Rank.h

/*******************************************************************************
* Copyright (c) 2012-2014, The Microsystems Design Labratory (MDL)
* Department of Computer Science and Engineering, The Pennsylvania State University
* All rights reserved.
* 
* This source code is part of NVMain - A cycle accurate timing, bit accurate
* energy simulator for both volatile (e.g., DRAM) and non-volatile memory
* (e.g., PCRAM). The source code is free and you can redistribute and/or
* modify it by providing that the following conditions are met:
* 
*  1) Redistributions of source code must retain the above copyright notice,
*     this list of conditions and the following disclaimer.
* 
*  2) Redistributions in binary form must reproduce the above copyright notice,
*     this list of conditions and the following disclaimer in the documentation
*     and/or other materials provided with the distribution.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* 
* Author list: 
*   Matt Poremba    ( Email: mrp5060 at psu dot edu 
*                     Website: http://www.cse.psu.edu/~poremba/ )
*   Tao Zhang       ( Email: tzz106 at cse dot psu dot edu
*                     Website: http://www.cse.psu.edu/~tzz106 )
*******************************************************************************/

#ifndef __RANK_H__
#define __RANK_H__

#include <stdint.h>
#include <list>
#include "src/Bank.h"
#include "src/Params.h"
#include "src/NVMObject.h"
#include <iostream>

namespace NVM {

/*
 *  We use six rank states because our timing and energy parameters
 *  only tell us the delay of the entire read/write cycle to one bank.
 *  Even though all banks should be powered down in lockstep, we use three
 *  bank states to indicate different PowerDown modes. In addition, as all
 *  banks are powered up, some banks may be active directly according to
 *  different PowerDown states.
 *
 *  In the case of non-volatile memory, consecutive reads and writes do
 *  not need to consider the case when reads occur before tRAS, since
 *  data is not destroyed during read, and thus does not need to be
 *  written back to the row.
 */
enum RankState 
{ 
    RANK_UNKNOWN,   /***< Unknown state. Uh oh. */
    RANK_OPEN,      /***< Rank has at least one open bank  */
    RANK_CLOSED,    /***< all banks in the rank are closed (standby) */
    RANK_REFRESHING,/***< some banks in the rank are refreshing */
    RANK_PDPF,      /***< Rank is in precharge powered down, fast exit mode */
    RANK_PDA,       /***< Rank is in active powered down mode */
    RANK_PDPS       /***< Rank is in precharge powered down, slow exit mode */
};

class Rank : public NVMObject
{
  public:
    Rank( ) { }
    ~Rank( ) { }

    virtual void SetConfig( Config * /*c*/, bool /*createChildren*/ = true ) { }

    virtual bool Idle( );

};

};

#endif