通过FPGA实现VGA实践

  • 一.VGA协议
  • 二.代码实现
  • 总结

一.VGA协议

1.CRT显示器的工作原理：
在显示器内部，电流流过线圈产生磁场，控制电子束流过显示器表面，水平是
从左向右流，垂直方向是从上向下流。只有当电子沿正方向流的时候（即从
左向右，从上到下）显示器工作(可视化区域，display/visible/active area)，
而当电子返回显示器的左面或上面的时候显示器不工作(不显示/空白/消隐，
blanking/black)。
2.VGA接口标准
VGA工业标准所要求的频率: • 时钟频率: 25.175MHz(像素输出的频率);
• 行频: 31469Hz;
• 场频: 59.94Hz。
显示器技术规格提供的行频一般在30kHz～45kHz(保守数据)，场频一般在
50Hz～75Hz(保守数据)，针对以上保守数据，以30kHz的行频进行扫描时
所需时钟频率为：30kHz×800(行周期)=24MHz，则场频为：30kHz÷525(
场周期)
3.协议相关参数

二.代码实现

1.取点阵字模
字模如下

2.具体字符显示代码

module VGA_test(
OSC_50,     //原CLK2_50时钟信号
VGA_CLK,    //VGA自时钟
VGA_HS,     //行同步信号
VGA_VS,     //场同步信号
VGA_BLANK,  //复合空白信号控制信号  当BLANK为低电平时模拟视频输出消隐电平，此时从R9~R0,G9~G0,B9~B0输入的所有数据被忽略
VGA_SYNC,   //符合同步控制信号      行时序和场时序都要产生同步脉冲
VGA_R,      //VGA绿色
VGA_B,      //VGA蓝色
VGA_G);     //VGA绿色input OSC_50;     //外部时钟信号CLK2_50output VGA_CLK,VGA_HS,VGA_VS,VGA_BLANK,VGA_SYNC;output [7:0] VGA_R,VGA_B,VGA_G;parameter H_FRONT = 16;     //行同步前沿信号周期长parameter H_SYNC = 96;      //行同步信号周期长parameter H_BACK = 48;      //行同步后沿信号周期长parameter H_ACT = 640;      //行显示周期长parameter H_BLANK = H_FRONT+H_SYNC+H_BACK;        //行空白信号总周期长parameter H_TOTAL = H_FRONT+H_SYNC+H_BACK+H_ACT;  //行总周期长耗时parameter V_FRONT = 11;     //场同步前沿信号周期长parameter V_SYNC = 2;       //场同步信号周期长parameter V_BACK = 31;      //场同步后沿信号周期长parameter V_ACT = 480;      //场显示周期长parameter V_BLANK = V_FRONT+V_SYNC+V_BACK;        //场空白信号总周期长parameter V_TOTAL = V_FRONT+V_SYNC+V_BACK+V_ACT;  //场总周期长耗时reg [10:0] H_Cont;        //行周期计数器reg [10:0] V_Cont;        //场周期计数器wire [7:0] VGA_R;         //VGA红色控制线wire [7:0] VGA_G;         //VGA绿色控制线wire [7:0] VGA_B;         //VGA蓝色控制线reg VGA_HS;reg VGA_VS;reg [10:0] X;             //当前行第几个像素点reg [10:0] Y;             //当前场第几行reg CLK_25;always@(posedge OSC_50)begin CLK_25=~CLK_25;         //时钟end assign VGA_SYNC = 1'b0;   //同步信号低电平assign VGA_BLANK = ~((H_Cont<H_BLANK)||(V_Cont<V_BLANK));  //当行计数器小于行空白总长或场计数器小于场空白总长时，空白信号低电平assign VGA_CLK = ~CLK_to_DAC;  //VGA时钟等于CLK_25取反assign CLK_to_DAC = CLK_25;always@(posedge CLK_to_DAC)beginif(H_Cont<H_TOTAL)           //如果行计数器小于行总时长H_Cont<=H_Cont+1'b1;      //行计数器+1else H_Cont<=0;              //否则行计数器清零if(H_Cont==H_FRONT-1)        //如果行计数器等于行前沿空白时间-1VGA_HS<=1'b0;             //行同步信号置0if(H_Cont==H_FRONT+H_SYNC-1) //如果行计数器等于行前沿+行同步-1VGA_HS<=1'b1;             //行同步信号置1if(H_Cont>=H_BLANK)          //如果行计数器大于等于行空白总时长X<=H_Cont-H_BLANK;        //X等于行计数器-行空白总时长   （X为当前行第几个像素点）else X<=0;                   //否则X为0endalways@(posedge VGA_HS)beginif(V_Cont<V_TOTAL)           //如果场计数器小于行总时长V_Cont<=V_Cont+1'b1;      //场计数器+1else V_Cont<=0;              //否则场计数器清零if(V_Cont==V_FRONT-1)       //如果场计数器等于场前沿空白时间-1VGA_VS<=1'b0;             //场同步信号置0if(V_Cont==V_FRONT+V_SYNC-1) //如果场计数器等于行前沿+场同步-1VGA_VS<=1'b1;             //场同步信号置1if(V_Cont>=V_BLANK)          //如果场计数器大于等于场空白总时长Y<=V_Cont-V_BLANK;        //Y等于场计数器-场空白总时长    （Y为当前场第几行）  else Y<=0;                   //否则Y为0endreg valid_yr;always@(posedge CLK_to_DAC)if(V_Cont == 10'd32)         //场计数器=32时valid_yr<=1'b1;           //行输入激活else if(V_Cont==10'd512)     //场计数器=512时valid_yr<=1'b0;           //行输入冻结wire valid_y=valid_yr;       //连线   