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ibm2030.IBM2030/ibm2030-vga.vhd

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---------------------------------------------------------------------------
-- Copyright 2010 Lawrence Wilkinson lawrence@ljw.me.uk
--
-- This file is part of LJW2030, a VHDL implementation of the IBM
-- System/360 Model 30.
--
-- LJW2030 is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- LJW2030 is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with LJW2030 . If not, see <http://www.gnu.org/licenses/>.
--
---------------------------------------------------------------------------
--
-- File: ibm2030-vga.vhd
-- Creation Date:
-- Description:
-- Virtual front panel with indicators via VGA
-- Uses the vga_controller_640-60 module provided by Digilent
-- Page references like "5-01A" refer to the IBM Maintenance Diagram Manual (MDM)
-- for the 360/30 R25-5103-1
-- References like "02AE6" refer to coordinate "E6" on page "5-02A"
-- Logic references like "AB3D5" refer to card "D5" in board "B3" in gate "A"
-- Gate A is the main logic gate, B is the second (optional) logic gate,
-- C is the core storage and X is the CCROS unit
--
-- Revision History:
-- Revision 1.0 2010-07-09
-- Initial Release
-- Revision 1.1 2012-04-07
-- Add Multiplexor Tag indicators
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.numeric_std.all;
library work;
use work.Gates_package.all;
use work.Buses_package.all;
entity vga_panel IS
port
(
-- Inputs
Indicators : in std_logic_vector(IndicatorRange);
-- Outputs
Red,Green,Blue,HS,VS : out std_logic;
-- Clocks
Clock50 : in std_logic -- 50MHz clock
);
end entity vga_panel;
architecture behavioural of vga_panel is
-- Layout is 640x480 pixels, divided into 32 columns and 24 rows of 20x20 pixel 'characters'
constant totalLines : integer := 24;
constant totalColumns : integer := 32;
subtype lines is integer range 0 to (totalLines-1);
subtype columns is integer range 0 to (totalColumns-1);
constant totalCharacters : integer := (lines'right+1)*(columns'right+1);
subtype screenCharacterOffset is integer range 0 to totalCharacters-1;
-- Basic screen layout as characters, should correspond to indLayout
type screenType is array(lines,columns) of character;
constant screen : screenType :=
(" CN ADR W X ",
" P012345 P ! P18421 P84218421 ",
"SA CH CL CA CBCM CU CK ",
" P0123 0123 A0123 0101201AP0123 ",
"CR CD CF CG CV CC CS ",
" P 0123 012 01 01012A0123 ",
" COUNT REG ",
" P84218421 P84218421 ",
" DATA KEY COMM ",
" P84218421 P8421 8421 ",
" FLAGS TAGS CHECKS ",
" ***** **** $$$$$$ ",
" ***** ",
" ",
" TAGS BUS OUT ",
