//Template
//Copy this template and name it "hw2.v".

// Problem 0:
// Write down your name and your  account  here
// Your Name :  #######
// Your Account: #######
//
//Problem 1:(10pts)

//Look at the memory modules below  and answer.
//The memory units contain data and operators.
// What will be printed?
//Answer: 
//(hint:   think about the example above)
// 

//Instruction Memory Module 
//Look at it and give an answer for the problem 1.

module instruction_memory();
      reg [3:0] mem [7:0];
      initial
      begin
      mem[0] = 1;     //add
      mem[1] = 1;     //add           
      mem[2] = 2;     //sub
      mem[3] = 4;     //print(end)          
      mem[4] = 2;     
      mem[5] = 2;               
      mem[6] = 2;
      mem[7] = 2;
      end
   endmodule
//Instruction Memory Module 

module data_memory();
      reg [7:0] mem [7:0];
      initial
      begin
      mem[0] = 15;     
      mem[1] = 12;                
      mem[2] = 11;     //
      mem[3] = 10;     //
      mem[4] =  8;     //
      mem[5] =  6;     //
      mem[6] =  4;
      mem[7] =  2;
      end
   endmodule
//Look at instruction_memory and data_memory, and give an answer for the problem 1.
//You don't have to understand this code.
//This module instruction_memory_read  will read  instruction from memory. 

module instruction_memory_read(v,ck);
      input ck;
      output [7:0] v;
      reg [7:0] v,local_v,index,cnt;
      instruction_memory i_m();
      initial index = 0;
      always @(ck)
      begin
          v = i_m.mem[index];
          index = index +1;
      end
endmodule


////////////////////////////////////////////////////// //////


//Problem 2   Complete the module so it can perform the required functionality(65pts).

module mini_processing_unit(v,ck);
       input ck;
       input [7:0] v;
       reg[7:0] data1,data2,result;
       reg[7:0] index;
       initial  index = 0;
       data_memory dm();

       always @(ck)
       begin
       #1;
  
       
/// Write down your code here
/// It should contain this code: $display("print value = %d\n",data1);
/// And this :                   #1 $stop;   //Why #1 before $stop?
                                //Answer: you give time to the simulator to do
                                //something before it stops.
/// The code length will be less than 30 lines. 

/// There will be no penalty for a little bit longer code 
//   as long as your program  produces right answer
//  You may declare more variables and use them.
//Hint  use    dm.mem[index] when you read data and write data to the data_memory.
//  for example
// data1 = dm.mem[index];
//dm.mem[index] = result;


end endmodule  //End of your solution for problem 2.
//////////////////////////////////////////////////////////////////////////////////
////////////////////////////Do not modify this test_all module////////////////////////////////////////////////////
module test_all();
   integer i,j;
    reg ck;
    wire [7:0] vs,vs2;


    
    initial  ck = 0;
    initial begin 
      
             for(i = 1; i<= 80; i = i+ 1) 
              begin
                 #10;
                 ck = ~ck;
              end
              end
            instruction_memory_read i_m_r(vs,ck);   
            mini_processing_unit m_p_u(vs,ck);
endmodule
// Problem 3: Convert the following numbers. (15pts)
//    3.1) Decimal     6      to 8-bit Binary: (2pts)
//     Write your answer here;
//    3.2) Decimal    -6      to 8-bit Binary (2pts)
//     Write your answer here: 
//    3.3) Decimal    6.875  to Binary (as many bits as needed) (3pts)
//     Write your answer here: 
//    3.4) Decimal   -6.875  to IEEE 754 Single Precision (8pts) 
//    (Show in hexadecimal): 
//   Write your answer here: