//==================================================================//
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//==================================================================//
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// File: d_VGAdriver.v //
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// File: d_VGAdriver.v //
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// Version: 0.0.0.3 //
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// Version: 0.0.0.3 //
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -//
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -//
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// Copyright (C) Stephen Pickett //
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// Copyright (C) Stephen Pickett //
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// Jun 09, 2005 //
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// Jun 09, 2005 //
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// //
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// //
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// This program is free software; you can redistribute it and/or //
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// This program is free software; you can redistribute it and/or //
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// modify it under the terms of the GNU General Public License //
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// modify it under the terms of the GNU General Public License //
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// as published by the Free Software Foundation; either version 2 //
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// as published by the Free Software Foundation; either version 2 //
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// of the License, or (at your option) any later version. //
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// of the License, or (at your option) any later version. //
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// //
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// //
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// This program is distributed in the hope that it will be useful, //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// GNU General Public License for more details. //
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// //
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// //
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// If you have not received a copy of the GNU General Public License//
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// If you have not received a copy of the GNU General Public License//
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// along with this program; write to: //
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// along with this program; write to: //
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// Free Software Foundation, Inc., //
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// Free Software Foundation, Inc., //
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// 51 Franklin Street, Fifth Floor, //
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// 51 Franklin Street, Fifth Floor, //
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// Boston, MA 02110-1301, USA. //
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// Boston, MA 02110-1301, USA. //
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// //
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// //
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// Revisions: //
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// Revisions: //
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// Ver 0.0.0.1 Apr 28, 2005 Under Development //
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// Ver 0.0.0.1 Apr 28, 2005 Under Development //
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// 0.0.0.2 Jun 09, 2005 Cleaning //
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// 0.0.0.2 Jun 09, 2005 Cleaning //
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// 0.0.0.3 Jun 10, 2005 Re-structuerd the VCNT and HCNT //
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// 0.0.0.3 Jun 10, 2005 Re-structuerd the VCNT and HCNT //
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// so they line up with the PXLs. //
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// so they line up with the PXLs. //
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// //
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// //
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//==================================================================//
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//==================================================================//
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module Driver_VGA(
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module Driver_VGA(
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CLK_50MHZ, MASTER_RST,
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CLK_50MHZ, MASTER_RST,
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CLK_VGA,
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CLK_VGA,
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VGA_RAM_DATA, VGA_RAM_ADDR,
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VGA_RAM_DATA, VGA_RAM_ADDR,
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VGA_RAM_OE, VGA_RAM_WE, VGA_RAM_CS,
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VGA_RAM_OE, VGA_RAM_WE, VGA_RAM_CS,
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VGA_RAM_ACCESS_OK,
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VGA_RAM_ACCESS_OK,
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H_SYNC, V_SYNC, VGA_OUTPUT,
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H_SYNC, V_SYNC, VGA_OUTPUT,
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XCOORD, YCOORD,
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XCOORD, YCOORD,
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TRIGGER_LEVEL,
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TRIGGER_LEVEL,
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VERT_OFFSET,
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VERT_OFFSET,
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HORZ_OFFSET,
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HORZ_OFFSET,
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SHOW_LEVELS,
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SHOW_LEVELS,
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HCNT, VCNT,
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HCNT, VCNT,
