Arch.SM213.Machine
Class AbstractSM213CPU

java.lang.Object
  java.util.Observable
      Machine.AbstractCPU
          Arch.SM213.Machine.AbstractSM213CPU

Direct Known Subclasses:

CPU

public abstract class AbstractSM213CPU
extends AbstractCPU

Nested Class Summary

Nested classes/interfaces inherited from class Machine.AbstractCPU

AbstractCPU.InvalidInstructionException, AbstractCPU.MachineHaltException

Field Summary

protected Register	curInst
protected Register	insOp0
protected Register	insOp1
protected Register	insOp2
protected Register	insOpCode
protected Register	insOpExt
protected Register	insOpImm
protected Register	instruction
protected Register	pc
protected RegisterSet	ps

Fields inherited from class Machine.AbstractCPU

CURRENT_INSTRUCTION_ADDRESS, isInterrupt, mem, PC, processorState, reg

Constructor Summary

AbstractSM213CPU(AbstractMainMemory aMem)

Method Summary

protected void	cycle() Computes one cycle of the SM213 CPU
protected abstract void	execute() Impemented by STUDENTS to execute instruction currently loaded in processorState registers.
protected abstract void	fetch() Implemented by STUDENTS to fetch next instruction from memory into CPU processorState registers.
void	setPC(int aPC) Set PC to value

Methods inherited from class Machine.AbstractCPU

getMainMemory, getName, getPC, getProcessorState, getRegisterFile, start, triggerInterrupt

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ps

protected RegisterSet ps

pc

protected Register pc

instruction

protected Register instruction

insOpCode

protected Register insOpCode

insOp0

protected Register insOp0

insOp1

protected Register insOp1

insOp2

protected Register insOp2

insOpImm

protected Register insOpImm

insOpExt

protected Register insOpExt

curInst

protected Register curInst

Constructor Detail

AbstractSM213CPU

public AbstractSM213CPU(AbstractMainMemory aMem)

Method Detail

cycle

protected void cycle()
              throws AbstractCPU.InvalidInstructionException,
                     AbstractCPU.MachineHaltException,
                     AbstractMainMemory.InvalidAddressException

Computes one cycle of the SM213 CPU

Specified by:

cycle in class AbstractCPU

Throws:

AbstractCPU.InvalidInstructionException

AbstractCPU.MachineHaltException

AbstractMainMemory.InvalidAddressException

setPC

public void setPC(int aPC)

Description copied from class: AbstractCPU

Set PC to value

Overrides:

setPC in class AbstractCPU

fetch

protected abstract void fetch()
                       throws AbstractMainMemory.InvalidAddressException

Implemented by STUDENTS to fetch next instruction from memory into CPU processorState registers.

Throws:

AbstractMainMemory.InvalidAddressException

execute

protected abstract void execute()
                         throws AbstractCPU.InvalidInstructionException,
                                AbstractCPU.MachineHaltException,
                                RegisterSet.InvalidRegisterNumberException,
                                AbstractMainMemory.InvalidAddressException

Impemented by STUDENTS to execute instruction currently loaded in processorState registers.

Throws:

AbstractCPU.InvalidInstructionException

AbstractCPU.MachineHaltException

RegisterSet.InvalidRegisterNumberException

AbstractMainMemory.InvalidAddressException