BCD to 7-segment display converter Verilog code

BCD to 7-segment display converter:

An Electronic display device used for for displaying decimal numbers is called 7-segment display (SSD).

 

A Seven-segment display (SSD) has seven segments and theoretically it can display 2⁷ i-e 128 combinations of characters.

 fpga verilog code example

Here is an example of Verilog code for a BCD (Binary-Coded Decimal) to 7-segment display converter:

 

Seven segment display Code:

 

//Verilog module.
module segment7(
     bcd,
     seg
    );
     
     //Declare inputs,outputs and internal variables.
     input [3:0] bcd;
     output [6:0] seg;
     reg [6:0] seg;

//always block for conversion of BCD digits into 7-segment format
    always @(bcd)
    begin
        case (bcd) //case statement
            0 : seg = 7'b0000001;
            1 : seg = 7'b1001111;
            2 : seg = 7'b0010010;
            3 : seg = 7'b0000110;
            4 : seg = 7'b1001100;
            5 : seg = 7'b0100100;
            6 : seg = 7'b0100000;
            7 : seg = 7'b0001111;
            8 : seg = 7'b0000000;
            9 : seg = 7'b0000100;
            //switch off 7-segment characters when the BCD digits are not decimal numbers.
            default : seg = 7'b1111111; 
        endcase
    end
    
endmodule

 

Testbench:

 

module tb_segment7;

    reg [3:0] bcd;
    wire [6:0] seg;
    integer i;

    // incarnate the Unit Under Test (UUT)
    segment7 uut (
        .bcd(bcd), 
        .seg(seg)
    );

//Apply inputs
    initial begin
        for(i = 0;i < 16;i = i+1) //run loop for 0 to 15.
        begin
            bcd = i; 
            #10; //wait for 10 ns
        end     
    end
      
endmodule

 

This code defines a module called "segment7" that converts a 4-bit BCD input (bcd) to a 7-bit output for a 7-segment display (seg). The BCD to 7-segment conversion is done in the always block with the case statement. Each case statement assigns the output value of the 7-segment display based on the value of the BCD input.

Please note that this is just a basic example, and the actual code will depend on the specific requirements of your application, the type of 7-segment display you are using and the type of BCD input you are using.

The output will be the segments of the 7-segment display. The seven segment displays are common cathode or common anode, so the outputs will be inverted in case of common cathode or not inverted if it is common anode.