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RGB_CHAR
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RGB_CHAR
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);
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);
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//==================================================================//
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//==================================================================//
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// PARAMETER DEFINITIONS //
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// PARAMETER DEFINITIONS //
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//==================================================================//
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//==================================================================//
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parameter P_black = 3'b000;
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parameter P_black = 3'b000;
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parameter P_yellow = 3'b110;
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parameter P_yellow = 3'b110;
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parameter P_cyan = 3'b011;
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parameter P_cyan = 3'b011;
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parameter P_green = 3'b010;
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parameter P_green = 3'b010;
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parameter P_white = 3'b111;
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parameter P_white = 3'b111;
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//==================================================================//
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//==================================================================//
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// VARIABLE DEFINITIONS //
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// VARIABLE DEFINITIONS //
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//==================================================================//
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//==================================================================//
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//----------------------//
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//----------------------//
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// INPUTS / OUTPUTS //
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// INPUTS / OUTPUTS //
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//----------------------//
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//----------------------//
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input CLK_50MHZ; // System wide clock
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input CLK_50MHZ; // System wide clock
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input MASTER_RST; // System wide reset
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input MASTER_RST; // System wide reset
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input CLK_VGA;
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input CLK_VGA;
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output H_SYNC; // The H_SYNC timing signal to the VGA monitor
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output H_SYNC; // The H_SYNC timing signal to the VGA monitor
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output V_SYNC; // The V_SYNC timing signal to the VGA monitor
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output V_SYNC; // The V_SYNC timing signal to the VGA monitor
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output[2:0] VGA_OUTPUT; // The 3-bit VGA output
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output[2:0] VGA_OUTPUT; // The 3-bit VGA output
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input[11:0] XCOORD, YCOORD;
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input[11:0] XCOORD, YCOORD;
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input[15:0] VGA_RAM_DATA;
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input[15:0] VGA_RAM_DATA;
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output[17:0] VGA_RAM_ADDR;
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output[17:0] VGA_RAM_ADDR;
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output VGA_RAM_OE, VGA_RAM_WE, VGA_RAM_CS;
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output VGA_RAM_OE, VGA_RAM_WE, VGA_RAM_CS;
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output VGA_RAM_ACCESS_OK;
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output VGA_RAM_ACCESS_OK;
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input[9:0] TRIGGER_LEVEL, HORZ_OFFSET, VERT_OFFSET;
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input[9:0] TRIGGER_LEVEL, HORZ_OFFSET, VERT_OFFSET;
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input SHOW_LEVELS;
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input SHOW_LEVELS;
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output[9:0] HCNT, VCNT;
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output[9:0] HCNT, VCNT;
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input[2:0] RGB_CHAR;
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input[2:0] RGB_CHAR;
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//----------------------//
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//----------------------//
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// WIRES / NODES //
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// WIRES / NODES //
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//----------------------//
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//----------------------//
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reg H_SYNC, V_SYNC;
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reg H_SYNC, V_SYNC;
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reg [2:0] VGA_OUTPUT;
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reg [2:0] VGA_OUTPUT;
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wire CLK_50MHZ, MASTER_RST;
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wire CLK_50MHZ, MASTER_RST;
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wire CLK_VGA;
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wire CLK_VGA;
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wire[11:0] XCOORD, YCOORD;
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wire[11:0] XCOORD, YCOORD;
