# LAB 9
## NAME - AMAN ANAND
## ROLL NO - CS22B054

## QUESTION NO 1

module alu_with_four_operation(a,b,sel,c);
    parameter n = 4;
    wire [n-1:0] x1,x2,x3,x4;
    input [n-1:0] a;
    input [n-1:0] b;
    input [1:0] sel;
    output [n-1:0] c;
    assign x1 = a+b;
    assign x2 = a-b;
    assign x3 = a&&b; 
    assign x4 = a||b;
    multiplexer safygsf (x1,x2,x3,x4,sel,c);
endmodule
module multiplexer(x1,x2,x3,x4,sel,c);
    parameter n=4;
    input [n-1:0] x1,x2,x3,x4;
    input [1:0] sel;
    output [n-1:0] c;
    assign c = !sel[0]&!sel[1] ? x1 : sel[0]&!sel[1] ? x2 : !sel[0]&sel[1] ? x3: x4;
endmodule

testbench

module testBench_of_alu();
    reg [3:0]a,b;
    reg [1:0] sel;
    wire [3:0]c;
  alu_with_four_operation  fhuba (a,b,sel,c);
    
    initial 
        begin
    $display("here are few test cases ");       
    $monitor("a=%b,b=%b,sel=%b,c=%b",a,b,sel,c);
            a=4'b0111;  b=4'b0110;sel='b00;
       // #100	a=4'b0100;b=4'b0100;sel='b10;
        #100	a=4'b0010;b=4'b0100;sel='b01;
        #100	a=4'b0100;b=4'b0010;sel='b11;

        end
endmodule

## QUESTION 2
code of module processor

  module pro (input [7:0] ins,output reg [7:0] out);
 
  reg [7:0] mem [255:0];
  reg [7:0] register[15:0];
 reg sd;
  initial 
    begin
      mem[4]=8'b00000011;
      register[1] =8'b00000010;
    
    end
  assign sd= ins[7];
  reg [1:0] ds;
  reg [1:0] sr;
  reg [2:0] off;
  reg [7:0] loc;
  always @(*) begin
    case(sd) 
      1'b0: begin
        ds= ins[6:5];
        off= ins[4:2];
        sr=ins[1:0];
       loc= sr+ off;
        register[ds]= mem[loc];
        assign out = mem[loc];
      end
      1'b1: begin
         ds= ins[6:5];
        off= ins[4:2];
        sr=ins[1:0];
       loc= sr+ off;
        mem[loc]= register[ds];
                assign out = mem[loc];
      end
    endcase
    
  end
endmodule

code of test bench

     module tb ;
  reg [7:0] ins;
  wire [7:0] out;
  pro sjfn(ins,out);
  
  initial begin
    $display("aman ka code ");
    $monitor("out, %b", out);
 
    ins = 8'b01101101; #5//output is 00000011
 
    ins= 8'b10110011; #5 //output is 00000010
  
    $finish;
  end
endmodule 

## QUESTION 3

### inscount0.log

code

 


  #include<stdio.h> 
    
int main(){
    printf("Hello World!!");
}

output