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我正在尝试使用 verilog 在我的 baysis2 FGPA 上创建一个简单的 4 位密码系统。我想使用 7 段显示器来显示输入的数字（将使用键盘输入）。现在我只是在测试以确保输入正确的数字。问题是，七段显示器的第一个数字不亮，而其他所有数字都亮。我已经在多个板上进行了尝试，并且所有其他由同一根电线启用的数字都很好。为什么会这样？

module enter_password(
    input wire clk, reset,
    input wire ps2d, ps2c, rx_en,
    output wire [6:0]  seven_seg_display,
    output wire assert_seg);

    wire [7:0] scan_out;
    wire [7:0] ascii_code;

    //initial seven_seg_display = 7'b0000000;

    assign assert_seg = 1'b1;

    // instantiate ps2 receiver
    ps2_rx ps2_rx_unit(
      .clk(clk), .reset(reset), .rx_en(1'b1),
      .ps2d(ps2d), .ps2c(ps2c),
      .rx_done_tick(scan_done_tick), .dout(scan_out));

    // instantiate key-to-ascii code conversion circuit
    Scan_to_ascii key2ascii(.key_code(scan_out), .ascii_code(ascii_code));

    assign seven_seg_display =  
       ascii_code == 8'h30 ? 7'b0000001: //0
       ascii_code == 8'h31 ? 7'b1001111: //1
       ascii_code == 8'h32 ? 7'b0010010: //2
       ascii_code == 8'h33 ? 7'b0000110: //3
       ascii_code == 8'h34 ? 7'b1001100: //4
       ascii_code == 8'h35 ? 7'b0100100: //5
       ascii_code == 8'h36 ? 7'b0100000: //6
       ascii_code == 8'h37 ? 7'b0001111: //7
       ascii_code == 8'h38 ? 7'b0000000: //8
       ascii_code == 8'h39 ? 7'b0000100: //9
                             7'b1111111; //e for error 0
endmodule

ucf

NET "seven_seg_display[6]" LOC = "L14"; # Bank = 1, Signal name = CA
NET "seven_seg_display[5]" LOC = "H12"; # Bank = 1, Signal name = CB
NET "seven_seg_display[4]" LOC = "N14"; # Bank = 1, Signal name = CC
NET "seven_seg_display[3]" LOC = "N11"; # Bank = 2, Signal name = CD
NET "seven_seg_display[2]" LOC = "P12"; # Bank = 2, Signal name = CE
NET "seven_seg_display[1]" LOC = "L13"; # Bank = 1, Signal name = CF
NET "seven_seg_display[0]" LOC = "M12"; # Bank = 1, Signal name = CG
#NET "dp" LOC = "N13"; # Bank = 1, Signal name = DP

NET "assert_seg" LOC = "K14"; # Bank = 1, Signal name = AN3
NET "assert_seg" LOC = "M13"; # Bank = 1, Signal name = AN2
NET "assert_seg" LOC = "J12"; # Bank = 1, Signal name = AN1
NET "assert_seg" LOC = "F12"; # Bank = 1, Signal name = AN0
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1 回答 1

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问题是，七段显示器的第一个数字不亮，而其他所有数字都亮。

我假设您的七段显示器中有两位数字，因此您需要14-bit seven_seg_display从enter_password模块中输出

改变

    output wire [6:0]  seven_seg_display,

至

    output wire [13:0]  seven_seg_display,

您可能还必须更改以下代码的逻辑以支持 a14-bit seven_seg_display和多路复用器以确定seven_seg_display将ascii_code分配哪一半：

    assign seven_seg_display =  
       ascii_code == 8'h30 ? 7'b0000001: //0
       ascii_code == 8'h31 ? 7'b1001111: //1
       ascii_code == 8'h32 ? 7'b0010010: //2
       ascii_code == 8'h33 ? 7'b0000110: //3
       ascii_code == 8'h34 ? 7'b1001100: //4
       ascii_code == 8'h35 ? 7'b0100100: //5
       ascii_code == 8'h36 ? 7'b0100000: //6
       ascii_code == 8'h37 ? 7'b0001111: //7
       ascii_code == 8'h38 ? 7'b0000000: //8
       ascii_code == 8'h39 ? 7'b0000100: //9
                             7'b1111111; //e for error 0
于 2015-11-26T02:51:09.167 回答