write Verilog code to implement 16-bit ripple carry adder using Full adders. Use Testbench to validate your design by adding two numbers like 2(2=0000000000000010) and 3(3=0000000000000011)

The following Verilog code creates Full adder circuit using Half adder blocks: module full_adder(x,y,ci,s,co); input x, y, ci; output s, co; wire w1, w2, w3; half_adder HA1(x, y, w1, w2); //instance 1 of Half Adder half_adder HA2(ci, w1, s, w3); //instance 2 of Half Adder or(co, w3, w2); endmodule

Then to build a 4-bit ripple carry adder you have to create 4 instances of the above block or circuit. As shown below: module adder4 (cin, x3, x2, x1, x0, y3, y2, y1, y0, s3, s2, s1, s0, cout); input cin, x3, x2, x1, x0, y3, y2, y1, y0; output s3, s2, s1, s0, cout; full_add stage0 (x0, y0,cin, s0, c1); full_add stage1 (x1, y1,c1, s1, c2); full_add stage2 (x2, y2, c2, s2, c3); full_add stage3 (x3, y3,c3, s3, cout); endmodule