reg valid_r;            always@(posedge CLK_to_DAC)   if((H_Cont == 10'd32)&&valid_y)     //行计数器=32时valid_r<=1'b1;                   //像素输入激活else if((H_Cont==10'd512)&&valid_y) //行计数器=512时 valid_r<=1'b0;                   //像素输入冻结wire valid = valid_r;               //连线wire[10:0] x_dis;     //像素显示控制信号wire[10:0] y_dis;     //行显示控制信号assign x_dis=X;       //连线Xassign y_dis=Y;       //连线Yparameter  //点阵字模：每一行char_lineXX是显示的一行，共272列char_line00=320'h00000000000000000000000000000000000000000000000000000000000000000000000000000000,  //第1行char_line01=320'h00000000000000000000000000000000000000000000000000000000000000000000000000000000,  //第2行char_line02=320'h00038000008002000000000000000000000000000000000000000000000000000000000000000000, //第3行char_line03=320'h0003C00000E003000000018000000000000000000000000000000000000000000000000000000000,//第4行char_line04=320'h0003801000C0078000000FC000000000000000000000000000000000000000000000000000000000,//第5行char_line05=320'h0003803800C00E000103FE0000000000000000000000000000000000000000000000000000000000, //第6行char_line06=320'h3FFFFFFC00C01C0001FC0000000001E007C0008007C003C01FFC03C001E003C00FFC008003C00000, //第7行char_line07=320'h180FE00000C03800018000000000061818600180182006201FFC0620061806200FFC018006200000, //第8行char_line08=320'h001FF00000C060000180C00000000C1830301F8030100C3010080C300C180C3010001F800C300000, //第9行char_line09=320'h003FB80000C0C0000100E00000000818301801803018181830101818081818181000018018180000, //第10行char_line0a=320'h007B9C0000C180000300C00000001800301801806008181820101818180018181000018018180000, //第11行char_line0b=320'h00F39E0000C200000300C0000000100030180180600C180820201808100018081000018018080000, //第12行char_line0c=320'h01E38F8000CC00000300C0000000100000180180600C300C0020300C1000300C10000180300C0000, //第13行char_line0d=320'h03C387F000D000000300C0000000300000180180600C300C0040300C3000300C10000180300C0000, //第14行char_line0e=320'h07838DFE00C000300300C030000033E000300180600C300C0040300C33E0300C13E00180300C0000,  //第15行char_line0f=320'h1FFFFEF83FFFFFF807FFFFF80000363000600180600C300C0040300C3630300C14300180300C0000,  //第16行char_line10=320'h38401F3000C100000200C0007FFE381803C00180701C300C0080300C3818300C18180180300C0000,  //第17行char_line11=320'h60003C0000C100000000C0000000380800700180302C300C0080300C3808300C10080180300C0000,  //第18行char_line12=320'h0001F00000C080000000C0000000300C00180180186C300C0100300C300C300C000C0180300C0000,  //第19行char_line13=320'h0001E00000C0C0000030C4000000300C000801800F8C300C0100300C300C300C000C0180300C0000,  //第20行char_line14=320'h0001E01000C060000038C2000000300C000C0180000C300C0100300C300C300C000C0180300C0000,  //第21行char_line15=320'h0001C03800C030000060C1800000300C000C01800018300C0100300C300C300C000C0180300C0000,  //第22行char_line16=320'h7FFFFFFC00C0380000C0C0C00000300C300C01800018180803001808300C1808300C018018080000,  //第23行char_line17=320'h3801C00000C01C000180C0E00000180C300C01800010181803001818180C1818300C018018180000,  //第24行char_line18=320'h0001C00000C00F000300C07000001808300801803030181803001818180818182018018018180000,  //第25行char_line19=320'h0001C00000C0C7C00600C03000000C183018018030600C3003000C300C180C30201801800C300000,  //第26行char_line1a=320'h0001C00000C301FC0C00C03000000E30183003C030C00620030006200E300620183003C006200000,  //第27行char_line1b=320'h0001C00000DC00F81010C030000003E007C01FF80F8003C0030003C003E003C007C01FF803C00000,  //第28行char_line1c=320'h003FC00000F80010200FC00000000000000000000000000000000000000000000000000000000000,  //第29行char_line1d=320'h0007C00000E000000003C00000000000000000000000000000000000000000000000000000000000,  //第30行char_line1e=320'h00038000004000000001000000000000000000000000000000000000000000000000000000000000,  //第31行char_line1f=320'h00000000000000000000000000000000000000000000000000000000000000000000000000000000;  //第32行reg[8:0] char_bit;always@(posedge CLK_to_DAC)if(X==10'd144)char_bit<=9'd320;   //当显示到144像素时准备开始输出图像数据else if(X>10'd144&&X<10'd416)     //左边距屏幕144像素到416像素时    416=144+272（图像宽度）char_bit<=char_bit-1'b1;       //倒着输出图像信息 reg[29:0] vga_rgb;                //定义颜色缓存always@(posedge CLK_to_DAC) if(X>10'd144&&X<10'd416)    //X控制图像的横向显示边界：左边距屏幕左边144像素  右边界距屏幕左边界416像素begin case(Y)            //Y控制图像的纵向显示边界：从距离屏幕顶部160像素开始显示第一行数据10'd160:if(char_line00[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;  //如果该行有数据 则颜色为红色else vga_rgb<=30'b0000000000_0000000000_0000000000;                      //否则为黑色10'd162:if(char_line01[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd163:if(char_line02[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd164:if(char_line03[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd165:if(char_line04[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000; 10'd166:if(char_line05[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd167:if(char_line06[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000; 10'd168:if(char_line07[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd169:if(char_line08[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000; 10'd170:if(char_line09[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd171:if(char_line0a[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd172:if(char_line0b[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd173:if(char_line0c[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd174:if(char_line0d[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd175:if(char_line0e[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd176:if(char_line0f[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd177:if(char_line10[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd178:if(char_line11[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd179:if(char_line12[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd180:if(char_line13[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd181:if(char_line14[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd182:if(char_line15[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd183:if(char_line16[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd184:if(char_line17[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd185:if(char_line18[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd186:if(char_line19[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd187:if(char_line1a[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd188:if(char_line1b[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd189:if(char_line1c[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd190:if(char_line1d[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd191:if(char_line1e[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;10'd192:if(char_line1f[char_bit])vga_rgb<=30'b1111111111_0000000000_0000000000;else