[問題] verilog燒FPGA板out of range

[c871111116 (文子水交)]

剛剛寫了一個程式

總之就是用verilog然後連VGA到螢幕畫圖

可是不知道怎麼寫的

我燒到板子後螢幕出來的就是"out of range"這三個字一直跳動

可以請問一下這是什麼問題嗎

順便附上我的vga_control code

module VGA_control(
         input clk,
         input reset,
         output reg[10:0] vcounter,
         output reg[11:0] hcounter,
         output reg visible,
         output reg oHS,
         output reg oVS
    );


         always @ (posedge clk or posedge reset) begin
                if(reset) begin
                        hcounter<=0;
                        vcounter<=0;
                end
                else begin
                        hcounter<=hcounter+1;
                        if(hcounter==11'd800) begin
                                hcounter<=0;
                                vcounter<=vcounter+1;
                        end
                        if(vcounter==10'd525) begin
                                vcounter<=0;
                        end
                end
         end

         always @ (posedge clk or posedge reset) begin
                if(reset) begin
                        visible<=0;
                        oHS<=0;
                        oVS<=0;
                end
                else begin
                        if(hcounter>=11'd0 & hcounter<11'd640 & vcounter>=10'd0 &
vcounter<10'd480) begin
                                visible<=1;
                        end
                        else begin
                                visible<=0;
                        end
                        if(hcounter>=11'd656 & hcounter<11'd752) begin
                                oHS<=0;
                        end
                        else begin
                                oHS<=1;
                        end
                        if(vcounter>=10'd490 & vcounter<10'd492) begin
                                oVS<=0;
                        end
                        else begin
                                oVS<=1;
                        end
                end
         end



endmodule

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◆ From: 140.113.65.154
→ MOONRAKER:這不用玩過FPGA也知道吧
→ MOONRAKER:out of range表示(1)輸入信號掃描頻率超
→ MOONRAKER:過螢幕極限(2)**根本沒訊號**
→ MOONRAKER:不信你把你螢幕訊號線拔掉就是這樣
→ MOONRAKER:趕快拿示波器接VGA頭看一看吧
→ MOONRAKER:接哪幾頭你會比我清楚