📄 dct1d_vhd.txt
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-- --
-- V H D L F I L E --
-- COPYRIGHT (C) 2006 --
-- --
--------------------------------------------------------------------------------
--
-- Title : DCT1D
-- Design : MDCT Core
-- Author : Michal Krepa
--
--------------------------------------------------------------------------------
--
-- File : DCT1D.VHD
-- Created : Sat Mar 5 7:37 2006
--
--------------------------------------------------------------------------------
--
-- Description : 1D Discrete Cosine Transform (1st stage)
--
--------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.NUMERIC_STD.all;
library WORK;
use WORK.MDCT_PKG.all;
--------------------------------------------------------------------------------
-- ENTITY
--------------------------------------------------------------------------------
entity DCT1D is
port(
clk : in STD_LOGIC;
rst : in std_logic;
dcti : in std_logic_vector(IP_W-1 downto 0);
idv : in STD_LOGIC;
romedatao0 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao1 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao2 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao3 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao4 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao5 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao6 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao7 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romedatao8 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao0 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao1 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao2 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao3 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao4 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao5 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao6 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao7 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
romodatao8 : in STD_LOGIC_VECTOR(ROMDATA_W-1 downto 0);
odv : out STD_LOGIC;
dcto : out std_logic_vector(OP_W-1 downto 0);
romeaddro0 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro1 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro2 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro3 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro4 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro5 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro6 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro7 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romeaddro8 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro0 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro1 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro2 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro3 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro4 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro5 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro6 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro7 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
romoaddro8 : out STD_LOGIC_VECTOR(ROMADDR_W-1 downto 0);
ramwaddro : out STD_LOGIC_VECTOR(RAMADRR_W-1 downto 0);
ramdatai : out STD_LOGIC_VECTOR(RAMDATA_W-1 downto 0);
ramwe : out STD_LOGIC;
wmemsel : out STD_LOGIC
);
end DCT1D;
--------------------------------------------------------------------------------
-- ARCHITECTURE
--------------------------------------------------------------------------------
architecture RTL of DCT1D is
type INPUT_DATA is array (N-1 downto 0) of SIGNED(IP_W downto 0);
signal databuf_reg : INPUT_DATA;
signal latchbuf_reg : INPUT_DATA;
signal col_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);
signal row_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);
signal rowr_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);
signal inpcnt_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);
signal ramdatai_s : STD_LOGIC_VECTOR(RAMDATA_W-1 downto 0);
signal ramwe_s : STD_LOGIC;
signal wmemsel_reg : STD_LOGIC;
signal stage2_reg : STD_LOGIC;
signal stage2_cnt_reg : UNSIGNED(RAMADRR_W-1 downto 0);
signal col_2_reg : UNSIGNED(RAMADRR_W/2-1 downto 0);
begin
ramwe_sg:
ramwe <= ramwe_s;
ramdatai_sg:
ramdatai <= ramdatai_s;
-- temporary
odv_sg:
odv <= ramwe_s;
dcto_sg:
dcto <= ramdatai_s(RAMDATA_W-1) & ramdatai_s(RAMDATA_W-1) & ramdatai_s;
wmemsel_sg:
wmemsel <= wmemsel_reg;
process(clk)
begin
if clk = '1' and clk'event then
if rst = '1' then
inpcnt_reg <= (others => '0');
latchbuf_reg <= (others => (others => '0'));
databuf_reg <= (others => (others => '0'));
stage2_reg <= '0';
stage2_cnt_reg <= (others => '1');
ramdatai_s <= (others => '0');
ramwe_s <= '0';
ramwaddro <= (others => '0');
col_reg <= (others => '0');
row_reg <= (others => '0');
wmemsel_reg <= '0';
col_2_reg <= (others => '0');
else
stage2_reg <= '0';
ramwe_s <= '0';
