZE(SIGNED(ramdatao),RAMDATA_W+1);
          databuf_reg(5)  <= latchbuf_reg(2)-latchbuf_reg(7);
          databuf_reg(6)  <= latchbuf_reg(3)-latchbuf_reg(6);
          databuf_reg(7)  <= latchbuf_reg(4)-latchbuf_reg(5);
 
          -- 8 point input latched
          stage2_reg      <= '1';
        end if;
      end if;
 
      --------------------------------
      -- 2nd stage
      --------------------------------
      if stage2_cnt_reg < N then
        stage2_cnt_reg <= stage2_cnt_reg + 1;
 
        -- output data valid
        odv_d0    <= '1';
 
        -- increment column counter
        col_reg   <= col_reg + 1;
 
        -- finished processing one input row
        if col_reg = N - 1 then
          row_reg         <= row_reg + 1;
        end if;
      end if;
 
      if stage2_reg = '1' then
        stage2_cnt_reg <= (others => '0');
        col_reg        <= (0=>'1',others => '0');
      end if;
      --------------------------------
 
      ----------------------------------
      -- wait for new data
      ----------------------------------
      -- one of ram buffers has new data, process it
      if dataready = '1' and dataready_2_reg = '0'  then
        stage1_reg    <= '1';
        -- to account for 1T RAM delay, increment RAM address counter
        colram_reg    <= (others => '0');
        colr_reg      <= (0=>'1',others => '0');
        datareadyack  <= '1';
      end if;
      ----------------------------------
 
 
    end if;
  end process;
 
  p_data_pipe : process(CLK, RST)
  begin
    if RST = '1' then
      even_not_odd         <= '0';
      even_not_odd_d1      <= '0';
      even_not_odd_d2      <= '0';
      even_not_odd_d3      <= '0';
      even_not_odd_d4      <= '0';
      odv_d1               <= '0';
      odv_d2               <= '0';
      odv_d3               <= '0';
      odv_d4               <= '0';
      odv_d5               <= '0';
      dcto_1               <= (others => '0');
      dcto_2               <= (others => '0');
      dcto_3               <= (others => '0');
      dcto_4               <= (others => '0');
      dcto_5               <= (others => '0');
    elsif CLK'event and CLK = '1' then
      even_not_odd    <= stage2_cnt_reg(0);
      even_not_odd_d1 <= even_not_odd;
      even_not_odd_d2 <= even_not_odd_d1;
      even_not_odd_d3 <= even_not_odd_d2;
      even_not_odd_d4 <= even_not_odd_d3;
      odv_d1          <= odv_d0;
      odv_d2          <= odv_d1;
      odv_d3          <= odv_d2;
      odv_d4          <= odv_d3;
      odv_d5          <= odv_d4;
 
      if even_not_odd = '0' then
        dcto_1 <= STD_LOGIC_VECTOR(RESIZE
          (RESIZE(SIGNED(romedatao(0)),DA2_W) +
          (RESIZE(SIGNED(romedatao(1)),DA2_W-1) & '0') +
          (RESIZE(SIGNED(romedatao(2)),DA2_W-2) & "00"),
          DA2_W));
      else
        dcto_1 <= STD_LOGIC_VECTOR(RESIZE
          (RESIZE(SIGNED(romodatao(0)),DA2_W) +
          (RESIZE(SIGNED(romodatao(1)),DA2_W-1) & '0') +
          (RESIZE(SIGNED(romodatao(2)),DA2_W-2) & "00"),
          DA2_W));
      end if;
 
      if even_not_odd_d1 = '0' then
        dcto_2 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_1) +
          (RESIZE(SIGNED(romedatao_d1(3)),DA2_W-3) & "000") +
          (RESIZE(SIGNED(romedatao_d1(4)),DA2_W-4) & "0000"),
          DA2_W));
      else
        dcto_2 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_1) +
          (RESIZE(SIGNED(romodatao_d1(3)),DA2_W-3) & "000") +
          (RESIZE(SIGNED(romodatao_d1(4)),DA2_W-4) & "0000"),
          DA2_W));
      end if;
 