" stuvwxyz{ P84218421 ",
" MSAR a ",
" P84218421 P84218421 b ",
" MSDR ALU STAT CHKS ",
" P84218421 P84218421 cde fg ",
" B REG A REG h i jkl ",
" P84218421 P84218421 mno pqr ",
"A****B****C****D**** ",
" F****G****H****J**** "
);
-- Screen layout in terms of signals, 0 for fixed characters
type screenIndicators is array(lines,columns) of IndicatorRange;
constant indLayout : screenIndicators :=
(
-- CN,ADRP,W,X
1=>(1=>1,2=>2,3=>3,4=>4,5=>5,6=>6,7=>7, -- CN
10=>8, -- PA
12=>9, -- LP
14=>10,15=>11,16=>12,17=>13,18=>14,19=>15, -- W
22=>16,23=>17,24=>18,25=>19,26=>20,27=>21,28=>22,29=>23,30=>24, -- X
others=>0),
3=>(1=>25,2=>26,3=>27,4=>28,5=>29, -- SA,CH
7=>30,8=>31,9=>32,10=>33, -- CL
12=>34,13=>35,14=>36,15=>37,16=>38, -- AA,CA
18=>39,19=>40,20=>41,21=>42,22=>43,23=>44,24=>45,25=>46,26=>47,27=>48,28=>49,29=>50,30=>51, -- CB,CM,CU,AK,PK,CK
others=>0),
5=>(1=>52, -- PC
3=>53,4=>54,5=>55,6=>56, -- CD
13=>57,14=>58,15=>59, -- CF
18=>60,19=>61, -- CG
21=>62,22=>63,23=>64,24=>65,25=>66,26=>67,27=>68,28=>69,29=>70,30=>71, -- CV,CC,SA,CS
others=>0),
-- Skip SX1 6-12
-- Skip SX2 13-15
-- 13=>(0=>222,1=>218,2=>219,3=>220,4=>221,others => 0), -- P1,2,3,4 for now
-- 14=>(1=>223,2=>224,3=>225,4=>226,others => 0), -- T1,2,3,4 for now
-- 15=>(0=>235,1=>227,2=>228,3=>229,4=>230,5=>231,6=>232,7=>233,8=>234,others=>0),
-- End of SX
15=>(1=>128,2=>129,3=>130,4=>131,5=>132,6=>133,7=>134,8=>135,9=>136, -- Mpx Tags
16=>137,17=>138,18=>139,19=>140,20=>141,21=>142,22=>143,23=>144,24=>145, -- Mpx Bus
others=>0),
16=>(21=>146, -- MAIN STG
others=>0),
17=>(1=>147,2=>148,3=>149,4=>150,5=>151,6=>152,7=>153,8=>154,9=>155, -- M
11=>156,12=>157,13=>158,14=>159,15=>160,16=>161,17=>162,18=>163,19=>164, -- N
21=>165, -- LOC STG
others=>0),
19=>(1=>166,2=>167,3=>168,4=>169,5=>170,6=>171,7=>172,8=>173,9=>174, -- MSDR
11=>175,12=>176,13=>177,14=>178,15=>179,16=>180,17=>181,18=>182,19=>183, -- ALU
22=>184,23=>185,24=>186, -- Stat
27=>187,28=>188, -- Chks
others=>0),
20=>(22=>189,24=>190, -- Stat
27=>191,28=>192,29=>193, -- Chks
others=>0),
21=>(1=>203,2=>204,3=>205,4=>206,5=>207,6=>208,7=>209,8=>210,9=>211, -- B
11=>194,12=>195,13=>196,14=>197,15=>198,16=>199,17=>200,18=>201,19=>202, -- A
22=>212,23=>213,24=>214, -- Stat
27=>215,28=>216,29=>217, -- Chks
others=>0),
22=>(1=>218,2=>219,3=>220,4=>221,6=>222,7=>223,8=>224,9=>225,11=>226,12=>227,13=>228,14=>229,16=>230,17=>231,18=>232,19=>233,others=>0),
23=>(12=>234,13=>235,14=>236,15=>237,17=>238,18=>239,19=>240,20=>241,22=>242,23=>243,24=>244,25=>245,27=>246,28=>247,29=>248,30=>249,others=>0),
others=>(others => 0));
-- To convert ASCII to the internal 6-bit representation...