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wire[15:0] VGA_RAM_DATA;
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wire[15:0] VGA_RAM_DATA;
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reg[17:0] VGA_RAM_ADDR;
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reg[17:0] VGA_RAM_ADDR;
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reg VGA_RAM_OE, VGA_RAM_WE, VGA_RAM_CS;
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reg VGA_RAM_OE, VGA_RAM_WE, VGA_RAM_CS;
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reg VGA_RAM_ACCESS_OK;
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reg VGA_RAM_ACCESS_OK;
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wire[9:0] TRIGGER_LEVEL, HORZ_OFFSET, VERT_OFFSET;
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wire[9:0] TRIGGER_LEVEL, HORZ_OFFSET, VERT_OFFSET;
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wire SHOW_LEVELS;
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wire SHOW_LEVELS;
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wire[9:0] HCNT, VCNT;
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wire[9:0] HCNT, VCNT;
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wire[2:0] RGB_CHAR;
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wire[2:0] RGB_CHAR;
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//----------------------//
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//----------------------//
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// REGISTERS //
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// REGISTERS //
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//----------------------//
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//----------------------//
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wire CLK_25MHZ = CLK_VGA;
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wire CLK_25MHZ = CLK_VGA;
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reg [9:0] hcnt; // Counter - generates the H_SYNC signal
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reg [9:0] hcnt; // Counter - generates the H_SYNC signal
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reg [9:0] vcnt; // Counter - counts the H_SYNC pulses to generate V_SYNC signal
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reg [9:0] vcnt; // Counter - counts the H_SYNC pulses to generate V_SYNC signal
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reg[2:0] vga_out;
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reg[2:0] vga_out;
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//==================================================================//
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//==================================================================//
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// FUNCTIONAL DEFINITIONS //
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// FUNCTIONAL DEFINITIONS //
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//==================================================================//
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//==================================================================//
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assign HCNT = hcnt;
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assign HCNT = hcnt;
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assign VCNT = vcnt;
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assign VCNT = vcnt;
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// SYNC TIMING COUNTERS //
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// SYNC TIMING COUNTERS //
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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always @ (posedge CLK_25MHZ or posedge MASTER_RST) begin
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always @ (posedge CLK_25MHZ or posedge MASTER_RST) begin
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if (MASTER_RST == 1'b1) begin
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if (MASTER_RST == 1'b1) begin
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hcnt <= 10'd0;
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hcnt <= 10'd0;
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vcnt <= 10'd430;
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vcnt <= 10'd430;
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end else if (hcnt == 10'd0799) begin
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end else if (hcnt == 10'd0799) begin
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hcnt <= 10'd0;
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hcnt <= 10'd0;
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if (vcnt == 10'd0)
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if (vcnt == 10'd0)
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vcnt <= 10'd520;
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vcnt <= 10'd520;
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else
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else
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vcnt <= vcnt - 1'b1;
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vcnt <= vcnt - 1'b1;
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end else
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end else
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hcnt <= hcnt + 1'b1;
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hcnt <= hcnt + 1'b1;
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end
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end
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// HORIZONTAL SYNC TIMING //
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// HORIZONTAL SYNC TIMING //
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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always @ (hcnt)
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always @ (hcnt)
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if (hcnt >= 10'd656 && hcnt <= 10'd751)
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if (hcnt >= 10'd656 && hcnt <= 10'd751)
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H_SYNC = 1'b0;
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H_SYNC = 1'b0;
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else
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else
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H_SYNC = 1'b1;
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H_SYNC = 1'b1;
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// VERTICAL SYNC TIMING //
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// VERTICAL SYNC TIMING //
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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always @ (vcnt)