      if even_not_odd_d2 = '0' then
        dcto_3 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_2) +
          (RESIZE(SIGNED(romedatao_d2(5)),DA2_W-5) & "00000") +
          (RESIZE(SIGNED(romedatao_d2(6)),DA2_W-6) & "000000"),
          DA2_W));
      else
        dcto_3 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_2) +
          (RESIZE(SIGNED(romodatao_d2(5)),DA2_W-5) & "00000") +
          (RESIZE(SIGNED(romodatao_d2(6)),DA2_W-6) & "000000"),
          DA2_W));
      end if;
 
      if even_not_odd_d3 = '0' then
        dcto_4 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_3) +
          (RESIZE(SIGNED(romedatao_d3(7)),DA2_W-7) & "0000000") +
          (RESIZE(SIGNED(romedatao_d3(8)),DA2_W-8) & "00000000"),
          DA2_W));
      else
        dcto_4 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_3) +
          (RESIZE(SIGNED(romodatao_d3(7)),DA2_W-7) & "0000000") +
          (RESIZE(SIGNED(romodatao_d3(8)),DA2_W-8) & "00000000"),
          DA2_W));
      end if;
 
      if even_not_odd_d4 = '0' then
        dcto_5 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_4) +
          (RESIZE(SIGNED(romedatao_d4(9)),DA2_W-9) & "000000000") -
          (RESIZE(SIGNED(romedatao_d4(10)),DA2_W-10) & "0000000000"),
          DA2_W));
      else
        dcto_5 <= STD_LOGIC_VECTOR(RESIZE
          (signed(dcto_4) +
          (RESIZE(SIGNED(romodatao_d4(9)),DA2_W-9) & "000000000") -
          (RESIZE(SIGNED(romodatao_d4(10)),DA2_W-10) & "0000000000"),
          DA2_W));
      end if;
    end if;
  end process;
 
  dcto <= dcto_5(DA2_W-1 downto 12);
  odv  <= odv_d5;
 
  p_romaddr : process(CLK, RST)
  begin
    if RST = '1' then
      romeaddro   <= (others => (others => '0'));
      romoaddro   <= (others => (others => '0'));
    elsif CLK'event and CLK = '1' then
      for i in 0 to 10 loop
        -- read precomputed MAC results from LUT
        romeaddro(i) <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
                 databuf_reg(0)(i) &
                 databuf_reg(1)(i) &
                 databuf_reg(2)(i) &
                 databuf_reg(3)(i);
        -- odd
        romoaddro(i) <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
                 databuf_reg(4)(i) &
                 databuf_reg(5)(i) &
                 databuf_reg(6)(i) &
                 databuf_reg(7)(i);
      end loop;
    end if;
  end process;
 
  p_romdatao_dly : process(CLK, RST)
  begin
    if RST = '1' then
      romedatao_d1    <= (others => (others => '0'));
      romodatao_d1    <= (others => (others => '0'));
      romedatao_d2    <= (others => (others => '0'));
      romodatao_d2    <= (others => (others => '0'));
      romedatao_d3    <= (others => (others => '0'));
      romodatao_d3    <= (others => (others => '0'));
      romedatao_d4    <= (others => (others => '0'));
      romodatao_d4    <= (others => (others => '0'));
    elsif CLK'event and CLK = '1' then
      romedatao_d1   <= romedatao;
      romodatao_d1   <= romodatao;
      romedatao_d2   <= romedatao_d1;
      romodatao_d2   <= romodatao_d1;
      romedatao_d3   <= romedatao_d2;
      romodatao_d3   <= romodatao_d2;
      romedatao_d4   <= romedatao_d3;
      romodatao_d4   <= romodatao_d3;
    end if;
  end process;
 
end RTL;
--------------------------------------------------------------------------------
 

Browse

Tools

Subversion Repositories mkjpeg

[/] [mkjpeg/] [trunk/] [design/] [mdct/] [DCT2D.VHD] - Blame information for rev 32

