library IEEE;
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library IEEE;
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use IEEE.std_logic_1164.all;
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use IEEE.std_logic_1164.all;
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use IEEE.std_logic_unsigned.all;
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use IEEE.std_logic_unsigned.all;
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-- use IEEE.std_logic_arith.all;
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-- use IEEE.std_logic_arith.all;
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use IEEE.numeric_std.all;
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use IEEE.numeric_std.all;
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--use IEEE.std_logic_signed.all;
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--use IEEE.std_logic_signed.all;
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--use IEEE.math_real.all;
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--use IEEE.math_real.all;
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--use IEEE.math_complex.all;
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--use IEEE.math_complex.all;
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ENTITY video_80x40 is
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ENTITY video_80x40 is
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PORT( CLOCK_50 : IN STD_LOGIC;
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PORT( CLOCK_50 : IN STD_LOGIC;
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VRAM_DATA : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
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VRAM_DATA : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
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VRAM_ADDR : OUT STD_LOGIC_VECTOR(12 DOWNTO 0);
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VRAM_ADDR : OUT STD_LOGIC_VECTOR(12 DOWNTO 0);
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VRAM_CLOCK : OUT STD_LOGIC;
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VRAM_CLOCK : OUT STD_LOGIC;
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VRAM_WREN : OUT STD_LOGIC;
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VRAM_WREN : OUT STD_LOGIC;
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VGA_R,
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VGA_R,
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VGA_G,
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VGA_G,
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VGA_B : OUT STD_LOGIC_VECTOR(3 DOWNTO 0);
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VGA_B : OUT STD_LOGIC_VECTOR(3 DOWNTO 0);
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VGA_HS,
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VGA_HS,
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VGA_VS : OUT STD_LOGIC);
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VGA_VS : OUT STD_LOGIC);
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END video_80x40;
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END video_80x40;
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ARCHITECTURE A OF video_80x40 IS
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ARCHITECTURE A OF video_80x40 IS
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-- Added for VDU support
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-- Added for VDU support
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signal Clock_video : std_logic;
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signal Clock_video : std_logic;
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signal VGA_R_sig : std_logic_vector(3 downto 0);
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signal VGA_R_sig : std_logic_vector(3 downto 0);
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signal VGA_G_sig : std_logic_vector(3 downto 0);
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signal VGA_G_sig : std_logic_vector(3 downto 0);
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signal VGA_B_sig : std_logic_vector(3 downto 0);
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signal VGA_B_sig : std_logic_vector(3 downto 0);
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signal pixel_row_sig : std_logic_vector(9 downto 0);
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signal pixel_row_sig : std_logic_vector(9 downto 0);
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signal pixel_column_sig : std_logic_vector(9 downto 0);
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signal pixel_column_sig : std_logic_vector(9 downto 0);
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signal pixel_clock_sig : std_logic;
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signal pixel_clock_sig : std_logic;
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signal char_addr_sig : std_logic_vector(7 downto 0);
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signal char_addr_sig : std_logic_vector(7 downto 0);
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signal font_row_sig : std_logic_vector(2 downto 0);
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signal font_row_sig : std_logic_vector(2 downto 0);
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signal font_col_sig : std_logic_vector(2 downto 0);
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signal font_col_sig : std_logic_vector(2 downto 0);
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signal pixel_sig : std_logic;
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signal pixel_sig : std_logic;
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signal video_on_sig : std_logic;
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signal video_on_sig : std_logic;
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BEGIN
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BEGIN
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VGA_R_sig <= "0000";
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VGA_R_sig <= "0000";
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VGA_G_sig <= "0000";
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VGA_G_sig <= "0000";
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VGA_B_sig <= pixel_sig & pixel_sig & pixel_sig & pixel_sig;
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VGA_B_sig <= pixel_sig & pixel_sig & pixel_sig & pixel_sig;
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VRAM_WREN <= video_on_sig;
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VRAM_WREN <= video_on_sig;
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VRAM_CLOCK <= pixel_clock_sig;
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VRAM_CLOCK <= pixel_clock_sig;
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VRAM_ADDR <= (pixel_row_sig(9 downto 4) * "0101000" + pixel_column_sig(9 downto 4));
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VRAM_ADDR <= (pixel_row_sig(9 downto 4) * "0101000" + pixel_column_sig(9 downto 4));
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-- Fonts ROM read
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-- Fonts ROM read
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char_addr_sig <= VRAM_DATA;
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char_addr_sig <= VRAM_DATA;
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font_row_sig(2 downto 0) <= pixel_row_sig(3 downto 1);
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font_row_sig(2 downto 0) <= pixel_row_sig(3 downto 1);
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font_col_sig(2 downto 0) <= pixel_column_sig(3 downto 1);
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font_col_sig(2 downto 0) <= pixel_column_sig(3 downto 1);
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vga_sync_inst : work.vga_sync
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vga_sync_inst : work.vga_sync
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port map (
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port map (
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clock_50Mhz => CLOCK_50,
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clock_50Mhz => CLOCK_50,
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red => VGA_R_sig,
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red => VGA_R_sig,
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green => VGA_G_sig,
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green => VGA_G_sig,
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blue => VGA_B_sig,
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blue => VGA_B_sig,
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red_out => VGA_R,
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red_out => VGA_R,
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green_out => VGA_G,
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green_out => VGA_G,
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blue_out => VGA_B,
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blue_out => VGA_B,
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horiz_sync_out => VGA_HS,
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horiz_sync_out => VGA_HS,
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vert_sync_out => VGA_VS,
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vert_sync_out => VGA_VS,
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video_on => video_on_sig,
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video_on => video_on_sig,
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pixel_clock => pixel_clock_sig,
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pixel_clock => pixel_clock_sig,
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pixel_row => pixel_row_sig,
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pixel_row => pixel_row_sig,
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pixel_column => pixel_column_sig
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pixel_column => pixel_column_sig
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);
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);
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char_rom_inst : work.char_rom
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char_rom_inst : work.char_rom
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port map (
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port map (
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clock => pixel_clock_sig,
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clock => pixel_clock_sig,
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character_address => char_addr_sig,
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character_address => char_addr_sig,
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font_row => font_row_sig,
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font_row => font_row_sig,
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font_col => font_col_sig,
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font_col => font_col_sig,
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rom_mux_output => pixel_sig
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rom_mux_output => pixel_sig
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);
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);
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END A;
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END A;
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