-- Not all characters are needed, so some special ones are added
subtype characterCode is std_logic_vector(6 downto 0);
type charArray is array(32 to 123) of characterCode;
constant charTranslate : charArray := (
-- 20->62, 21 ! ->61, 22-23->127, 24->59, 25-29->127, 2A->60, 2B-2F->127
"0111110","0111101","1111111","1111111","0111011","1111111","1111111","1111111",
"1111111","1111111","0111100","1111111","1111111","1111111","1111111","1111111",
-- 30 0 to 39 9 -> 0 to 9, 3A : to 3F ? -> 127
"0000000","0000001","0000010","0000011","0000100","0000101","0000110","0000111",
"0001000","0001001","1111111","1111111","1111111","1111111","1111111","1111111",
-- 40 @ -> 127, 41 A to 4F O -> 10 to 24
"1111111","0001010","0001011","0001100","0001101","0001110","0001111","0010000",
"0010001","0010010","0010011","0010100","0010101","0010110","0010111","0011000",
-- 50 P to 5A Z -> 25 to 35
"0011001","0011010","0011011","0011100","0011101","0011110","0011111","0100000",
"0100001","0100010","0100011",
-- 5B to 60 -> 127
"1111111","1111111","1111111","1111111","1111111","1111111",
-- 61 a to 6F o -> 63 to 77
"0111111","1000000","1000001","1000010","1000011","1000100","1000101","1000110",
"1000111","1001000","1001001","1001010","1001011","1001100","1001101",
-- 70 p to 7A z -> 78 to 88, 7B { -> 89
"1001110","1001111","1010000","1010001","1010010","1010011","1010100","1010101",
"1010110","1010111","1011000","1011001"
);
-- Character bitmaps
-- Fairly self-explanatory
constant characterHeight : integer := 20;
constant characterWidth : integer := 20;
subtype pixLinesRange is integer range 0 to (characterHeight-1);
subtype pixColsRange is integer range 0 to (characterWidth-1);
subtype pixelType is std_logic_vector(1 to 3); -- RGB
subtype pixelRow is std_logic_vector(pixColsRange); -- One scan line
subtype characterRange is integer range 0 to (2**(characterCode'left+1)-1);
type characterGeneratorType is array(characterRange,pixLinesRange) of pixelRow;
constant characterGenerator : characterGeneratorType :=
( 0 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000111100000000",
"00000001111110000000",
"00000011100111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011100111000000",
"00000001111110000000",
"00000000111100000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
1 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000011000000000",
"00000000111000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000111100000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
2 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000111110000000",
"00000001111111000000",
"00000011000011000000",
"00000000000011000000",
"00000000000011000000",
"00000000000110000000",
"00000000001100000000",
"00000000011000000000",
"00000000110000000000",
"00000001111111000000",
"00000011111111000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
3 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000010000011000000",
"00000000000011000000",
"00000000000111000000",
"00000000011110000000",
"00000000000110000000",
"00000000000011000000",
"00000010000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
4 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000001100000000",
"00000000011100000000",
"00000000011100000000",
"00000000111100000000",
"00000000101100000000",
"00000001101100000000",
"00000011001100000000",
"00000011111111000000",
"00000011111111000000",
"00000000001100000000",
"00000000001100000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
5 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111111000000",
"00000011111111000000",
"00000011000000000000",
"00000011000000000000",
"00000011111110000000",
"00000011111111000000",
"00000000000011000000",
"00000000000011000000",
"00000000000011000000",
"00000011111111000000",
"00000011111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
6 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000000000000",
"00000011111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
7 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111111000000",
"00000011111111000000",
"00000000000011000000",
"00000000000110000000",
"00000000000110000000",
"00000000001100000000",
"00000000001100000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
8 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000111100000000",
"00000001111110000000",
"00000011000011000000",
"00000011000011000000",
"00000001111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
10 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000011000000000",
"00000000111100000000",
"00000001100110000000",
"00000001100110000000",
"00000001000010000000",
"00000011111111000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
11 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011111110000000",
"00000011111110000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000011111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
