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