/*
 * Copyright (c) 2019, Technische Universität Kaiserslautern
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided 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.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * 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: Lukas Steiner
 */

#include "CheckerDDR3.h"

#include "DRAMSys/common/DebugManager.h"

#include <algorithm>

using namespace sc_core;
using namespace tlm;

CheckerDDR3::CheckerDDR3(const Configuration& config)
{
    memSpec = dynamic_cast<const MemSpecDDR3 *>(config.memSpec.get());
    if (memSpec == nullptr)
        SC_REPORT_FATAL("CheckerDDR3", "Wrong MemSpec chosen");

    lastScheduledByCommandAndBank = std::vector<std::vector<sc_time>>
            (Command::numberOfCommands(), std::vector<sc_time>(memSpec->banksPerChannel, sc_max_time()));
    lastScheduledByCommandAndRank = std::vector<std::vector<sc_time>>
            (Command::numberOfCommands(), std::vector<sc_time>(memSpec->ranksPerChannel, sc_max_time()));
    lastScheduledByCommand = std::vector<sc_time>(Command::numberOfCommands(), sc_max_time());
    lastCommandOnBus = sc_max_time();
    last4Activates = std::vector<std::queue<sc_time>>(memSpec->ranksPerChannel);

    tBURST = memSpec->defaultBurstLength / memSpec->dataRate * memSpec->tCK;
    tRDWR = memSpec->tRL + tBURST + 2 * memSpec->tCK - memSpec->tWL;
    tRDWR_R = memSpec->tRL + tBURST + memSpec->tRTRS - memSpec->tWL;
    tWRRD = memSpec->tWL + tBURST + memSpec->tWTR - memSpec->tAL;
    tWRRD_R = memSpec->tWL + tBURST + memSpec->tRTRS - memSpec->tRL;
    tWRPRE = memSpec->tWL + tBURST + memSpec->tWR;
    tRDPDEN = memSpec->tRL + tBURST + memSpec->tCK;
    tWRPDEN = memSpec->tWL + tBURST + memSpec->tWR;
    tWRAPDEN = memSpec->tWL + tBURST + memSpec->tWR + memSpec->tCK;
}

sc_time CheckerDDR3::timeToSatisfyConstraints(Command command, const tlm_generic_payload& payload) const
{
    Rank rank = ControllerExtension::getRank(payload);
    Bank bank = ControllerExtension::getBank(payload);

    sc_time lastCommandStart;
    sc_time earliestTimeToStart = sc_time_stamp();

    if (command == Command::RD || command == Command::RDA)
    {
        assert(ControllerExtension::getBurstLength(payload) == 8);

        lastCommandStart = lastScheduledByCommandAndBank[Command::ACT][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRCD - memSpec->tAL);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RD][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCCD);

        lastCommandStart = lastScheduledByCommand[Command::RD] != lastScheduledByCommandAndRank[Command::RD][rank.ID()] ? lastScheduledByCommand[Command::RD] : sc_max_time();
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tBURST + memSpec->tRTRS);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCCD);

        lastCommandStart = lastScheduledByCommand[Command::RDA] != lastScheduledByCommandAndRank[Command::RDA][rank.ID()] ? lastScheduledByCommand[Command::RDA] : sc_max_time();
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tBURST + memSpec->tRTRS);

        if (command == Command::RDA)
        {
            lastCommandStart = lastScheduledByCommandAndBank[Command::WR][bank.ID()];
            if (lastCommandStart != sc_max_time())
                earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPRE - memSpec->tRTP - memSpec->tAL);
        }

        lastCommandStart = lastScheduledByCommandAndRank[Command::WR][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRRD);

        lastCommandStart = lastScheduledByCommand[Command::WR];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRRD_R);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRRD);

        lastCommandStart = lastScheduledByCommand[Command::WRA];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRRD_R);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEX][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXSDLL);
    }
    else if (command == Command::WR || command == Command::WRA)
    {
        assert(ControllerExtension::getBurstLength(payload) == 8);

        lastCommandStart = lastScheduledByCommandAndBank[Command::ACT][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRCD - memSpec->tAL);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RD][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDWR);

        lastCommandStart = lastScheduledByCommand[Command::RD] != lastScheduledByCommandAndRank[Command::RD][rank.ID()] ? lastScheduledByCommand[Command::RD] : sc_max_time();
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDWR_R);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDWR);

        lastCommandStart = lastScheduledByCommand[Command::RDA] != lastScheduledByCommandAndRank[Command::RDA][rank.ID()] ? lastScheduledByCommand[Command::RDA] : sc_max_time();
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDWR_R);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WR][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCCD);