12 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
13 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000011111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
14 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111111000000",
"00000011111111000000",
"00000011000000000000",
"00000011000000000000",
"00000011111100000000",
"00000011111100000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011111111000000",
"00000011111111000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
15 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111111000000",
"00000011111111000000",
"00000011000000000000",
"00000011000000000000",
"00000011111100000000",
"00000011111100000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
16 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000000000000",
"00000011000000000000",
"00000011001111000000",
"00000011001111000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000001111111000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
17 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
19 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111111000000",
"00000011111111000000",
"00000000001100000000",
"00000000001100000000",
"00000000001100000000",
"00000000001100000000",
"00000000001100000000",
"00000011001100000000",
"00000011001100000000",
"00000011111100000000",
"00000001111000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
20=> ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000110000000",
"00000011001100000000",
"00000011011000000000",
"00000011110000000000",
"00000011100000000000",
"00000011110000000000",
"00000011011000000000",
"00000011001100000000",
"00000011000110000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
21 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011111111000000",
"00000011111111000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
22 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011100111000000",
"00000011111111000000",
"00000011111111000000",
"00000011011011000000",
"00000011011011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
23 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011100011000000",
"00000011110011000000",
"00000011110011000000",
"00000011011011000000",
"00000011011011000000",
"00000011011011000000",
"00000011001111000000",
"00000011001111000000",
"00000011000111000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
24 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
25 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000011111110000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000011000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
27 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000011111110000000",
"00000011111000000000",
"00000011011100000000",
"00000011001110000000",
"00000011000111000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
28 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000011000011000000",
"00000011100000000000",
"00000001110000000000",
"00000000111100000000",
"00000000001110000000",
"00000000000111000000",
"00000011000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
29 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011111111000000",
"00000011111111000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
30=> ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
31 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011100111000000",
"00000011100111000000",
"00000001100110000000",
"00000001111110000000",
"00000000111100000000",
"00000000111100000000",
"00000000011000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
32 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011000011000000",
"00000011011011000000",
"00000011011011000000",
"00000011111111000000",
"00000011100111000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
33 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000011000000",
"00000011100111000000",
"00000000111100000000",
"00000000011000000000",
"00000000011000000000",
"00000000111100000000",
"00000001100110000000",
"00000011100111000000",
"00000011000011000000",
"00000011000011000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
34 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000011000011000000",
"00000011000011000000",
"00000011100111000000",
"00000001111110000000",
"00000000111100000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000011000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
59 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000111111111100000",
"00001111111111110000",
"00001111111111110000",
"00001111111111110000",
"00001111111111110000",
"00001111111111110000",
"00000111111111100000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
60 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000001111110000000",
"00000011111111000000",
"00000111111111100000",
"00001111111111110000",
"00001111111111110000",
"00001111111111110000",
"00001111111111110000",
"00001111111111110000",
