Subversion Repositories qaz_libs

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////                                                              ////
//// Copyright (C) 2015 Authors and OPENCORES.ORG                 ////
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//////////////////////////////////////////////////////////////////////


package axi4_transaction_pkg;

  // --------------------------------------------------------------------
  //
  class axi4_delay_class;

    rand int unsigned delay;


    // --------------------------------------------------------------------
    //
    function int unsigned
      next;

      assert(this.randomize() with{delay dist {0 := 40, [1:3] := 40, [4:7] := 20};});
      return(delay);

    endfunction: next


  // --------------------------------------------------------------------
  //
  endclass: axi4_delay_class


  // --------------------------------------------------------------------
  //
  class axi4_payload_class #(N = 8);

    rand logic [(8*N)-1:0]  w[];


    // --------------------------------------------------------------------
    //
    function
      new
      (
        logic [7:0] len = 0
      );

      this.w  = new[len + 1];

    endfunction: new


    // --------------------------------------------------------------------
    //
    function void
      random
      (
        logic [7:0] len = 0
      );

      this.w = new[len + 1];
      assert(this.randomize());

    endfunction: random


  // --------------------------------------------------------------------
  //
  endclass: axi4_payload_class


  // --------------------------------------------------------------------
  //
  class axi4_transaction_class #(A = 32, N = 8, I = 1);

    axi4_delay_class delay_h;
    axi4_payload_class #(.N(N)) payload_h;
    axi4_payload_class #(.N(N)) data_h;
    rand logic [(A-1):0]    addr = 'bz;
    rand logic [1:0]        burst = 2'b01;
    rand logic [7:0]        len = 0;
    rand logic [2:0]        size = $clog2(N);
    rand logic [(I-1):0]    id = 0;
    rand logic [1:0]        resp = 0;

    logic [3:0] cache   = 0;
    logic       lock    = 0;
    logic [2:0] prot    = 0;
    logic [3:0] qos     = 0;
    logic [3:0] region  = 0;

    constraint default_len
    {
      len dist {0 := 40, [1:15] := 40, [16:255] := 20};
    }


    // --------------------------------------------------------------------
    //
    function
      new
      (
        logic [7:0] len = 0
      );

      this.payload_h  = new(len + 1);
      this.delay_h    = new;

    endfunction: new


    // --------------------------------------------------------------------
    //
    function void
      basic_random;

      assert(this.randomize() with
      {
        this.id == 0;
        this.resp == 0;
        this.burst == 2'b01;
        this.len == 0;
        this.size == $clog2(N);
      });

      this.payload_h.random(this.len);

    endfunction: basic_random


    // --------------------------------------------------------------------
    //
    function void
      basic_random_burst;

      assert(this.randomize() with
      {
        this.addr[$clog2(N*8)-1:0] == 0;
        this.id == 0;
        this.resp == 0;
        this.burst == 2'b01;
        this.size == $clog2(N);
        this.len dist {0 := 40, [1:3] := 40, [4:15] := 20};
      });

      this.payload_h.random(this.len);

    endfunction: basic_random_burst


    // --------------------------------------------------------------------
    //
    function void
      basic_read
      (
        logic [(A-1):0] addr,
        logic [7:0] len = 0
      );

      this.id = 0;
      this.resp = 0;
      this.burst = 2'b01;
      this.size = $clog2(N);
      this.addr = addr;
      this.len = len;
      this.payload_h.random(len);

    endfunction: basic_read


    // --------------------------------------------------------------------
    //
    function void
      basic_write
      (
        logic [(A-1):0] addr,
        logic [7:0] len = 0
      );

      this.id = 0;
      this.resp = 0;
      this.burst = 2'b01;
      this.size = $clog2(N);
      this.addr = addr;
      this.len = len;
      this.payload_h.random(len);

    endfunction: basic_write


    // --------------------------------------------------------------------
    //
    function void copy
    (
      axi4_transaction_class #(.A(A), .N(N), .I(I)) from
    );

      this.addr     = from.addr;
      this.burst    = from.burst;
      this.len      = from.len;
      this.size     = from.size;
      this.id       = from.id;
      this.resp     = from.resp;
      this.cache    = from.cache;
      this.lock     = from.lock;
      this.prot     = from.prot;
      this.qos      = from.qos;
      this.region   = from.region;

    endfunction: copy


    // --------------------------------------------------------------------
    //
    virtual function axi4_transaction_class #(.A(A), .N(N), .I(I)) clone;

      clone = new();
      clone.copy(this);
      return(clone);

    endfunction: clone


  // --------------------------------------------------------------------
  //
  endclass: axi4_transaction_class


// --------------------------------------------------------------------
//
endpackage: axi4_transaction_pkg