Line No.	Rev	Author	Line
1	25	mikel262	`--------------------------------------------------------------------------------`
2			`-- --`
3			`-- V H D L F I L E --`
4			`-- COPYRIGHT (C) 2006 --`
5			`-- --`
6			`--------------------------------------------------------------------------------`
7			`--`
8			`-- Title : DCT2D`
9			`-- Design : MDCT Core`
10			`-- Author : Michal Krepa`
11			`--`
12			`--------------------------------------------------------------------------------`
13			`--`
14			`-- File : DCT2D.VHD`
15			`-- Created : Sat Mar 28 22:32 2006`
16			`--`
17			`--------------------------------------------------------------------------------`
18			`--`
19			`-- Description : 1D Discrete Cosine Transform (second stage)`
20			`--`
21			`--------------------------------------------------------------------------------`
22
23
24			`library IEEE;`
25			`use IEEE.STD_LOGIC_1164.all;`
26			`use ieee.numeric_std.all;`
27
28			`library WORK;`
29			`use WORK.MDCT_PKG.all;`
30
31			`entity DCT2D is`
32			`port(`
33			`clk : in STD_LOGIC;`
34			`rst : in std_logic;`
35			`romedatao : in T_ROM2DATAO;`
36			`romodatao : in T_ROM2DATAO;`
37			`ramdatao : in STD_LOGIC_VECTOR(RAMDATA_W-1 downto 0);`
38			`dataready : in STD_LOGIC;`
39
40			`odv : out STD_LOGIC;`
41			`dcto : out std_logic_vector(OP_W-1 downto 0);`
42			`romeaddro : out T_ROM2ADDRO;`
43			`romoaddro : out T_ROM2ADDRO;`
44			`ramraddro : out STD_LOGIC_VECTOR(RAMADRR_W-1 downto 0);`
45			`rmemsel : out STD_LOGIC;`
46			`datareadyack : out STD_LOGIC`
47
48			`);`
49			`end DCT2D;`
50
51			`architecture RTL of DCT2D is`
52
53			`type input_data2 is array (N-1 downto 0) of SIGNED(RAMDATA_W downto 0);`
54
55			`signal databuf_reg : input_data2;`
56			`signal latchbuf_reg : input_data2;`
57			`signal col_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);`
58			`signal row_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);`
59			`signal colram_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);`
60			`signal rowram_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);`
61			`signal colr_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);`
62			`signal rowr_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);`
63			`signal rmemsel_reg : STD_LOGIC;`
64			`signal stage1_reg : STD_LOGIC;`
65			`signal stage2_reg : STD_LOGIC;`
66			`signal stage2_cnt_reg : UNSIGNED(RAMADRR_W-1 downto 0);`
67			`signal dataready_2_reg : STD_LOGIC;`
68			`signal even_not_odd : std_logic;`
69			`signal even_not_odd_d1 : std_logic;`
70			`signal even_not_odd_d2 : std_logic;`
71			`signal even_not_odd_d3 : std_logic;`
72			`signal even_not_odd_d4 : std_logic;`
73			`signal odv_d0 : std_logic;`
74			`signal odv_d1 : std_logic;`
75			`signal odv_d2 : std_logic;`
76			`signal odv_d3 : std_logic;`
77			`signal odv_d4 : std_logic;`
78			`signal odv_d5 : std_logic;`
79			`signal dcto_1 : std_logic_vector(DA2_W-1 downto 0);`
80			`signal dcto_2 : std_logic_vector(DA2_W-1 downto 0);`
81			`signal dcto_3 : std_logic_vector(DA2_W-1 downto 0);`
82			`signal dcto_4 : std_logic_vector(DA2_W-1 downto 0);`
