Subversion Repositories yavga

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----                                                                        ----

---- This file is part of the yaVGA project                                 ----

---- http://www.opencores.org/?do=project&who=yavga                         ----

----                                                                        ----

---- Description                                                            ----

---- Implementation of yaVGA IP core                                        ----

----                                                                        ----

---- To Do:                                                                 ----

----                                                                        ----

----                                                                        ----

---- Author(s):                                                             ----

---- Sandro Amato, sdroamt@netscape.net                                     ----

----                                                                        ----

--------------------------------------------------------------------------------

----                                                                        ----

---- Copyright (c) 2009, Sandro Amato                                       ----

---- All rights reserved.                                                   ----

----                                                                        ----

---- Redistribution  and  use in  source  and binary forms, with or without ----

---- modification,  are  permitted  provided that  the following conditions ----

---- are met:                                                               ----

----                                                                        ----

----     * Redistributions  of  source  code  must  retain the above        ----

----       copyright   notice,  this  list  of  conditions  and  the        ----

----       following disclaimer.                                            ----

----     * Redistributions  in  binary form must reproduce the above        ----

----       copyright   notice,  this  list  of  conditions  and  the        ----

----       following  disclaimer in  the documentation and/or  other        ----

----       materials provided with the distribution.                        ----

----     * Neither  the  name  of  SANDRO AMATO nor the names of its        ----

----       contributors may be used to  endorse or  promote products        ----

----       derived from this software without specific prior written        ----

----       permission.                                                      ----

----                                                                        ----

---- THIS SOFTWARE IS PROVIDED  BY THE COPYRIGHT  HOLDERS AND  CONTRIBUTORS ----

---- "AS IS"  AND  ANY EXPRESS OR  IMPLIED  WARRANTIES, INCLUDING,  BUT NOT ----

---- LIMITED  TO, THE  IMPLIED  WARRANTIES  OF MERCHANTABILITY  AND FITNESS ----

---- FOR  A PARTICULAR  PURPOSE  ARE  DISCLAIMED. IN  NO  EVENT  SHALL  THE ----

---- COPYRIGHT  OWNER  OR CONTRIBUTORS  BE LIABLE FOR ANY DIRECT, INDIRECT, ----

---- INCIDENTAL,  SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, ----

---- BUT  NOT LIMITED  TO,  PROCUREMENT OF  SUBSTITUTE  GOODS  OR SERVICES; ----

---- LOSS  OF  USE,  DATA,  OR PROFITS;  OR  BUSINESS INTERRUPTION) HOWEVER ----

---- CAUSED  AND  ON  ANY THEORY  OF LIABILITY, WHETHER IN CONTRACT, STRICT ----

---- LIABILITY,  OR  TORT  (INCLUDING  NEGLIGENCE  OR OTHERWISE) ARISING IN ----

---- ANY  WAY OUT  OF THE  USE  OF  THIS  SOFTWARE,  EVEN IF ADVISED OF THE ----

---- POSSIBILITY OF SUCH DAMAGE.                                            ----

--------------------------------------------------------------------------------

library IEEE;

use IEEE.STD_LOGIC_1164.all;

package yavga_pkg is

-- Declare constants

  -- chars address and data bus size

  constant c_CHR_ADDR_BUS_W : integer := 11;

  constant c_CHR_DATA_BUS_W : integer := 32;

  constant c_CHR_WE_BUS_W   : integer := 4;

  -- internal used chars address and data bus size 

  constant c_INTCHR_ADDR_BUS_W : integer := 13;

  constant c_INTCHR_DATA_BUS_W : integer := 8;

  -- internal ROM chmaps address and data bus

  constant c_INTCHMAP_ADDR_BUS_W : integer := 11;

  constant c_INTCHMAP_DATA_BUS_W : integer := 8;

  -- waveform address and data bus size

  constant c_WAVFRM_ADDR_BUS_W : integer := 10;

  constant c_WAVFRM_DATA_BUS_W : integer := 16;

  constant c_GRID_SIZE : std_logic_vector(6 downto 0) := "1111111";

  constant c_GRID_BIT  : integer                      := 6;

  --

  -- horizontal timing signals (in pixels count )

  constant c_H_DISPLAYpx    : integer := 800;

  constant c_H_BACKPORCHpx  : integer := 63;  -- also 60;

  constant c_H_SYNCTIMEpx   : integer := 120;

  constant c_H_FRONTPORCHpx : integer := 56;  --also 60;

  constant c_H_PERIODpx     : integer := c_H_DISPLAYpx +

                                         c_H_BACKPORCHpx +

                                         c_H_SYNCTIMEpx +

                                         c_H_FRONTPORCHpx;

  constant c_H_COUNT_W : integer := 11;       -- = ceil(ln2(c_H_PERIODpx))

  --

  -- vertical timing signals (in lines count)

  constant c_V_DISPLAYln    : integer := 600;

  constant c_V_BACKPORCHln  : integer := 23;

  constant c_V_SYNCTIMEln   : integer := 6;

  constant c_V_FRONTPORCHln : integer := 37;

  constant c_V_PERIODln     : integer := c_V_DISPLAYln +

                                         c_V_BACKPORCHln +

                                         c_V_SYNCTIMEln +

                                         c_V_FRONTPORCHln;

  constant c_V_COUNT_W : integer := 10;  -- = ceil(ln2(c_V_PERIODln))

  constant c_X_W : integer := c_H_COUNT_W;

  constant c_Y_W : integer := c_V_COUNT_W;

--  constant c_CHARS_WIDTH: std_logic_vector(2 downto 0) := "111";

--  constant c_CHARS_HEIGHT: std_logic_vector(3 downto 0) := "1111";

--  constant c_CHARS_COLS: std_logic_vector(6 downto 0) := "1100011";

--  constant c_CHARS_ROWS: std_logic_vector(5 downto 0) := "100100";

  -- to manage the background and cursor colors

  constant c_CFG_BG_CUR_COLOR_ADDR : std_logic_vector(12 downto 0) := "0000001101100";  -- 108 BG:5..3 CUR:2..0

  -- to manage the cursor position  

  constant c_CFG_CURS_XY1 : std_logic_vector(12 downto 0) := "0000001101101";  -- 109

  constant c_CFG_CURS_XY2 : std_logic_vector(12 downto 0) := "0000001101110";  -- 110

  constant c_CFG_CURS_XY3 : std_logic_vector(12 downto 0) := "0000001101111";  -- 111

end yavga_pkg;

package body yavga_pkg is

end yavga_pkg;