Subversion Repositories hssdrc

//

// Project      : High-Speed SDRAM Controller with adaptive bank management and command pipeline

//

// Project Nick : HSSDRC

//

// Version      : 1.0-beta

//

// Revision     : $Revision: 1.1 $

//

// Date         : $Date: 2008-03-06 13:54:00 $

//

// Workfile     : sdram_tread_class.sv

//

// Description  : virtual sdram treads using for sdram chip testing

//

// HSSDRC is licensed under MIT License

//

// Copyright (c) 2007-2008, Denis V.Shekhalev (des00@opencores.org)

//

// Permission  is hereby granted, free of charge, to any person obtaining a copy of

// this  software  and  associated documentation files (the "Software"), to deal in

// the  Software  without  restriction,  including without limitation the rights to

// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

// the  Software, and to permit persons to whom the Software is furnished to do so,

// subject to the following conditions:

//

// The  above  copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS

// FOR  A  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR

// COPYRIGHT  HOLDERS  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER

// IN  AN  ACTION  OF  CONTRACT,  TORT  OR  OTHERWISE,  ARISING  FROM, OUT OF OR IN

// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

//

`include "tb_define.svh"

`ifndef __SDRAM_TREAD_CLASS_SV__

  `define __SDRAM_TREAD_CLASS_SV__

  class sdram_tread_class;

    sdram_tread_state_s_t active_tread_state [sdram_tread_ptr_t];

    rand sdram_tread_ptr_t curr_tread_num; // no need to constrant

    sdram_tread_ptr_t disable_tread_num [$];

    constraint select_tread { !(curr_tread_num inside {disable_tread_num}); }

    //

    //

    //

    function void Init () ;

      int tread_num     = 0;

      const int shift   = clogb2(cBaMaxValue);

      sdram_tread_state_s_t tread_state;

      if (active_tread_state.num != 0)

        active_tread_state.delete;

      if (disable_tread_num.size != 0)

        disable_tread_num = {};

      for (int rowa = 0; rowa < cRowaMaxValue; rowa++) begin

        for (int ba = 0; ba < cBaMaxValue; ba++) begin

        tread_num = (rowa << shift) + ba;

        tread_state = '{ba : ba, rowa : rowa, cola : 0};

        active_tread_state[tread_num] = tread_state;

        end

      end

    endfunction

    //

    //

    //

    function burst_t GetBurst (input sdram_tread_state_s_t tread_state);

      int max_burst;

      max_burst = cColaMaxValue - tread_state.cola;

      if (max_burst > cBurstMaxValue) max_burst = 16;

      assert (std::randomize(GetBurst) with {GetBurst inside {[1:max_burst]};})

        else $error ("burst generate error : max burst = %0d burst = %0d", max_burst, GetBurst );

    endfunction

  endclass

`endif