83			`signal dcto_5 : std_logic_vector(DA2_W-1 downto 0);`
84			`signal romedatao_d1 : T_ROM2DATAO;`
85			`signal romodatao_d1 : T_ROM2DATAO;`
86			`signal romedatao_d2 : T_ROM2DATAO;`
87			`signal romodatao_d2 : T_ROM2DATAO;`
88			`signal romedatao_d3 : T_ROM2DATAO;`
89			`signal romodatao_d3 : T_ROM2DATAO;`
90			`signal romedatao_d4 : T_ROM2DATAO;`
91			`signal romodatao_d4 : T_ROM2DATAO;`
92			`begin`
93
94			`ramraddro_sg:`
95			`ramraddro <= STD_LOGIC_VECTOR(rowr_reg & colr_reg);`
96
97			`rmemsel_sg:`
98			`rmemsel <= rmemsel_reg;`
99
100			`process(clk,rst)`
101			`begin`
102			`if rst = '1' then`
103			`stage2_cnt_reg <= (others => '1');`
104			`rmemsel_reg <= '0';`
105			`stage1_reg <= '0';`
106			`stage2_reg <= '0';`
107			`colram_reg <= (others => '0');`
108			`rowram_reg <= (others => '0');`
109			`col_reg <= (others => '0');`
110			`row_reg <= (others => '0');`
111			`latchbuf_reg <= (others => (others => '0'));`
112			`databuf_reg <= (others => (others => '0'));`
113			`odv_d0 <= '0';`
114			`colr_reg <= (others => '0');`
115			`rowr_reg <= (others => '0');`
116			`dataready_2_reg <= '0';`
117			`elsif clk='1' and clk'event then`
118			`stage2_reg <= '0';`
119			`odv_d0 <= '0';`
120			`datareadyack <= '0';`
121			`dataready_2_reg <= dataready;`
122
123			`----------------------------------`
124			`-- read DCT 1D to barrel shifer`
125			`----------------------------------`
126			`if stage1_reg = '1' then`
127
128			`-- right shift input data`
129			`latchbuf_reg(N-2 downto 0) <= latchbuf_reg(N-1 downto 1);`
130			`latchbuf_reg(N-1) <= RESIZE(SIGNED(ramdatao),RAMDATA_W+1);`
131
132			`colram_reg <= colram_reg + 1;`
133			`colr_reg <= colr_reg + 1;`
134
135			`if colram_reg = N-2 then`
136			`rowr_reg <= rowr_reg + 1;`
137			`end if;`
138
139			`if colram_reg = N-1 then`
140			`rowram_reg <= rowram_reg + 1;`
141			`if rowram_reg = N-1 then`
142			`stage1_reg <= '0';`
143			`colr_reg <= (others => '0');`
144			`-- release memory`
145			`rmemsel_reg <= not rmemsel_reg;`
146			`end if;`
147
148			`-- after this sum databuf_reg is in range of -256 to 254 (min to max)`
149			`databuf_reg(0) <= latchbuf_reg(1)+RESIZE(SIGNED(ramdatao),RAMDATA_W+1);`
150			`databuf_reg(1) <= latchbuf_reg(2)+latchbuf_reg(7);`
151			`databuf_reg(2) <= latchbuf_reg(3)+latchbuf_reg(6);`
152			`databuf_reg(3) <= latchbuf_reg(4)+latchbuf_reg(5);`
153			`databuf_reg(4) <= latchbuf_reg(1)-RESIZE(SIGNED(ramdatao),RAMDATA_W+1);`
154			`databuf_reg(5) <= latchbuf_reg(2)-latchbuf_reg(7);`
155			`databuf_reg(6) <= latchbuf_reg(3)-latchbuf_reg(6);`
156			`databuf_reg(7) <= latchbuf_reg(4)-latchbuf_reg(5);`
157
158			`-- 8 point input latched`
159			`stage2_reg <= '1';`
160			`end if;`
161			`end if;`
162
163			`--------------------------------`
164			`-- 2nd stage`
165			`--------------------------------`
166			`if stage2_cnt_reg < N then`
167			`stage2_cnt_reg <= stage2_cnt_reg + 1;`
168
169			`-- output data valid`
170			`odv_d0 <= '1';`
171
172			`-- increment column counter`
173			`col_reg <= col_reg + 1;`