vga_rgb<=30'b0000000000_0000000000_0000000000;default:vga_rgb<=30'h0000000000;   //默认颜色黑色endcase endelse vga_rgb<=30'h000000000;             //否则黑色assign VGA_R=vga_rgb[23:16];assign VGA_G=vga_rgb[15:8];assign VGA_B=vga_rgb[7:0];
endmodule

3.彩条显示
具体代码如下

module data_drive (input         wire                        vga_clk,input           wire                        rst_n,input         wire        [ 11:0 ]        addr_h,input            wire        [ 11:0 ]        addr_v,input            wire        [ 2:0 ]      key,output         reg     [ 15:0 ]                rgb_data);localparam    red    = 16'd63488;
localparam  orange = 16'd64384;
localparam  yellow = 16'd65472;
localparam  green  = 16'd1024;
localparam  blue   = 16'd31;
localparam  indigo = 16'd18448;
localparam  purple = 16'd32784;
localparam  white  = 16'd65503;
localparam  black  = 16'd0;
reg [ 383:0 ] char_line[ 64:0 ];localparam  states_1 = 1; // 彩条
localparam  states_2 = 2; // 字符
localparam  states_3 = 3; // 图片parameter   height = 78; // 图片高度
parameter   width  = 128; // 图片宽度
reg         [ 1:0 ]         states_current          ; // 当前状态
reg         [ 1:0 ]         states_next             ; // 下个状态
reg         [ 13:0 ]        rom_address             ; // ROM地址
wire            [ 15:0 ]        rom_data                ; // 图片数据wire                           flag_enable_out1            ; // 文字有效区域
wire                            flag_enable_out2            ; // 图片有效区域
wire                            flag_clear_rom_address      ; // 地址清零
wire                            flag_begin_h                ; // 图片显示行
wire                            flag_begin_v                ; // 图片显示列//状态转移
always @( posedge vga_clk or negedge rst_n ) beginif ( !rst_n ) beginstates_current <= states_1;endelse beginstates_current <= states_next;end
end//状态判断
always @( posedge vga_clk or negedge rst_n ) beginif ( !rst_n ) beginstates_next <= states_1;endelse if ( key[ 0 ] ) beginstates_next <= states_1;endelse if ( key[ 1 ] ) beginstates_next <= states_2;endelse if ( key[ 2 ] ) beginstates_next <= states_3;endelse beginstates_next <= states_next;end
end//状态输出
always @( * ) begincase ( states_current )states_1 : beginif ( addr_h == 0 ) beginrgb_data = black;endelse if ( addr_h >0 && addr_h <81 ) beginrgb_data = red;endelse if ( addr_h >80 && addr_h <161 ) beginrgb_data = orange;endelse if ( addr_h >160 && addr_h <241 ) beginrgb_data = yellow;endelse if ( addr_h >240 && addr_h <321 ) beginrgb_data = green;endelse if ( addr_h >320 && addr_h <401 ) beginrgb_data = blue;endelse if ( addr_h >400 && addr_h <481 ) beginrgb_data = indigo;endelse if ( addr_h >480 && addr_h <561 ) beginrgb_data = purple;endelse if ( addr_h >560 && addr_h <641 ) beginrgb_data = white;endelse beginrgb_data = black;endendstates_2 : beginif ( flag_enable_out1 ) beginrgb_data = char_line[ addr_v-208 ][ 532 - addr_h ]? white:black;endelse beginrgb_data = black;endendstates_3 : beginif ( flag_enable_out2 ) beginrgb_data = rom_data;endelse beginrgb_data = black;endenddefault: begincase ( addr_h )0 : rgb_data      = black;1 : rgb_data      = red;81 : rgb_data     = orange;161: rgb_data     = yellow;241: rgb_data     = green;321: rgb_data     = blue;401: rgb_data     = indigo;481: rgb_data     = purple;561: rgb_data     = white;default: rgb_data = rgb_data;endcaseendendcase
endassign flag_enable_out1 = states_current == states_2 && addr_h > 148 && addr_h < 533 && addr_v > 208  && addr_v < 273 ;
assign flag_begin_h     = addr_h > ( ( 640 - width ) / 2 ) && addr_h < ( ( 640 - width ) / 2 ) + width + 1;
assign flag_begin_v     = addr_v > ( ( 480 - height )/2 ) && addr_v <( ( 480 - height )/2 ) + height + 1;
assign flag_enable_out2 = states_current == states_3 && flag_begin_h && flag_begin_v;//ROM地址计数器
always @( posedge vga_clk or negedge rst_n ) beginif ( !rst_n ) beginrom_address <= 0;endelse if ( flag_clear_rom_address ) begin //计数满清零rom_address <= 0;endelse if ( flag_enable_out2 ) begin  //在有效区域内+1rom_address <= rom_address + 1;endelse begin  //无效区域保持rom_address <= rom_address;end
end
assign flag_clear_rom_address = rom_address == height * width - 1;//初始化显示文字
always@( posedge vga_clk or negedge rst_n ) beginif ( !rst_n ) beginchar_line[ 0 ]  = 384'h000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000;char_line[ 1 ]  = 384'h000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000;char_line[ 2 ]  = 384'h000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000;char_line[ 3 ]  = 384'h000000000000000000000008000000000000000000000000000000000000000000000000000000000000200000800000;char_line[ 4 ]  = 384'h0000000001E000000000000E000000000000000000000000000000000002000000000000000000000000380000E00000;char_line[ 5 ]  = 384'h0000003000F800000000000780000000000000000000000000000000000F0000001000000000080000003E0000F80000;char_line[ 6 ]  = 384'h00000070007C000000000003C0000000000000000000000000000000007F8000000C000000001C0000003E0000FC0000;char_line[ 7 ]  = 384'h000000F8007E000000000003C000000000000000000000000000000003FFC000000FFFFFFFFFFE0000003C0000F00000;char_line[ 8 ]  = 384'h3FFFFFFC003E000000000003C00300000000000000000000000000003FFFE000000FFFFFFFFFFF0000003C0000F00000;char_line[ 9 ]  = 384'h3FFFFFFE003E000000000001C0078000000000000000000000000007FFFF8000000F000000003E0000003C0000F00000;char_line[ 10 ] = 384'h1F3E7C00003E0180001FFFFFFFFFC0000000000000000000000000FFFF800000000F000000003C0000003C0000F00000;char_line[ 11 ] = 384'h003E7C00001E03C0000FFFFFFFFFE000000000000000000000003FFFC0000000000F000000003C0000003C0000F00000;char_line[ 12 ] = 384'h003E7C00001C07E000000600010000000000000000000000001FFFC3C0000000000F000000003C0000003C3000F00600;char_line[ 13 ] = 384'h003E7C07FFFFFFF00000038003C00000000000000000000000300003C0000000000F000000003C0000003C7800F00F00;char_line[ 14 ] = 