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VLSI: 4 Bit Full Adder with Carry Select Dataflow Modelling with Testbench

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Verilog Code for 4 Bit Full Adder with Carry Select Dataflow Modelling

module FACS(
              input [3:0]x,cin,
              input [3:0]y,
              output [3:0]s,
    output cout,
    );
               //for carry '0'
               fa f0(a0,c0,0,x[0],y[0]);
               fa f1(a1,c1,c0,x[1],y[1]);
               fa f2(a2,c2,c1,x[2],y[2]);
               fa f3(a3,c3,c2,x[3],y[3]);
    //for carry '1'
               fa f4(a4,c4,1,x[0],y[0]);
               fa f5(a5,c5,c4,x[1],y[1]);
               fa f6(a6,c6,c5,x[2],y[2]);
               fa f7(a7,c7,c6,x[3],y[3]);
               //two:one MUX
              mux m0(s[0],cin,a0,a4);
              mux m1(s[1],cin,a1,a5);
              mux m2(s[2],cin,a2,a6);
              mux m3(s[3],cin,a3,a7);
              mux m4(cout,cin,c7,c3);
endmodule

//full adder
              module fa(sum,carry,a,b,c4);
              output sum,carry;
              input a,b,c4;
             
         assign p = (a^b);
assign r = a & b;
assign sum = p ^ c4;
assign q = p ^ c4;
assign carry = q ^ r;
endmodule

//mux
              module mux(
              output Y,
              input D0, D1, S, );
              assign T1 = D1 & S;
      assign T2  = D0 & Sbar;
              assign Sbar = ~ S;
              assign Y = T1 | T2;
endmodule

//Testbench code for 4 Bit Full Adder with Carry Select Dataflow Modelling

initial begin

                             // Initialize Inputs
                             x = 0;y = 0;cin = 0;
                             // Wait 100 ns for global reset to finish
                             #100;

                             // Add stimulus here
                             #100;x = 0;y = 0;cin = 1;
                             #100;x = 0;y = 1;cin = 0;
                             #100;x = 0;y = 1;cin = 1;
                             #100;x = 1;y = 0;cin = 0;
                             #100;x = 1;y = 0;cin = 1;
                             #100;x = 1;y = 1;cin = 0;
                             #100;x = 1;y = 1;cin = 1;
 end


Output:





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