# Lab 10
Name: I.Kalyan Anudeep
Roll No.: CS22B025

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## Question 1

**Code** (if required)

module halfadder(
        input a,b,
        output sum,carry
);
assign sum = a^b;
assign carry = a&b;
endmodule

module fulladder(
        input a,b,cin,
        output sum,carry
);
wire s,c,c1;
halfadder HA0(a,b,s,c);
halfadder HA1(cin,s,sum,c1);
assign carry = c | c1;
endmodule

module bitripplecarryadderSubtractor(
        input [7:0] A,B,
        input cin,con,
        output [7:0] Sum,
        output cout
);

        wire c1,c2,c3,c4,c5,c6,c7;
        FullAdder FA0(A[0],B[0]^con,cin,Sum[0],c1);
        FullAdder FA1(A[1],B[1]^con,c1,Sum[1],c2);
        FullAdder FA2(A[2],B[2]^con,c2,Sum[2],c3);
        FullAdder FA3(A[3],B[3]^con,c3,Sum[3],c4);
        FullAdder FA4(A[4],B[4]^con,cin,Sum[4],c5);
        FullAdder FA5(A[5],B[5]^con,c1,Sum[5],c6);
        FullAdder FA6(A[5],B[6]^con,c2,Sum[6],c7);
        FullAdder FA7(A[7],B[7]^con,c3,Sum[7],cout);
endmodule
module ripplecarry(
        input [31:0] a,b,
        input cin,con,
        output [31:0] sum,
        output cout
);
wire [7:0] i1,i2,i3,i4,j1,j2,j3,j4,k1,k2,k3,k4;
wire c1,c2,c3,c4;
assign i1=A[7:0];
assign i2=A[15:8];
assign i3=A[23:16];
assign i4=A[31:24];
assign j1=B[7:0];
assign j2=B[15:8];
assign j3=B[23:16];
assign j4=B[31:24];
bitripplecarryadderSubtractor BS1(i1,j1,cin,con,k1,c1);
bitripplecarryadderSubtractor BS2(i2,j2,c1,con,k2,c2);
bitripplecarryadderSubtractor BS3(i3,j3,c2,con,k3,c3);
bitripplecarryadderSubtractor BS4(i4,j4,c3,con,k4,cout);
assign sum={k4,k3,k2,k1};
endmodule

module oring(
        input[7:0] a,b,
        output[7:0] c
);
        c[0]=a[0]|b[0];
        c[1]=a[1]|b[1];
        c[2]=a[2]|b[2];
        c[3]=a[3]|b[3];
        c[4]=a[4]|b[4];
        c[5]=a[5]|b[5];
        c[6]=a[6]|b[6];
        c[7]=a[7]|b[7];
endmodule

module ororing(
        input[31:0]a,b,
        output[31:0]c
);
wire [7:0] i1,i2,i3,i4,j1,j2,j3,j4,k1,k2,k3,k4;
wire c1,c2,c3,c4;
assign i1=A[7:0];
assign i2=A[15:8];
assign i3=A[23:16];
assign i4=A[31:24];
assign j1=B[7:0];
assign j2=B[15:8];
assign j3=B[23:16];
assign j4=B[31:24];
oring OR1(i1,j1,k1);
oring OR2(i2,j2,k2);
oring OR3(i3,j3,k3);
oring OR4(i4,j4,k4);
assign c={k1,k2,k3,k4};
endmodule

module anding(
        input[7:0] a,b,
        output[7:0] c
);
        c[0]=a[0]&b[0];
        c[1]=a[1]&b[1];
        c[2]=a[2]&b[2];
        c[3]=a[3]&b[3];
        c[4]=a[4]&b[4];
        c[5]=a[5]&b[5];
        c[6]=a[6]&b[6];
        c[7]=a[7]&b[7];
endmodule

module andanding(
        input[31:0]a,b,
        output[31:0]c
);
wire [7:0] i1,i2,i3,i4,j1,j2,j3,j4,k1,k2,k3,k4;
wire c1,c2,c3,c4;
assign i1=A[7:0];
assign i2=A[15:8];
assign i3=A[23:16];
assign i4=A[31:24];
assign j1=B[7:0];
assign j2=B[15:8];
assign j3=B[23:16];
assign j4=B[31:24];
anding AND1(i1,j1,k1);
anding AND2(i2,j2,k2);
anding AND3(i3,j3,k3);
anding AND4(i4,j4,k4);
assign c={k1,k2,k3,k4};
endmodule


module xoring(
        input[7:0] a,b,
        output[7:0] c
);
        c[0]=a[0]^b[0];
        c[1]=a[1]^b[1];
        c[2]=a[2]^b[2];
        c[3]=a[3]^b[3];
        c[4]=a[4]^b[4];
        c[5]=a[5]^b[5];
        c[6]=a[6]^b[6];
        c[7]=a[7]^b[7];
endmodule

module xorxoring(
        input[31:0]a,b,
        output[31:0]c
);
wire [7:0] i1,i2,i3,i4,j1,j2,j3,j4,k1,k2,k3,k4;
wire c1,c2,c3,c4;
assign i1=A[7:0];
assign i2=A[15:8];
assign i3=A[23:16];
assign i4=A[31:24];
assign j1=B[7:0];
assign j2=B[15:8];
assign j3=B[23:16];
assign j4=B[31:24];
xoring XOR1(i1,j1,k1);
xoring XOR2(i2,j2,k2);
xoring XOR3(i3,j3,k3);
xoring XOR4(i4,j4,k4);
assign c={k1,k2,k3,k4};
endmodule

module ALU(input [31:0] a,b,
  input cin,cout,
           input [2:0] c,
    output reg result[31:0] );

always @(*)
begin
case(c)
       3'b000:ripplecarry(a,b,cin,0,result,cout);
                3'b001:ripplecarry(a,b,cin,1,result,cout);
                3'b010:xorxoring(a,b,result);
                3'b011:andanding(a,b,result);
                3'b100:ororing(a,b,result);
        endcase
end
endmodule

_You can use either one of these according to the question_

**1 a**
Code of ALU implemented above

**1 b**
Your answer

**1 c**
Your answer

**Observation:** (if required)
This is where you will write your observations
* Line 1
* Line 2
* Line3

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