machine
Class Register.TimingException

java.lang.Object
  java.lang.Throwable
      java.lang.Exception
          util.UserVisibleException
              machine.Register.TimingException

All Implemented Interfaces:

Serializable

Enclosing class:

Register

public class Register.TimingException
extends UserVisibleException

Indicates that CPU implementation has read from the register's input port, but no value was written to that port. Often indicates a deadlock in the pipelined implementation. This exception is an artifact of the mapping of truely parallel hardware to the partically-sequential software model. In software, each pipeline stage is a sequential piece of code, but the stages themselves are executed in parallel, each in their own thread. It is thus acceptable for one stage to read a register's input as long as that stage has already written to it in this cycle or if another stage will.

See Also:

Serialized Form

Constructor Summary

Register.TimingException()

Register.TimingException(int aPC)

Method Summary

Methods inherited from class util.UserVisibleException

getMessage, setPC

Methods inherited from class java.lang.Throwable

fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Register.TimingException

public Register.TimingException()

Register.TimingException

public Register.TimingException(int aPC)