        lastCommandStart = lastScheduledByCommand[Command::WR] != lastScheduledByCommandAndRank[Command::WR][rank.ID()] ? lastScheduledByCommand[Command::WR] : sc_max_time();
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tBURST + memSpec->tRTRS);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCCD);

        lastCommandStart = lastScheduledByCommand[Command::WRA] != lastScheduledByCommandAndRank[Command::WRA][rank.ID()] ? lastScheduledByCommand[Command::WRA] : sc_max_time();
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tBURST + memSpec->tRTRS);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEX][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXSDLL);
    }
    else if (command == Command::ACT)
    {
        lastCommandStart = lastScheduledByCommandAndBank[Command::ACT][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRC);

        lastCommandStart = lastScheduledByCommandAndRank[Command::ACT][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRRD);

        lastCommandStart = lastScheduledByCommandAndBank[Command::RDA][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tAL + memSpec->tRTP + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndBank[Command::WRA][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPRE + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndBank[Command::PREPB][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXP][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::REFAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRFC);

        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEX][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXS);

        if (last4Activates[rank.ID()].size() >= 4)
            earliestTimeToStart = std::max(earliestTimeToStart, last4Activates[rank.ID()].front() + memSpec->tFAW);
    }
    else if (command == Command::PREPB)
    {
        lastCommandStart = lastScheduledByCommandAndBank[Command::ACT][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRAS);

        lastCommandStart = lastScheduledByCommandAndBank[Command::RD][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tAL + memSpec->tRTP);

        lastCommandStart = lastScheduledByCommandAndBank[Command::WR][bank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPRE);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);
    }
    else if (command == Command::PREAB)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::ACT][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRAS);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RD][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tAL + memSpec->tRTP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tAL + memSpec->tRTP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WR][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPRE);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPRE);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);
    }
    else if (command == Command::REFAB)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::ACT][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRC);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tAL + memSpec->tRTP + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPRE + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREPB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXP][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::REFAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRFC);

        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEX][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXS);
    }
    else if (command == Command::PDEA)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::ACT][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tACTPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RD][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WR][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRAPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREPB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tPRPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCKE);
    }
    else if (command == Command::PDXA)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::PDEA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tPD);
    }
    else if (command == Command::PDEP)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::RD][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tRDPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + tWRAPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREPB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tPRPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tPRPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXP][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCKE);

        lastCommandStart = lastScheduledByCommandAndRank[Command::REFAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tREFPDEN);

        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEX][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXS);
    }
    else if (command == Command::PDXP)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::PDEP][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tPD);
    }
    else if (command == Command::SREFEN)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::ACT][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRC);

        lastCommandStart = lastScheduledByCommandAndRank[Command::RDA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + std::max(tRDPDEN, memSpec->tAL + memSpec->tRTP + memSpec->tRP));

        lastCommandStart = lastScheduledByCommandAndRank[Command::WRA][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + std::max(tWRAPDEN, tWRPRE + memSpec->tRP));

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREPB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PREAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::PDXP][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXP);

        lastCommandStart = lastScheduledByCommandAndRank[Command::REFAB][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tRFC);

        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEX][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tXS);
    }
    else if (command == Command::SREFEX)
    {
        lastCommandStart = lastScheduledByCommandAndRank[Command::SREFEN][rank.ID()];
        if (lastCommandStart != sc_max_time())
            earliestTimeToStart = std::max(earliestTimeToStart, lastCommandStart + memSpec->tCKESR);
    }
    else
        SC_REPORT_FATAL("CheckerDDR3", "Unknown command!");

    if (lastCommandOnBus != sc_max_time())
        earliestTimeToStart = std::max(earliestTimeToStart, lastCommandOnBus + memSpec->tCK);

    return earliestTimeToStart;
}

void CheckerDDR3::insert(Command command, const tlm_generic_payload& payload)
{
    Rank rank = ControllerExtension::getRank(payload);
    Bank bank = ControllerExtension::getBank(payload);

    PRINTDEBUGMESSAGE("CheckerDDR3", "Changing state on bank " + std::to_string(bank.ID())
                      + " command is " + command.toString());

    lastScheduledByCommandAndRank[command][rank.ID()] = sc_time_stamp();
    lastScheduledByCommandAndBank[command][bank.ID()] = sc_time_stamp();
    lastScheduledByCommand[command] = sc_time_stamp();

    lastCommandOnBus = sc_time_stamp();

    if (command == Command::ACT)
    {
        if (last4Activates[rank.ID()].size() == 4)
            last4Activates[rank.ID()].pop();
        last4Activates[rank.ID()].push(sc_time_stamp());
    }
}