384'h003E7C07FFFFFFF8000001C003E00000000000000000000000000003C0000000000F000000003C0007FFFFFDFFFFFF80;char_line[ 15 ] = 384'h003E7C03EC006000000001E003C00000000000000000000000000003C0000000000F000000003C0003FFFFFEFFFFFFC0;char_line[ 16 ] = 384'h003E7C000F007800000000E007800000000000000000000000000003C0000000000F000000003C0001803C0001F80000;char_line[ 17 ] = 384'h003E7C601FC07E00000000E007000000000000000000000000000003C0000000000FFFFFFFFFFC0000007C0001FC0000;char_line[ 18 ] = 384'h0F3E7CF01F807E00000000E00E000200000000000000000000000003C0000000000FFFFFFFFFFC0000007C0003F40000;char_line[ 19 ] = 384'h0FFFFFF81F00FC00000000E00C000700000000000000000000000003C0000000000E000000003C000000FF8003F60000;char_line[ 20 ] = 384'h0FFFFFF81F00F8000000000018000F80000002000000000000000003C0000000000E000000003E000000FDF007F30000;char_line[ 21 ] = 384'h0FBE7DF03E00F8000FFFFFFFFFFFFFC0000001800000000000000003C0000000000E0000000030000001FCF80FF38000;char_line[ 22 ] = 384'h0FBE7DF03E01F00007FFFFFFFFFFFFE0000000C00000000000000003C0000000000E0000000000000003FC7C0EF1C000;char_line[ 23 ] = 384'h0FBE7DF03E01F8000300000000000000000000700000000000000003C0000000000E0000000000000003FC7C1EF1E000;char_line[ 24 ] = 384'h0FBE7DF07F83FC0000000000000000000000007C0000000000000003C0000000000E0000000000000007BC3C3CF0F000;char_line[ 25 ] = 384'h0FBE7DF07BE3FF0000000000000000000000003E0000000000000003C0000180000E000000000000000F3C1838F07C00;char_line[ 26 ] = 384'h0FBE7DF07BF7CFC000030000000700000000001F8000000000000003C00003C0000E000000003000001E3C1870F03F00;char_line[ 27 ] = 384'h0FBE7DF0F1F787E00003FFFFFFFF80000000000FC000000000000003C00007E0000E000000007800001C3C00E0F03FC0;char_line[ 28 ] = 384'h0FBE7DF0F1FF83E00003FFFFFFFFC00000000007F00000003FFFFFFFFFFFFFF0000E07FFFFFFFC0000383C01C0F01FF8;char_line[ 29 ] = 384'h0FBC7DF1E0FF03F00003C0000007000000000003F80000001FFFFFFFFFFFFFF8000E03FFFFFFFE0000703C0300F007E0;char_line[ 30 ] = 384'h0FBC7DF1E0FE01F00003C0000007000000000001FC0000000C000003C0000000000E01000000000000E03C0600F00300;char_line[ 31 ] = 384'h0FBC7DF3C07C01F00003C0000007000000000000FE00000000000003C0000000001E00000000000001803C2800F00100;char_line[ 32 ] = 384'h0FBC7DF3807800E00003C0000007000000000000FE00000000000003C0000000001E00000000000007003C3000F00000;char_line[ 33 ] = 384'h0FBC7DF7007000C00003FFFFFFFF0000000000007F00000000000003C0000000001E0000000000000C003C7800F00000;char_line[ 34 ] = 384'h0FF87DF700FC00000003FFFFFFFF0000000000003F00000000000003C0000000001E00000000000018003C7E00E00000;char_line[ 35 ] = 384'h0FF87FFE01FF00000003C00000070000000000003F00000000000003C0000000001E000000000100000030FC00808000;char_line[ 36 ] = 384'h0FF83FFC013F00000003C00000070000000000001F00000000000003C0000000001E000000000380000001F00001C000;char_line[ 37 ] = 384'h0FF01FF0003E00000003C00000070000000000001F00000000000003C0000000001C0000000007C0000003FFFFFFE000;char_line[ 38 ] = 384'h0FE001F0003E00C00003C00000070000000000000E00000000000003C0000000001CFFFFFFFFFFE0000003FFFFFFF000;char_line[ 39 ] = 384'h0FE001F0003E01E00003C00000070000000000000400000000000003C0000000001C7FFFFFFFFFF0000007800003F800;char_line[ 40 ] = 