174
175			`-- finished processing one input row`
176			`if col_reg = N - 1 then`
177			`row_reg <= row_reg + 1;`
178			`end if;`
179			`end if;`
180
181			`if stage2_reg = '1' then`
182			`stage2_cnt_reg <= (others => '0');`
183			`col_reg <= (0=>'1',others => '0');`
184			`end if;`
185			`--------------------------------`
186
187			`----------------------------------`
188			`-- wait for new data`
189			`----------------------------------`
190			`-- one of ram buffers has new data, process it`
191			`if dataready = '1' and dataready_2_reg = '0' then`
192			`stage1_reg <= '1';`
193			`-- to account for 1T RAM delay, increment RAM address counter`
194			`colram_reg <= (others => '0');`
195			`colr_reg <= (0=>'1',others => '0');`
196			`datareadyack <= '1';`
197			`end if;`
198			`----------------------------------`
199
200
201			`end if;`
202			`end process;`
203
204			`p_data_pipe : process(CLK, RST)`
205			`begin`
206			`if RST = '1' then`
207			`even_not_odd <= '0';`
208			`even_not_odd_d1 <= '0';`
209			`even_not_odd_d2 <= '0';`
210			`even_not_odd_d3 <= '0';`
211			`even_not_odd_d4 <= '0';`
212			`odv_d1 <= '0';`
213			`odv_d2 <= '0';`
214			`odv_d3 <= '0';`
215			`odv_d4 <= '0';`
216			`odv_d5 <= '0';`
217			`dcto_1 <= (others => '0');`
218			`dcto_2 <= (others => '0');`
219			`dcto_3 <= (others => '0');`
220			`dcto_4 <= (others => '0');`
221			`dcto_5 <= (others => '0');`
222			`elsif CLK'event and CLK = '1' then`
223			`even_not_odd <= stage2_cnt_reg(0);`
224			`even_not_odd_d1 <= even_not_odd;`
225			`even_not_odd_d2 <= even_not_odd_d1;`
226			`even_not_odd_d3 <= even_not_odd_d2;`
227			`even_not_odd_d4 <= even_not_odd_d3;`
228			`odv_d1 <= odv_d0;`
229			`odv_d2 <= odv_d1;`
230			`odv_d3 <= odv_d2;`
231			`odv_d4 <= odv_d3;`
232			`odv_d5 <= odv_d4;`
233
234			`if even_not_odd = '0' then`
235			`dcto_1 <= STD_LOGIC_VECTOR(RESIZE`
236			`(RESIZE(SIGNED(romedatao(0)),DA2_W) +`
237			`(RESIZE(SIGNED(romedatao(1)),DA2_W-1) & '0') +`
238			`(RESIZE(SIGNED(romedatao(2)),DA2_W-2) & "00"),`
239			`DA2_W));`
240			`else`
241			`dcto_1 <= STD_LOGIC_VECTOR(RESIZE`
242			`(RESIZE(SIGNED(romodatao(0)),DA2_W) +`
243			`(RESIZE(SIGNED(romodatao(1)),DA2_W-1) & '0') +`
244			`(RESIZE(SIGNED(romodatao(2)),DA2_W-2) & "00"),`
245			`DA2_W));`
246			`end if;`
247
248			`if even_not_odd_d1 = '0' then`
249			`dcto_2 <= STD_LOGIC_VECTOR(RESIZE`
250			`(signed(dcto_1) +`
251			`(RESIZE(SIGNED(romedatao_d1(3)),DA2_W-3) & "000") +`
252			`(RESIZE(SIGNED(romedatao_d1(4)),DA2_W-4) & "0000"),`
253			`DA2_W));`
254			`else`
255			`dcto_2 <= STD_LOGIC_VECTOR(RESIZE`
256			`(signed(dcto_1) +`
257			`(RESIZE(SIGNED(romodatao_d1(3)),DA2_W-3) & "000") +`
258			`(RESIZE(SIGNED(romodatao_d1(4)),DA2_W-4) & "0000"),`
259			`DA2_W));`
260			`end if;`
261
262			`if even_not_odd_d2 = '0' then`
263			`dcto_3 <= STD_LOGIC_VECTOR(RESIZE`
264			`(signed(dcto_2) +`
265			`(RESIZE(SIGNED(romedatao_d2(5)),DA2_W-5) & "00000") +`
266			`(RESIZE(SIGNED(romedatao_d2(6)),DA2_W-6) & "000000"),`
267			`DA2_W));`
268			`else`
269			`dcto_3 <= STD_LOGIC_VECTOR(RESIZE`
