[笔记]VGA Color Pattern Generator
一、Reset_Delay
module Reset_Delay(iCLK,oRESET); input iCLK; output reg oRESET; reg[19:0] Cont; always@(posedge iCLK) begin if(Cont!=20'hfffff) begin Cont<=Cont+1; oRESET<=1'b0; end else oRESET<=1'b1; end endmodule二、video_sync_generator
module video_sync_generator( input rst_n, input vga_clk, output reg vga_hs,vga_vs, output reg vga_blank_n, output valid, output [10:0] vga_xpos,vga_ypos ); //Generate the H-Sync & V-Sync reg[10:0] h_cnt; reg[10:0] v_cnt; always@(posedge vga_clk or negedge rst_n) begin if(!rst_n) begin h_cnt<=11'd0; v_cnt<=11'd0; end else begin if(h_cnt==H_TOTAL-1) begin h_cnt<=11'd0; if(v_cnt==V_TOTAL-1) v_cnt<=11'd0; else v_cnt<=v_cnt+11'd1; end else h_cnt<=h_cnt+11'd1; end end wire cHD,cVD,hori_valid,vert_valid,cDEN; assign cHD=(h_cnt<H_SYNC)?1'b0:1'b1; assign cVD=(v_cnt<V_SYNC)?1'b0:1'b1; assign hori_valid=(h_cnt<(H_TOTAL-H_FRONT) && h_cnt>=H_BACK)?1'b1:1'b0; assign vert_valid=(v_cnt<(V_TOTAL-V_FRONT) && v_cnt>=V_BACK)?1'b1:1'b0; assign cDEN=hori_valid && vert_valid; //Delay the iHD,iVD,iDEN for one clock cycle; always@(negedge vga_clk) begin vga_hs<=cHD; vga_vs<=cVD; vga_blank_n<=cDEN; end //Generate Valid, vga_xpos, vga_ypos assign valid=(h_cnt>=X_Start && h_cnt<X_Start+H_ACT && v_cnt>=Y_Start && v_cnt<Y_Start+V_ACT)?1'b1:1'b0; assign vga_xpos=valid?(h_cnt-X_Start):11'b0; assign vga_ypos=valid?(v_cnt-Y_Start):11'b0; //------------------------------------------------------- `define VGA_640_480_60FPS_25MHz //`define VGA_800_600_72FPS_50MHz //`define VGA_1024_768_60FPS_65MHz `ifdef VGA_640_480_60FPS_25MHz //Horizontal & Vertical Parameter parameter H_SYNC = 96; parameter H_BACK = 48; parameter H_ACT = 640; parameter H_FRONT= 16; parameter H_TOTAL= 800; parameter V_SYNC = 2; parameter V_BACK = 33; parameter V_ACT = 480; parameter V_FRONT= 10; parameter V_TOTAL= 525; //Start Offset parameter X_Start=H_SYNC+H_BACK; parameter Y_Start= V_SYNC+V_BACK; `endif `ifdef VGA_800_600_72FPS_50MHz //Horizontal & Vertical Parameter parameter H_SYNC = 120; parameter H_BACK = 64; parameter H_ACT = 800; parameter H_FRONT= 56; parameter H_TOTAL= 1040; parameter V_SYNC = 6; parameter V_BACK = 23; parameter V_ACT = 600; parameter V_FRONT= 37; parameter V_TOTAL= 666; //Start Offset parameter X_Start=H_SYNC+H_BACK+H_FRONT; parameter Y_Start= V_SYNC+V_BACK+V_FRONT; `endif `ifdef VGA_1024_768_60FPS_65MHz //Horizontal & Vertical Parameter parameter H_SYNC = 136; parameter H_BACK = 160; parameter H_ACT = 1024; parameter H_FRONT= 24; parameter H_TOTAL= 1344; parameter V_SYNC = 6; parameter V_BACK = 29; parameter V_ACT = 768; parameter V_FRONT= 3; parameter V_TOTAL= 806; //Start Offset parameter X_Start=H_SYNC+H_BACK+H_FRONT; parameter Y_Start= V_SYNC+V_BACK+V_FRONT; `endif //------------------------------------------------------- endmodule
三、video_disp_generator
