4 bit full adder in verilog

icaniwill said:

i need to make a 4 bit full adder using verilog can anybody please help me?

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module   full_adder_4bit(
    cin,
    cout,
    in_a,
    in_b,
    sum
    );
    
    parameter   reg_size = 4;
    
    input   cin;
    input   [reg_size-1:0] in_a;
    input   [reg_size-1:0] in_b;
    output  [reg_size-1:0] sum;
    output  cout;
    
    assign   {cout,sum} = in_a + in_b + cin;
    
endmodule

malikmuhammadali said:

This is code is for an simple asynchronous
wrapping n-bit adder. By changing the value
of n you can make it a 2, 4, … bit adder
where n = <number of bits> - 1. f is the output register that will have the current value of the counter, cOut is the carry output. a & b are the number inputs and cIn is the carry input. Both the number outputs and inputs are set by the value of n so you can add two n-bit numbers and a carry bit then get an n-bit number plus carry bit ou




module nBitAdder(f, cOut, a, b, cIn);
parameter n = 7;

output reg [n:0] f;
output reg cOut;
input [n:0] a;
input [n:0] b;
input cIn;

always @(a, b, cIn)
{cOut, f} = a + b + cIn;
endmodule

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