"00000111111111100000",
"00000011111111000000",
"00000001111110000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000"),
61 => ("00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"00000000000000000000",
"01100000000111111100",
"01100000000111111110",
"01100000000110000110",
"01100000000110000110",
"01100000000111111110",
"01100000000111111100",
"01100000000110000000",
"01100000000110000000",
"01100000000110000000",
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);
-- Palette definition
-- Each of the 64 characters has its own palette with a FG and BG
-- colour for the Off and On states
-- The bitmaps above provide the FG/BG selection, the Indicators
-- input signals provide the Off/On selection
subtype sigRange is integer range 0 to 1;
subtype paletteRange is integer range 0 to 1;
type paletteType is array(sigRange,paletteRange) of pixelType;
type fullPaletteType is array(characterRange) of paletteType;
constant characterPalette : fullPaletteType :=
( -- Order is: BGOff FGOff BGOn FGOn
59 => (("011","000"),("011","100")),-- Chks are red
61 => (("011","000"),("011","100")),-- LP is red
68 => (("011","000"),("011","100")),-- STOR ADDR is red
69 => (("011","000"),("011","100")),-- STOR DATA is red
72 => (("011","000"),("011","100")),-- B REG is red
73 => (("011","000"),("011","100")),-- A REG is red
74 => (("011","000"),("011","100")),-- ALU is red
78 => (("011","000"),("011","100")),-- ROS ADR is red
79 => (("011","000"),("011","100")),-- ROS SALS is red
80 => (("011","000"),("011","100")),-- CTRL REG is red
others => (("011","000"),("011","110"))
);
-- VGA generation
constant hpixels : std_logic_vector(9 downto 0) := "1100100000"; --Value of pixels in a horizontal line (800)
constant vlines : std_logic_vector(9 downto 0) := "1000001001"; --Number of horizontal lines in the display (529)
constant hbp : std_logic_vector(9 downto 0) := "0010010000"; --Horizontal back porch (144)
constant hfp : std_logic_vector(9 downto 0) := "1100010000"; --Horizontal front porch (784)
-- constant hbp : std_logic_vector(9 downto 0) := "0010100000"; --Horizontal back porch (160)
-- constant hfp : std_logic_vector(9 downto 0) := "1100000000"; --Horizontal front porch (768)
constant vbp : std_logic_vector(9 downto 0) := "0000011111"; --Vertical back porch (31)
constant vfp : std_logic_vector(9 downto 0) := "0111111111"; --Vertical front porch (511)
signal hc, vc : std_logic_vector(10 downto 0) := (others=>'0'); --These are the Horizontal and Vertical counters
signal clkdiv : std_logic := '0'; --Clock divider
signal vidoff : std_logic; --Tells whether or not its ok to display data
signal currentLP : std_logic_vector(5 downto 0) := (others=>'0'); -- Vertical Pixel 0 to 19
signal currentCP : std_logic_vector(5 downto 0) := (others=>'0'); -- Horizontal Pixel 0 to 19
signal currentLine : std_logic_vector(10 downto 0) := (others=>'0'); -- Line 0 to 23
signal currentColumn : std_logic_vector(10 downto 0) := (others=>'0'); -- Column 0 to 31
-- Keyboard handling
signal keyboard_data_rdy : std_logic;
signal keyboard_busy : std_logic;
signal keyboard_error : std_logic;
type screenCharacters is array(lines,columns) of characterCode;
-- This function converts the ASCII screen layout into the internal version
function initScreen (constant screen : screenType) return screenCharacters is
variable sc : screenCharacters;
begin
for r in lines loop
for c in columns loop
sc(r,c) := charTranslate(character'pos(screen(r,c)));
end loop;
end loop;
return sc;
end function;
constant charLayout : screenCharacters := initScreen(screen);
begin
vgaController : entity work.vga_controller_640_60 port map (
rst => '0',
pixel_clk => clkdiv,
HS => HS,
VS => VS,
hcount => hc,
vcount => vc,
hchar => currentColumn,
vchar => currentLine,
hpixel => currentCP,
vpixel => currentLP,
blank => vidoff
);
--This cuts the 50Mhz clock in half
process(Clock50)
variable currentInd : IndicatorRange;
variable currentChar : characterCode;
variable pixRow : pixelRow;
variable pixPalette : paletteType;
variable pix : pixelType;
variable fgbg : paletteRange;
variable ind : sigRange;
begin
if(Clock50 = '1' and Clock50'EVENT) then
clkdiv <= not clkdiv;
currentInd := indLayout(lines(CONV_INTEGER(currentLine)),columns(CONV_INTEGER(currentColumn)));
currentChar := charLayout(lines(CONV_INTEGER(currentLine)),columns(CONV_INTEGER(currentColumn)));
if Indicators(currentInd)='1' then ind := 1; else ind := 0; end if;
pixRow := characterGenerator(characterRange(CONV_INTEGER(currentChar)),pixLinesRange(CONV_INTEGER(currentLP)));
if pixRow(pixColsRange(CONV_INTEGER(currentCP)))='1' then fgbg := 1; else fgbg := 0; end if;
pixPalette := characterPalette(characterRange(characterRange(CONV_INTEGER(currentChar))));
pix := pixPalette(ind,fgbg);
Red <= pix(1) and not vidoff;
Green <= pix(2) and not vidoff;
Blue <= pix(3) and not vidoff;
end if;
end process;
END behavioural;
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