Subversion Repositories pepelatz_misc

//Pepelatz_main.v
//This file is the main module of Pepelatz MISC processor. All other modules of Pepelatz must have their own files.
//Please, comment all in detail.
 
 
//Module Pepelatz contains the processor root.
module Pepelatz
  (
  //ROM
    output[15:0]rom_address,//Address for ROM bus.
    input [15:0]rom_data,   //Data from ROM.
    input       rom_ready,  //Shows, that rom_data has actual value.
 
  //RAM
    output      ram_write,  //Turn on writing mode.
    output[15:0]ram_adress, //Address for RAM bus.
    output[15:0]ram_input,  //RAM's write port.
    input [15:0]ram_data,   //Data from RAM.
    input       ram_ready,  //Shows, that ram_data has actual value.
 
  //Operations
    input clk,              //Clock signal.
    input rst               //Reset signal.
  );
 
  //Output regs used by Verilog. (Just remember: you must create a register for each output)
   reg[15:0]rom_address;
   reg      ram_write;
   reg[15:0]ram_adress;
   reg[15:0]ram_input;
 
  //Processor regs
 
   //Arithmetic stack
    reg[5:0] StackPointer;
    reg[15:0]Stack[0:63];
   //Call stack
    reg[3:0]CallPointer;
    reg[15:0]CallStack[0:15];
   //Pointer to current command.
    reg[15:0]PC;
 
  //Dark regs
   reg[15:0] command;//command for decoding
   wire GetOperand;//if GetOperand==0 then get next command and place it into stack.
     assign GetOperand=command[0];
   //Set of wires to instructions
    wire [4:0]instruction0;
     assign instruction0=command[5:1];
    wire [4:0]instruction1;
     assign instruction1=command[11:6];
    wire [4:0]instruction2;
     assign instruction2=command[15:12];
    reg GetCommand;//if GetCommand=0, current command is not actual.
 
  always@(posedge clk)//Main block
   if (GetCommand==0) begin//Get command
     end else 
    if (GetOperand==1) begin
 
    end else begin
 
    end//always
 
  always@(posedge rst)//reset
    begin
     StackPointer=0;
     PC=0;
     CallPointer=0;
     GetCommand=0;
    end
endmodule//Pepelatz