270			`(signed(dcto_2) +`
271			`(RESIZE(SIGNED(romodatao_d2(5)),DA2_W-5) & "00000") +`
272			`(RESIZE(SIGNED(romodatao_d2(6)),DA2_W-6) & "000000"),`
273			`DA2_W));`
274			`end if;`
275
276			`if even_not_odd_d3 = '0' then`
277			`dcto_4 <= STD_LOGIC_VECTOR(RESIZE`
278			`(signed(dcto_3) +`
279			`(RESIZE(SIGNED(romedatao_d3(7)),DA2_W-7) & "0000000") +`
280			`(RESIZE(SIGNED(romedatao_d3(8)),DA2_W-8) & "00000000"),`
281			`DA2_W));`
282			`else`
283			`dcto_4 <= STD_LOGIC_VECTOR(RESIZE`
284			`(signed(dcto_3) +`
285			`(RESIZE(SIGNED(romodatao_d3(7)),DA2_W-7) & "0000000") +`
286			`(RESIZE(SIGNED(romodatao_d3(8)),DA2_W-8) & "00000000"),`
287			`DA2_W));`
288			`end if;`
289
290			`if even_not_odd_d4 = '0' then`
291			`dcto_5 <= STD_LOGIC_VECTOR(RESIZE`
292			`(signed(dcto_4) +`
293			`(RESIZE(SIGNED(romedatao_d4(9)),DA2_W-9) & "000000000") -`
294			`(RESIZE(SIGNED(romedatao_d4(10)),DA2_W-10) & "0000000000"),`
295			`DA2_W));`
296			`else`
297			`dcto_5 <= STD_LOGIC_VECTOR(RESIZE`
298			`(signed(dcto_4) +`
299			`(RESIZE(SIGNED(romodatao_d4(9)),DA2_W-9) & "000000000") -`
300			`(RESIZE(SIGNED(romodatao_d4(10)),DA2_W-10) & "0000000000"),`
301			`DA2_W));`
302			`end if;`
303			`end if;`
304			`end process;`
305
306			`dcto <= dcto_5(DA2_W-1 downto 12);`
307			`odv <= odv_d5;`
308
309			`p_romaddr : process(CLK, RST)`
310			`begin`
311			`if RST = '1' then`
312			`romeaddro <= (others => (others => '0'));`
313			`romoaddro <= (others => (others => '0'));`
314			`elsif CLK'event and CLK = '1' then`
315			`for i in 0 to 10 loop`
316			`-- read precomputed MAC results from LUT`
317			`romeaddro(i) <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &`
318			`databuf_reg(0)(i) &`
319			`databuf_reg(1)(i) &`
320			`databuf_reg(2)(i) &`
321			`databuf_reg(3)(i);`
322			`-- odd`
323			`romoaddro(i) <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &`
324			`databuf_reg(4)(i) &`
325			`databuf_reg(5)(i) &`
326			`databuf_reg(6)(i) &`
327			`databuf_reg(7)(i);`
328			`end loop;`
329			`end if;`
330			`end process;`
331
332			`p_romdatao_dly : process(CLK, RST)`
333			`begin`
334			`if RST = '1' then`
335			`romedatao_d1 <= (others => (others => '0'));`
336			`romodatao_d1 <= (others => (others => '0'));`
337			`romedatao_d2 <= (others => (others => '0'));`
338			`romodatao_d2 <= (others => (others => '0'));`
339			`romedatao_d3 <= (others => (others => '0'));`
340			`romodatao_d3 <= (others => (others => '0'));`
341			`romedatao_d4 <= (others => (others => '0'));`
342			`romodatao_d4 <= (others => (others => '0'));`
343			`elsif CLK'event and CLK = '1' then`
344			`romedatao_d1 <= romedatao;`
345			`romodatao_d1 <= romodatao;`
346			`romedatao_d2 <= romedatao_d1;`
347			`romodatao_d2 <= romodatao_d1;`
348			`romedatao_d3 <= romedatao_d2;`
349			`romodatao_d3 <= romodatao_d2;`
350			`romedatao_d4 <= romedatao_d3;`
351			`romodatao_d4 <= romodatao_d3;`
352			`end if;`
353			`end process;`
354
355			`end RTL;`
356			`--------------------------------------------------------------------------------`
357