112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
/*
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* ReadChecker.cpp
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*
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* Created on: Mar 13, 2014
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* Author: jonny
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*/
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#include "ReadChecker.h"
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#include "../../TimingCalculation.h"
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#include "../../../common/Utils.h"
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#include "WriteChecker.h"
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namespace core {
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void ReadChecker::delayToSatisfyConstraints(ScheduledCommand& command) const
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{
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sc_assert(command.getCommand() == Command::Read || command.getCommand() == Command::ReadA);
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delayToSatisfyDLL(command);
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ScheduledCommand lastCommand = state.getLastScheduledCommand(command.getBank());
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if (lastCommand.isValidCommand())
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{
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if (lastCommand.getCommand() == Command::Activate)
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{
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command.delayToMeetConstraint(lastCommand.getStart(), config.Timings.tRCD);
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}
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else if (lastCommand.getCommand() == Command::Read)
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{
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command.delayToMeetConstraint(lastCommand.getStart(), ReadChecker::readToRead(lastCommand,command));
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}
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else if (lastCommand.getCommand() == Command::Write)
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{
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command.delayToMeetConstraint(lastCommand.getStart(), ReadChecker::writeToRead(lastCommand, command));
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}
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else if (lastCommand.getCommand() == Command::PDNPX || lastCommand.getCommand() == Command::PDNAX)
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{
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command.delayToMeetConstraint(lastCommand.getStart(), config.Timings.tXP);
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}
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else
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reportFatal("Read Checker", "Read can not follow " + commandToString(lastCommand.getCommand()));
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}
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while (!state.bus.isFree(command.getStart()) || collidesOnDataStrobe(command))
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{
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command.delayStart(config.Timings.clk);
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}
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}
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bool ReadChecker::collidesOnDataStrobe(ScheduledCommand& read) const
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{
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for (ScheduledCommand& strobeCommand : state.lastDataStrobeCommands)
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{
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if (collidesWithStrobeCommand(read, strobeCommand))
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return true;
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}
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return false;
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}
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bool ReadChecker::collidesWithStrobeCommand(ScheduledCommand& read, ScheduledCommand& strobeCommand) const
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{
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if (strobeCommand.getCommand() == Command::Read || strobeCommand.getCommand() == Command::ReadA)
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{
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return getDistance(read.getStart(),strobeCommand.getStart()) < ReadChecker::readToRead(strobeCommand,read);
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}
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else if (strobeCommand.getCommand() == Command::Write || strobeCommand.getCommand() == Command::WriteA)
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{
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if (strobeCommand.getStart() >= read.getStart())
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return getDistance(read.getStart(), strobeCommand.getStart()) < WriteChecker::readToWrite(read,strobeCommand);
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else
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return getDistance(strobeCommand.getStart(), read.getStart()) < ReadChecker::writeToRead(strobeCommand, read);
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}
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else
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{
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reportFatal("Read Checker",
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"Invalid strobeCommand in data strobe commands " + commandToString(strobeCommand.getCommand()));
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return true;
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}
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}
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void ReadChecker::delayToSatisfyDLL(ScheduledCommand& read) const
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{
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ScheduledCommand lastSREFX = state.getLastCommand(Command::SREFX, read.getBank());
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if (lastSREFX.isValidCommand())
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read.delayToMeetConstraint(lastSREFX.getStart(), config.Timings.tXSRDLL);
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}
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sc_time ReadChecker::readToRead(ScheduledCommand& firstRead, ScheduledCommand& secondRead)
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{
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sc_assert(firstRead.getCommand() == Command::Read || firstRead.getCommand() == Command::ReadA);
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sc_assert(secondRead.getCommand() == Command::Read || secondRead.getCommand() == Command::ReadA);
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TimingConfiguration& config = Configuration::getInstance().Timings;
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sc_time tCCD = (firstRead.getBankGroup() == secondRead.getBankGroup()) ? config.tCCD_L : config.tCCD_S;
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return max(tCCD, getReadAccessTime());
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}
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sc_time ReadChecker::writeToRead(ScheduledCommand& write, ScheduledCommand& read)
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{
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sc_assert(read.getCommand() == Command::Read || read.getCommand() == Command::ReadA);
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sc_assert(write.getCommand() == Command::Write || write.getCommand() == Command::WriteA);
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TimingConfiguration& config = Configuration::getInstance().Timings;
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sc_time tWTR = (write.getBankGroup() == read.getBankGroup()) ? config.tWTR_L : config.tWTR_S;
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return config.tWL + getWriteAccessTime() + tWTR;
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}
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} /* namespace controller */
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