module video_disp_generator #( parameter H_ACT = 10'd640, parameter V_ACT = 10'd480 ) ( input vga_clk, input rst_n, input[10:0] vga_xpos, input[10:0] vga_ypos, input valid, output reg[7:0] vga_r,vga_g,vga_b ); wire[21:0] vga_result=vga_xpos*vga_ypos; always@(posedge vga_clk or negedge rst_n) begin if(!rst_n) begin vga_r<=0; vga_g<=0; vga_b<=0; end else if(valid) {vga_r,vga_g,vga_b} <= vga_result; else {vga_r,vga_g,vga_b} <= 24'h000000; end /* always@(posedge vga_clk or negedge rst_n) begin if(!rst_n) begin vga_r<=0; vga_g<=0; vga_b<=0; end else if(valid) begin if (vga_xpos >= 0 && vga_xpos < (H_ACT>>3)) {vga_r,vga_g,vga_b} <= 24'hff0000; else if(vga_xpos >= (H_ACT>>3)*1 && vga_xpos < (H_ACT>>3)*2) {vga_r,vga_g,vga_b} <= 24'h00ff00; else if(vga_xpos >= (H_ACT>>3)*2 && vga_xpos < (H_ACT>>3)*3) {vga_r,vga_g,vga_b} <= 24'h0000ff; else if(vga_xpos >= (H_ACT>>3)*3 && vga_xpos < (H_ACT>>3)*4) {vga_r,vga_g,vga_b} <= 24'hffff00; else if(vga_xpos >= (H_ACT>>3)*4 && vga_xpos < (H_ACT>>3)*5) {vga_r,vga_g,vga_b} <= 24'h00ffff; else if(vga_xpos >= (H_ACT>>3)*5 && vga_xpos < (H_ACT>>3)*6) {vga_r,vga_g,vga_b} <= 24'hff00ff; else if(vga_xpos >= (H_ACT>>3)*6 && vga_xpos < (H_ACT>>3)*7) {vga_r,vga_g,vga_b} <= 24'hffffff; else// if(vga_xpos >= (H_ACT<<3)*7 && vga_xpos < (H_ACT<<3)*8) {vga_r,vga_g,vga_b} <= 24'hff0000; end end */ /* always@(posedge vga_clk or negedge rst_n) begin if(!rst_n) {vga_r,vga_g,vga_b}<=24'b0; else if(valid) begin if((vga_xpos>=0&&vga_xpos<640)&&(vga_ypos>=0&&vga_ypos<80)) {vga_r,vga_g,vga_b}<=24'hff0000; else if((vga_xpos>=0&&vga_xpos<640)&&(vga_ypos>=0&&vga_ypos<160)) {vga_r,vga_g,vga_b}<=24'h00ff00; else if((vga_xpos>=0&&vga_xpos<640)&&(vga_ypos>=160&&vga_ypos<240)) {vga_r,vga_g,vga_b}<=24'h0000ff; else if((vga_xpos>=0&&vga_xpos<640)&&(vga_ypos>=240&&vga_ypos<320)) {vga_r,vga_g,vga_b}<=24'hf0f0f0; else if((vga_xpos>=0&&vga_xpos<640)&&(vga_ypos>=320&&vga_ypos<400)) {vga_r,vga_g,vga_b}<=24'h0f0f0f; else if((vga_xpos>=0&&vga_xpos<640)&&(vga_ypos>=400&&vga_ypos<480)) {vga_r,vga_g,vga_b}<=24'hffffff; else {vga_r,vga_g,vga_b}<=24'h000000; end end */ endmodule
四、vga_controller
module vga_controller( input CLK_50,iRST_N, //VGA interface output VGA_HS,VGA_VS, output VGA_CLK, output VGA_BLANK_N, output VGA_SYNC_N, output[7:0] VGA_R,VGA_G,VGA_B ); assign VGA_SYNC_N=1'b0; //This pin is unused; wire DLY_RST; Reset_Delay r0( .iCLK(CLK_50), .oRESET(DLY_RST) ); pll pll_vga( .inclk0(CLK_50), .c0(VGA_CLK) ); video_sync_generator u1( .vga_clk(VGA_CLK), .rst_n(DLY_RST), .vga_hs(VGA_HS), .vga_vs(VGA_VS), .vga_blank_n(VGA_BLANK_N), .vga_xpos(vga_xpos), .vga_ypos(vga_ypos), .valid(valid) ); wire[10:0] vga_xpos,vga_ypos; wire valid; video_disp_generator u2( .vga_clk(VGA_CLK), .rst_n(DLY_RST), .vga_xpos(vga_xpos), .vga_ypos(vga_ypos), .valid(valid), .vga_r(VGA_R), .vga_g(VGA_G), .vga_b(VGA_B) ); endmodule
五、Color Pattern Display
posted on 2011-09-07 09:31 LiangXuan 阅读(1401) 评论(0) 编辑 收藏 举报