172 lines
5.6 KiB
VHDL
172 lines
5.6 KiB
VHDL
-- -----------------------------------------------------------------------------
|
|
-- Copyright (c) 2013 Benjamin Krill <benjamin@krll.de>
|
|
--
|
|
-- Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
-- of this software and associated documentation files (the "Software"), to deal
|
|
-- in the Software without restriction, including without limitation the rights
|
|
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
-- copies of the Software, and to permit persons to whom the Software is
|
|
-- furnished to do so, subject to the following conditions:
|
|
--
|
|
-- The above copyright notice and this permission notice shall be included in
|
|
-- all copies or substantial portions of the Software.
|
|
--
|
|
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
-- THE SOFTWARE.
|
|
-- -----------------------------------------------------------------------------
|
|
library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_std.all;
|
|
use work.dvi_package.all;
|
|
|
|
entity sig_write is
|
|
generic (
|
|
MEM_START_ADR : unsigned(29 downto 0) := "00" & x"0000000"
|
|
);
|
|
port (
|
|
clk : in std_logic;
|
|
rst_n : in std_logic;
|
|
ctrl_disable_wr : in std_logic;
|
|
|
|
-- memory interface
|
|
ddr2_clk : in std_logic;
|
|
ddr2_cmd_en_o : out std_logic;
|
|
ddr2_cmd_instr_o : out std_logic_vector( 2 downto 0);
|
|
ddr2_cmd_bl_o : out std_logic_vector( 5 downto 0);
|
|
ddr2_cmd_byte_addr_o : out std_logic_vector(29 downto 0);
|
|
ddr2_cmd_empty_i : in std_logic;
|
|
ddr2_cmd_full_i : in std_logic;
|
|
|
|
ddr2_wr_en_o : out std_logic;
|
|
ddr2_wr_mask_o : out std_logic_vector( 3 downto 0);
|
|
ddr2_wr_data_o : out std_logic_vector(31 downto 0);
|
|
ddr2_wr_full_i : in std_logic;
|
|
ddr2_wr_empty_i : in std_logic;
|
|
ddr2_wr_count_i : in std_logic_vector( 6 downto 0);
|
|
ddr2_wr_underrun_i : in std_logic;
|
|
ddr2_wr_error_i : in std_logic;
|
|
|
|
-- display output
|
|
hsync_i : in std_logic;
|
|
vsync_i : in std_logic;
|
|
color_en_i : in std_logic;
|
|
color_i : in color_t(COLOR_CNT-1 downto 0)
|
|
);
|
|
end sig_write;
|
|
|
|
architecture sig_write of sig_write is
|
|
signal color_en_l : std_logic;
|
|
signal color_en_iq : std_logic;
|
|
signal rst : std_logic;
|
|
signal px_fifo_wr : std_logic;
|
|
signal px_fifo_full : std_logic;
|
|
signal px_fifo_empty : std_logic;
|
|
signal px_fifo_cnt : std_logic_vector(10 downto 0);
|
|
signal px_fifo_din : std_logic_vector(31 downto 0);
|
|
signal enabled : std_logic;
|
|
signal vsync : std_logic;
|
|
signal vsync_m : std_logic;
|
|
signal vsync_v : std_logic;
|
|
signal vsync_vq : std_logic;
|
|
signal vsync_sh : std_logic_vector( 3 downto 0);
|
|
|
|
-- memory
|
|
signal mem_address : unsigned(27 downto 0);
|
|
signal mem_cmd_en : std_logic;
|
|
signal mem_wr_en : std_logic;
|
|
signal mem_wr_data : std_logic_vector(31 downto 0);
|
|
signal px_cnt : unsigned( 7 downto 0);
|
|
begin
|
|
rst <= not rst_n;
|
|
|
|
-- -------------------------------------------------------------------------------
|
|
-- MEMORY
|
|
-- -------------------------------------------------------------------------------
|
|
ddr2_cmd_byte_addr_o <= std_logic_vector(mem_address(27 downto 0) & "00");
|
|
ddr2_cmd_bl_o <= "111111";
|
|
ddr2_cmd_instr_o <= "000";
|
|
ddr2_cmd_en_o <= mem_cmd_en;
|
|
ddr2_wr_data_o <= mem_wr_data;
|
|
ddr2_wr_en_o <= mem_wr_en;
|
|
ddr2_wr_mask_o <= (others => '0');
|
|
|
|
process (clk, rst_n)
|
|
begin
|
|
if rst_n = '0' then
|
|
enabled <= '0';
|
|
vsync <= '0';
|
|
elsif rising_edge(clk) then
|
|
-- eliminate glitches
|
|
vsync_sh <= vsync_sh(2 downto 0) & vsync_i;
|
|
if vsync_sh = "1111" then
|
|
vsync <= '1';
|
|
elsif vsync_sh = "0000" then
|
|
vsync <= '0';
|
|
end if;
|
|
|
|
-- freeze frame switch
|
|
if vsync = '1' then
|
|
if ctrl_disable_wr = '1' then
|
|
enabled <= '0';
|
|
else
|
|
enabled <= '1';
|
|
end if;
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
|
px_fifo_wr <= color_en_i and enabled;
|
|
px_fifo_din <= (31 downto 24 => '0') & color_i(RED) & color_i(GREEN) & color_i(BLUE);
|
|
px_fifo_0: entity work.px_fifo
|
|
port map (
|
|
wr_clk => clk,
|
|
rd_clk => ddr2_clk,
|
|
rst => rst,
|
|
din => px_fifo_din,
|
|
wr_en => px_fifo_wr,
|
|
rd_en => mem_wr_en,
|
|
dout => mem_wr_data,
|
|
full => px_fifo_full,
|
|
empty => px_fifo_empty,
|
|
rd_data_count => px_fifo_cnt
|
|
);
|
|
|
|
mem_wr_en <= '1' when px_fifo_empty = '0' and ddr2_wr_full_i = '0' else '0';
|
|
mem_cmd_en <= '1' when px_cnt = x"40" else '0';
|
|
process (ddr2_clk, rst_n)
|
|
begin
|
|
if rst_n = '0' then
|
|
px_cnt <= (others => '0');
|
|
mem_address <= (others => '0');
|
|
vsync_m <= '0';
|
|
vsync_v <= '0';
|
|
vsync_vq <= '0';
|
|
elsif rising_edge(ddr2_clk) then
|
|
-- signal synchronizer
|
|
vsync_m <= vsync;
|
|
vsync_v <= vsync_m;
|
|
vsync_vq <= vsync_v;
|
|
|
|
if mem_cmd_en = '1' and mem_wr_en = '1' then
|
|
px_cnt <= x"01";
|
|
elsif mem_cmd_en = '1' then
|
|
px_cnt <= (others => '0');
|
|
elsif mem_wr_en = '1' then
|
|
px_cnt <= px_cnt + "1";
|
|
end if;
|
|
|
|
if vsync_vq = '1' and vsync_v = '0' then
|
|
mem_address <= MEM_START_ADR(29 downto 2);
|
|
elsif mem_cmd_en = '1' then
|
|
mem_address <= mem_address + x"040";
|
|
end if;
|
|
end if;
|
|
end process;
|
|
|
|
end sig_write;
|