--------------------------------
-- 1st stage
--------------------------------
if idv = '1' then
inpcnt_reg <= inpcnt_reg + 1;
-- right shift input data
latchbuf_reg(N-2 downto 0) <= latchbuf_reg(N-1 downto 1);
latchbuf_reg(N-1) <= SIGNED('0' & dcti) - LEVEL_SHIFT;
if inpcnt_reg = N-1 then
-- after this sum databuf_reg is in range of -256 to 254 (min to max)
databuf_reg(0) <= latchbuf_reg(1)+(SIGNED('0' & dcti) - LEVEL_SHIFT);
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)-(SIGNED('0' & dcti) - LEVEL_SHIFT);
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);
stage2_reg <= '1';
end if;
end if;
--------------------------------
--------------------------------
-- 2nd stage
--------------------------------
if stage2_cnt_reg < N then
if stage2_cnt_reg(0) = '0' then
ramdatai_s <= STD_LOGIC_VECTOR(RESIZE
(RESIZE(SIGNED(romedatao0),DA_W) +
(RESIZE(SIGNED(romedatao1),DA_W-1) & '0') +
(RESIZE(SIGNED(romedatao2),DA_W-2) & "00") +
(RESIZE(SIGNED(romedatao3),DA_W-3) & "000") +
(RESIZE(SIGNED(romedatao4),DA_W-4) & "0000") +
(RESIZE(SIGNED(romedatao5),DA_W-5) & "00000") +
(RESIZE(SIGNED(romedatao6),DA_W-6) & "000000") +
(RESIZE(SIGNED(romedatao7),DA_W-7) & "0000000") -
(RESIZE(SIGNED(romedatao8),DA_W-8) & "00000000"),
DA_W)(DA_W-1 downto 12));
else
ramdatai_s <= STD_LOGIC_VECTOR(RESIZE
(RESIZE(SIGNED(romodatao0),DA_W) +
(RESIZE(SIGNED(romodatao1),DA_W-1) & '0') +
(RESIZE(SIGNED(romodatao2),DA_W-2) & "00") +
(RESIZE(SIGNED(romodatao3),DA_W-3) & "000") +
(RESIZE(SIGNED(romodatao4),DA_W-4) & "0000") +
(RESIZE(SIGNED(romodatao5),DA_W-5) & "00000") +
(RESIZE(SIGNED(romodatao6),DA_W-6) & "000000") +
(RESIZE(SIGNED(romodatao7),DA_W-7) & "0000000") -
(RESIZE(SIGNED(romodatao8),DA_W-8) & "00000000"),
DA_W)(DA_W-1 downto 12));
end if;
stage2_cnt_reg <= stage2_cnt_reg + 1;
-- write RAM
ramwe_s <= '1';
-- reverse col/row order for transposition purpose
ramwaddro <= STD_LOGIC_VECTOR(col_2_reg & row_reg);
-- increment column counter
col_reg <= col_reg + 1;
col_2_reg <= col_2_reg + 1;
-- finished processing one input row
if col_reg = 0 then
row_reg <= row_reg + 1;
-- switch to 2nd memory
if row_reg = N - 1 then
wmemsel_reg <= not wmemsel_reg;
col_reg <= (others => '0');
end if;
end if;
end if;
if stage2_reg = '1' then
stage2_cnt_reg <= (others => '0');
col_reg <= (0=>'1',others => '0');
col_2_reg <= (others => '0');
end if;
----------------------------------
end if;
end if;
end process;
-- read precomputed MAC results from LUT
romeaddro0 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(0) &
databuf_reg(1)(0) &
databuf_reg(2)(0) &
databuf_reg(3)(0);
romeaddro1 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(1) &
databuf_reg(1)(1) &
databuf_reg(2)(1) &
databuf_reg(3)(1);
romeaddro2 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(2) &
databuf_reg(1)(2) &
databuf_reg(2)(2) &
databuf_reg(3)(2);
romeaddro3 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(3) &
databuf_reg(1)(3) &
databuf_reg(2)(3) &
databuf_reg(3)(3);
romeaddro4 <= STD_LOGIC_VECTOR( col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(4) &
databuf_reg(1)(4) &
databuf_reg(2)(4) &
databuf_reg(3)(4);
romeaddro5 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(5) &
databuf_reg(1)(5) &
databuf_reg(2)(5) &
databuf_reg(3)(5);
romeaddro6 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(6) &
databuf_reg(1)(6) &
databuf_reg(2)(6) &
databuf_reg(3)(6);
romeaddro7 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(7) &
databuf_reg(1)(7) &
databuf_reg(2)(7) &
databuf_reg(3)(7);
romeaddro8 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(0)(8) &
databuf_reg(1)(8) &
databuf_reg(2)(8) &
databuf_reg(3)(8);
-- odd
romoaddro0 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(0) &
databuf_reg(5)(0) &
databuf_reg(6)(0) &
databuf_reg(7)(0);
romoaddro1 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(1) &
databuf_reg(5)(1) &
databuf_reg(6)(1) &
databuf_reg(7)(1);
romoaddro2 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(2) &
databuf_reg(5)(2) &
databuf_reg(6)(2) &
databuf_reg(7)(2);
romoaddro3 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(3) &
databuf_reg(5)(3) &
databuf_reg(6)(3) &
databuf_reg(7)(3);
romoaddro4 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(4) &
databuf_reg(5)(4) &
databuf_reg(6)(4) &
databuf_reg(7)(4);
romoaddro5 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(5) &
databuf_reg(5)(5) &
databuf_reg(6)(5) &
databuf_reg(7)(5);
romoaddro6 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(6) &
databuf_reg(5)(6) &
databuf_reg(6)(6) &
databuf_reg(7)(6);
romoaddro7 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(7) &
databuf_reg(5)(7) &
databuf_reg(6)(7) &
databuf_reg(7)(7);
romoaddro8 <= STD_LOGIC_VECTOR(col_reg(RAMADRR_W/2-1 downto 1)) &
databuf_reg(4)(8) &
databuf_reg(5)(8) &
databuf_reg(6)(8) &
databuf_reg(7)(8);
end RTL;
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