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always @ (vcnt)
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if (vcnt == 10'd430 || vcnt == 10'd429)
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if (vcnt == 10'd430 || vcnt == 10'd429)
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V_SYNC = 1'b0;
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V_SYNC = 1'b0;
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else
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else
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V_SYNC = 1'b1;
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V_SYNC = 1'b1;
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// VGA DATA SIGNAL TIMING //
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// VGA DATA SIGNAL TIMING //
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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always @ (hcnt or vcnt or XCOORD or YCOORD or MASTER_RST or vga_out or SHOW_LEVELS or TRIGGER_LEVEL or VERT_OFFSET or HORZ_OFFSET or RGB_CHAR) begin
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always @ (hcnt or vcnt or XCOORD or YCOORD or MASTER_RST or vga_out or SHOW_LEVELS or TRIGGER_LEVEL or VERT_OFFSET or HORZ_OFFSET or RGB_CHAR) begin
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if(MASTER_RST == 1'b1) begin
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if(MASTER_RST == 1'b1) begin
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VGA_OUTPUT = P_black;
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VGA_OUTPUT = P_black;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// UNSEEN BORDERS //
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// UNSEEN BORDERS //
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end else if( (vcnt >= 10'd400) && (vcnt <= 10'd440) ) begin
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end else if( (vcnt >= 10'd400) && (vcnt <= 10'd440) ) begin
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VGA_OUTPUT = P_black;
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VGA_OUTPUT = P_black;
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end else if( (hcnt >= 10'd640) ) begin
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end else if( (hcnt >= 10'd640) ) begin
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VGA_OUTPUT = P_black;
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VGA_OUTPUT = P_black;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// MOUSE CURSORS //
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// MOUSE CURSORS //
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end else if(vcnt == YCOORD) begin
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end else if(vcnt == YCOORD) begin
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VGA_OUTPUT = P_green;
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VGA_OUTPUT = P_green;
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end else if(hcnt == XCOORD) begin
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end else if(hcnt == XCOORD) begin
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VGA_OUTPUT = P_green;
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VGA_OUTPUT = P_green;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// TRIGGER SPRITE (shows as ------T------ ) //
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// TRIGGER SPRITE (shows as ------T------ ) //
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (TRIGGER_LEVEL) && hcnt != 10'd556 && hcnt != 10'd558) begin
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (TRIGGER_LEVEL) && hcnt != 10'd556 && hcnt != 10'd558) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (TRIGGER_LEVEL+1'b1) && hcnt >= 10'd556 && hcnt <= 10'd558) begin
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (TRIGGER_LEVEL+1'b1) && hcnt >= 10'd556 && hcnt <= 10'd558) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (TRIGGER_LEVEL-1'b1) && hcnt == 10'd557) begin
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (TRIGGER_LEVEL-1'b1) && hcnt == 10'd557) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// VERTICAL OFFSET SPRITE (shows as ------V------ ) //
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// VERTICAL OFFSET SPRITE (shows as ------V------ ) //
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (VERT_OFFSET) && hcnt != 10'd560) begin
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (VERT_OFFSET) && hcnt != 10'd560) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (VERT_OFFSET+1'b1) && (hcnt == 10'd559 || hcnt == 10'd561)) begin
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (VERT_OFFSET+1'b1) && (hcnt == 10'd559 || hcnt == 10'd561)) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (VERT_OFFSET-1'b1) && hcnt == 10'd560) begin
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end else if(SHOW_LEVELS == 1'b1 && vcnt == (VERT_OFFSET-1'b1) && hcnt == 10'd560) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// HORIZONTAL1 OFFSET SPRITE (shows as ------H------ ) //
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// HORIZONTAL1 OFFSET SPRITE (shows as ------H------ ) //
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end else if(SHOW_LEVELS == 1'b1 && hcnt == (HORZ_OFFSET) && vcnt != 10'd102 && vcnt != 10'd100) begin
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end else if(SHOW_LEVELS == 1'b1 && hcnt == (HORZ_OFFSET) && vcnt != 10'd102 && vcnt != 10'd100) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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end else if(SHOW_LEVELS == 1'b1 && hcnt == (HORZ_OFFSET+1'b1) && (vcnt == 10'd100 || vcnt == 10'd101 || vcnt == 10'd102)) begin
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end else if(SHOW_LEVELS == 1'b1 && hcnt == (HORZ_OFFSET+1'b1) && (vcnt == 10'd100 || vcnt == 10'd101 || vcnt == 10'd102)) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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end else if(SHOW_LEVELS == 1'b1 && hcnt == (HORZ_OFFSET-1'b1) && (vcnt == 10'd100 || vcnt == 10'd101 || vcnt == 10'd102)) begin
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end else if(SHOW_LEVELS == 1'b1 && hcnt == (HORZ_OFFSET-1'b1) && (vcnt == 10'd100 || vcnt == 10'd101 || vcnt == 10'd102)) begin
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VGA_OUTPUT = P_yellow;
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VGA_OUTPUT = P_yellow;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// TOP, BOTTOM, LEFT AND RIGHT GRID LINES //
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// TOP, BOTTOM, LEFT AND RIGHT GRID LINES //
