Exp 1.docx

EXP 1 RCA HALF ADDER USING OPERATORS Source code module ha_operator(a,b,s,c); input a,b; output s,c; assign s=a^b; assign c=a&b; endmodule Testbench module ha_operator_tb(); reg a,b; wire s,c; ha_operator d(a,b,s,c); initial begin a=1'b0;b=1'b0; #10 a=1'b0;b=1'b1; #10 a=1'b1;b=1'b0; #10 a=1'b1;b=1'b1; #10 $finish; end endmodule Waveform:

full adder

Source code module fa(a,b,cin,s,cout); input a,b,cin; output s,cout; wire w1,w2,w3; ha_operator a1(a,b,w1,w3), a2(w1,cin,s,w2); or o1(cout,w2,w3); endmodule

testbench module fa_tb(); reg a,b,cin; wire s,cout; fa f1(a,b,cin,s,cout); initial begin {a,b,cin}=3'b000; #10 {a,b,cin}=3'b001; #10 {a,b,cin}=3'b010; #10 {a,b,cin}=3'b011; #10 {a,b,cin}=3'b100; #10 {a,b,cin}=3'b101; #10 {a,b,cin}=3'b110; #10 {a,b,cin}=3'b111; #10 $finish; end endmodule waveform

4bit RCA Souce code module rca_4bit(a,b,cin,s,cout); input [3:0]a,b; input cin; output [3:0]s; output cout; wire w1,w2,w3; fa f1(a[0],b[0],cin,s[0],w1), f2(a[1],b[1],w1,s[1],w2), f3(a[2],b[2],w2,s[2],w3), f4(a[3],b[3],w3,s[3],cout); endmodule

testbench code module rca_4bit_tb(); reg [3:0]a,b; reg cin; wire [3:0]s; wire cout; rca_4bit r1(a,b,cin,s,cout); initial begin a=$random;b=$random;cin=$random; #10 a=$random;b=$random;cin=$random; #10 a=$random;b=$random;cin=$random; #10 a=$random;b=$random;cin=$random; #10 $finish; end endmodule

waveform

Rca using generate

Sourcecode module rcagenerate(a,b,cin,s,cout); parameter n=4; input [n-1:0] a,b; input cin; output [n-1:0] s; output cout; wire [n:0] c; assign c[0]=cin; genvar i; generate for(i=0; i
Testbench code

module rca_generate_tb(); reg [3:0]a,b; reg cin;

wire [3:0]s; wire cout; rcagenerate r1(a,b,cin,s,cout); initial begin a=$random;b=$random;cin=$random; #10 a=$random;b=$random;cin=$random; #10 a=$random;b=$random;cin=$random; #10 a=$random;b=$random;cin=$random; #10 $finish; end endmodule

Waveform of testbench