instruction_memory.v

 `timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 09/28/2017 12:31:14  AM
// Design Name: 
// Module Name: instruction_memory
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 -  File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module instruction_memory(


	address,
	instruction
);
        //input port
	input [31:0] address;
	
        //output port
        output [31:0] instruction;

      
    //We have 256 (32 bit) locations where we can store the instructions which are to be executed and is given by instruction_memory
    reg	[31:0] instruction_memory [255:0];
	
    //The readmh function reads the hexadecimal numbers from the file program.mips and maps them into instruction_memory
    
	initial
	begin
		$readmemh("program.mips",instruction_memory);
	end
    
    //The assign instruction, gives the variable instruction the data which is present in the instruction_memory at one location out of the possible 256. 
    
	assign instruction = instruction_memory[address[9:2]];
	
 endmodule