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end else if(vcnt == 10'd0 || vcnt == 10'd399 || vcnt == 10'd441) begin
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end else if(vcnt == 10'd0 || vcnt == 10'd399 || vcnt == 10'd441) begin
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VGA_OUTPUT = P_cyan;
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VGA_OUTPUT = P_cyan;
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end else if(hcnt == 10'd0 || hcnt == 10'd639) begin
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end else if(hcnt == 10'd0 || hcnt == 10'd639) begin
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VGA_OUTPUT = P_cyan;
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VGA_OUTPUT = P_cyan;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// CHARACTER DISPLAY
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// CHARACTER DISPLAY
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end else if(vcnt <= 10'd520 && vcnt >= 10'd441) begin
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end else if(vcnt <= 10'd520 && vcnt >= 10'd441) begin
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VGA_OUTPUT = RGB_CHAR;
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VGA_OUTPUT = RGB_CHAR;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// THE WAVEFORM //
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// THE WAVEFORM //
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end else if(vga_out != 0) begin
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end else if(vga_out != 0) begin
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VGA_OUTPUT = vga_out;
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VGA_OUTPUT = vga_out;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// MIDDLE GRID LINES (dashed at 8pxls) //
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// MIDDLE GRID LINES (dashed at 8pxls) //
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end else if(vcnt == 10'd199 && hcnt[3] == 1'b1) begin
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end else if(vcnt == 10'd199 && hcnt[3] == 1'b1) begin
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VGA_OUTPUT = P_cyan;
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VGA_OUTPUT = P_cyan;
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end else if((hcnt == 10'd319) && (vcnt <= 10'd399) && (vcnt[3] == 1'b1)) begin
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end else if((hcnt == 10'd319) && (vcnt <= 10'd399) && (vcnt[3] == 1'b1)) begin
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VGA_OUTPUT = P_cyan;
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VGA_OUTPUT = P_cyan;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// OTHER HORIZONTAL LINES (dashed at 4pxls) //
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// OTHER HORIZONTAL LINES (dashed at 4pxls) //
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end else if((vcnt == 10'd39 || vcnt == 10'd79 || vcnt == 10'd119 || vcnt == 10'd159 || vcnt == 10'd239 || vcnt == 10'd279 || vcnt == 10'd319 || vcnt == 10'd359) && (hcnt[2] == 1'b1)) begin
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end else if((vcnt == 10'd39 || vcnt == 10'd79 || vcnt == 10'd119 || vcnt == 10'd159 || vcnt == 10'd239 || vcnt == 10'd279 || vcnt == 10'd319 || vcnt == 10'd359) && (hcnt[2] == 1'b1)) begin
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VGA_OUTPUT = P_cyan;
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VGA_OUTPUT = P_cyan;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// OTHER VERTICAL LINES (dashed at 4pxls) //
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// OTHER VERTICAL LINES (dashed at 4pxls) //
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end else if(((hcnt[5:0] == 6'b111111) && (vcnt <= 10'd399)) && (vcnt[2] == 1'b1)) begin
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end else if(((hcnt[5:0] == 6'b111111) && (vcnt <= 10'd399)) && (vcnt[2] == 1'b1)) begin
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VGA_OUTPUT = P_cyan;
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VGA_OUTPUT = P_cyan;
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//------------------------------------------------------------------------------//
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//------------------------------------------------------------------------------//
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// OTHERWISE... //
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// OTHERWISE... //
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end else
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end else
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VGA_OUTPUT = P_black;
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VGA_OUTPUT = P_black;
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end
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end
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// RAM DATA READING //
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// RAM DATA READING //
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//------------------------------------------------------------------//
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//------------------------------------------------------------------//
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// on reset, ram_addr = 24 and add 25 on each pxl
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// on reset, ram_addr = 24 and add 25 on each pxl
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// row 0: ram_addr = 24 and 25 for each pxl
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// row 0: ram_addr = 24 and 25 for each pxl
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// row 1: ram_addr = 24 and 25 for each pxl
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// row 1: ram_addr = 24 and 25 for each pxl
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// ...
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// ...
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// row 15: ram_addr = 24 and 25 for each pxl
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// row 15: ram_addr = 24 and 25 for each pxl
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// row 16: ram_addr = 23 and 25 for each pxl *
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// row 16: ram_addr = 23 and 25 for each pxl *
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// row 17: ram_addr = 23 and 25 for each pxl *
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// row 17: ram_addr = 23 and 25 for each pxl *
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// ...
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// ...
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reg[4:0] ram_vcnt;
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reg[4:0] ram_vcnt;
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reg[15:0] ram_vshift;
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reg[15:0] ram_vshift;
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|
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always @ (posedge CLK_25MHZ or posedge MASTER_RST) begin
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always @ (posedge CLK_25MHZ or posedge MASTER_RST) begin
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if(MASTER_RST == 1'b1) begin
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if(MASTER_RST == 1'b1) begin
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ram_vshift <= 16'h8000;
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ram_vshift <= 16'h8000;
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end else if(vcnt > 10'd399) begin
|
end else if(vcnt > 10'd399) begin
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ram_vshift <= 16'h8000;
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ram_vshift <= 16'h8000;
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end else if(/*(vcnt <= 10'd399) && */(hcnt == 10'd640)) begin
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end else if(/*(vcnt <= 10'd399) && */(hcnt == 10'd640)) begin
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if(ram_vshift == 16'h0001)
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if(ram_vshift == 16'h0001)
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ram_vshift <= 16'h8000;
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ram_vshift <= 16'h8000;
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else
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else
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ram_vshift <= (ram_vshift >> 1);
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ram_vshift <= (ram_vshift >> 1);
|
end else
|
end else
|
ram_vshift <= ram_vshift;
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ram_vshift <= ram_vshift;
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end
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end
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|
|
always @ (posedge CLK_25MHZ or posedge MASTER_RST) begin
|
always @ (posedge CLK_25MHZ or posedge MASTER_RST) begin
|
if(MASTER_RST == 1'b1) begin
|
if(MASTER_RST == 1'b1) begin
|
ram_vcnt <= 5'd24;//5'b0
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ram_vcnt <= 5'd24;//5'b0
|
end else if(vcnt > 10'd399) begin
|
end else if(vcnt > 10'd399) begin
|
ram_vcnt <= 5'd24;
|
ram_vcnt <= 5'd24;
|
end else if(/*(vcnt >= 10'd30) &&*/ (hcnt == 10'd640) && (ram_vshift == 16'h0001)) begin
|
end else if(/*(vcnt >= 10'd30) &&*/ (hcnt == 10'd640) && (ram_vshift == 16'h0001)) begin
|
if(ram_vcnt == 5'd0)
|
if(ram_vcnt == 5'd0)
|
ram_vcnt <= 5'd24;
|
ram_vcnt <= 5'd24;
|
else
|
else
|
ram_vcnt <= ram_vcnt - 1'b1;
|
ram_vcnt <= ram_vcnt - 1'b1;
|
end else begin
|
end else begin
|
ram_vcnt <= ram_vcnt;
|
ram_vcnt <= ram_vcnt;
|
end
|
end
|
end
|
end
|
|
|
|
|
|
|
always @ (hcnt or ram_vcnt) begin
|
always @ (hcnt or ram_vcnt) begin
|
VGA_RAM_ADDR = ram_vcnt + (hcnt * 7'd25);
|
VGA_RAM_ADDR = ram_vcnt + (hcnt * 7'd25);
|
// VGA_RAM_ADDR = vcnt * hcnt;
|
// VGA_RAM_ADDR = vcnt * hcnt;
|
end
|
end
|
|
|
|
|
always @ (VGA_RAM_DATA or ram_vshift) begin
|
always @ (VGA_RAM_DATA or ram_vshift) begin
|
if((VGA_RAM_DATA & ram_vshift) != 16'b0)
|
if((VGA_RAM_DATA & ram_vshift) != 16'b0)
|
vga_out = P_white;
|
vga_out = P_white;
|
else
|
else
|
vga_out = 3'b0;
|
vga_out = 3'b0;
|
end
|
end
|
|
|
|
|
always begin
|
always begin
|
VGA_RAM_CS = 1'b0; // #CS
|
VGA_RAM_CS = 1'b0; // #CS
|
VGA_RAM_OE = 1'b0; // #OE
|
VGA_RAM_OE = 1'b0; // #OE
|
VGA_RAM_WE = 1'b1; // #WE
|
VGA_RAM_WE = 1'b1; // #WE
|
end
|
end
|
|
|
|
|
//------------------------------------------------------------------//
|
//------------------------------------------------------------------//
|
// ALL CLEAR? //
|
// ALL CLEAR? //
|
//------------------------------------------------------------------//
|
//------------------------------------------------------------------//
|
always @ (vcnt) begin
|
always @ (vcnt) begin
|
if(vcnt > 10'd399)
|
if(vcnt > 10'd399)
|
VGA_RAM_ACCESS_OK = 1'b1;
|
VGA_RAM_ACCESS_OK = 1'b1;
|
else
|
else
|
VGA_RAM_ACCESS_OK = 1'b0;
|
VGA_RAM_ACCESS_OK = 1'b0;
|
end
|
end
|
|
|
|
|
endmodule
|
endmodule
|
|
|