384'h0FC001F0003E03F00003FFFFFFFF0000000000000000000000000003C0000000001C20006000000000000F000003E000;char_line[ 41 ] = 384'h0F8001FFFFFFFFF80003FFFFFFFF0000000000000000000000000003C0000000003C00007000000000001E000007C000;char_line[ 42 ] = 384'h0F8001FFFFFFFFFC0003C02000070000000000000000000000000003C0000000003C0000FC00000000003C00000F8000;char_line[ 43 ] = 384'h0FFFFFF7C03E00000003801800060000000000000000000000000003C000000000380000FC00000000007E00001F0000;char_line[ 44 ] = 384'h0FFFFFF0003E00000000000E00000000000000000000000000000003C000000000380001F80000000000E780003E0000;char_line[ 45 ] = 384'h0F8001F0003E00000000100780000000000000000000000000000003C000000000380001E00000000001C3C0003E0000;char_line[ 46 ] = 384'h0F8001F0003E000000001C07C0018000000000000000000000000003C000000000780003C0000000000781F0007C0000;char_line[ 47 ] = 384'h0F8001F0003E000000081F03E000E000000000000000000000000003C00000000070000780000000000E00F800F80000;char_line[ 48 ] = 384'h0F8001F0003E000000181E01E0007800000000000000000000000003C00000000070000700180000001C007803F00000;char_line[ 49 ] = 384'h0F8001F0003E000000181C00E0183E00000000000000000000000003C00000000070000E000C00000070007807E00000;char_line[ 50 ] = 384'h0F8001F0003E000000181C00E0181F00000000000000000000000003C000000000E0001C0007000000C000380F800000;char_line[ 51 ] = 384'h0F8001F0003E000000381C0060180F80000000000000000000000003C000000000E0003800038000010000381F000000;char_line[ 52 ] = 384'h0F8001F0003E000000381C00401807C0000000000000000000000003C000000000C000700001E000000000187E000000;char_line[ 53 ] = 384'h0FFFFFF0003E000000701C00001807C0000000000000000000000003C000000001C000600001F00000000010F8000000;char_line[ 54 ] = 384'h0FFFFFF0003E000000F01C00001803C0000000000000000000000003C0000000018001C00000F80000000003F0000000;char_line[ 55 ] = 384'h0F8001F0003E000003F01C00001803C0000000000000000000000003C00000000380038000007C000000000FC0000000;char_line[ 56 ] = 384'h0F8001F0003E000003E01E00003C0180000000000000000000000003C000000003000700FFFFFE000000003F00000000;char_line[ 57 ] = 384'h0F8001F0003E000007E01FFFFFFE0000000000000000000000000003C000000006001FFFFFF03E00000001FC00000000;char_line[ 58 ] = 384'h0F8001F0003E000003800FFFFFFC0000000000000000000000000003C000000006000FFFE0001E0000000FF000000000;char_line[ 59 ] = 384'h0F8001E0003E0000000007FFFFF00000000000000000000000000003C00000000C000FF800001E000000FF8000000000;char_line[ 60 ] = 384'h0F000000003C00000000000000000000000000000000000000000003800000000800070000000E00000FF80000000000;char_line[ 61 ] = 384'h00000000003800000000000000000000000000000000000000000002000000001800040000000C0001FF000000000000;char_line[ 62 ] = 384'h000000000000000000000000000000000000000000000000000000000000000010000000000000000F80000000000000;char_line[ 63 ] = 384'h000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000;char_line[ 64 ] = 384'h000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000;end
end//实例化ROM
rom rom_inst (
.address ( rom_address ),
.clock ( vga_clk ),
.q ( rom_data )
);
endmodule // data_drive

总结

通过本次实验，我了解了vga相关技术及实现方法，相信在今后这些一定会对我有所帮助。

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