Package ptolemy.actor.lib.vhdl
Class RegisterSR
- java.lang.Object
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- All Implemented Interfaces:
java.lang.Cloneable
,Actor
,Executable
,FiringsRecordable
,Initializable
,TypedActor
,Changeable
,Debuggable
,DebugListener
,Derivable
,Instantiable
,ModelErrorHandler
,MoMLExportable
,Moveable
,Nameable
public class RegisterSR extends SynchronousFixTransformer
This actor provides a one-tick delay. On each firing, it produces on the output port whatever value it read on the input port in the previous tick of the clock. If the input was absent on the previous tick of the clock, then the output will be absent. On the first tick, the output is initialValue if it is given, and absent otherwise. In contrast to the Pre actor, this actor is non-strict, and hence can break causality loops. Whereas Pre provides a one-step delay of non-absent values, this actor simply delays by one clock tick.- Since:
- Ptolemy II 2.0
- Version:
- $Id$
- Author:
- Paul Whitaker, Elaine Cheong, and Edward A. Lee
- See Also:
Pre
,SampleDelay
,TimedDelay
- Pt.AcceptedRating:
- Yellow (cxh)
- Pt.ProposedRating:
- Yellow (celaine)
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Nested Class Summary
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Nested classes/interfaces inherited from class ptolemy.kernel.Entity
Entity.ContainedObjectsIterator
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Field Summary
Fields Modifier and Type Field Description TypedIOPort
input
The input port.-
Fields inherited from class ptolemy.actor.lib.vhdl.SynchronousFixTransformer
initialValue, latency
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Fields inherited from class ptolemy.actor.lib.vhdl.FixTransformer
output
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Fields inherited from class ptolemy.actor.TypedAtomicActor
_typesValid
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Fields inherited from class ptolemy.actor.AtomicActor
_actorFiringListeners, _initializables, _notifyingActorFiring, _stopRequested
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Fields inherited from class ptolemy.kernel.util.NamedObj
_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _deferChangeRequests, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS
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Fields inherited from interface ptolemy.actor.Executable
COMPLETED, NOT_READY, STOP_ITERATING
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Constructor Summary
Constructors Constructor Description RegisterSR(CompositeEntity container, java.lang.String name)
Construct an actor in the specified container with the specified name.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
fire()
If the input known and there is a token on the input port, consume the token from the input port, and store it for output on the next iteration.void
preinitialize()
Override the base class to declare that the input port does not depend on the output in a firing.-
Methods inherited from class ptolemy.actor.lib.vhdl.SynchronousFixTransformer
attributeChanged, initialize, isStrict
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Methods inherited from class ptolemy.actor.lib.vhdl.FixTransformer
_checkFixMaxValue, _checkFixTokenWidth, _setAndHideQuantizationParameters, _setQuantizationParameters, _showQuantizationParameters, getPortPrecision, newFixOutputPort, sendOutput
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Methods inherited from class ptolemy.actor.TypedAtomicActor
_containedTypeConstraints, _customTypeConstraints, _defaultTypeConstraints, _fireAt, _fireAt, attributeTypeChanged, clone, clone, isBackwardTypeInferenceEnabled, newPort, typeConstraintList, typeConstraints
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Methods inherited from class ptolemy.actor.AtomicActor
_actorFiring, _actorFiring, _declareDelayDependency, addActorFiringListener, addInitializable, connectionsChanged, createReceivers, declareDelayDependency, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, isFireFunctional, iterate, newReceiver, outputPortList, postfire, prefire, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate, wrapup
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Methods inherited from class ptolemy.kernel.ComponentEntity
_adjustDeferrals, _checkContainer, _getContainedObject, _propagateExistence, getContainer, instantiate, isAtomic, isOpaque, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, setName
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Methods inherited from class ptolemy.kernel.Entity
_addPort, _description, _exportMoMLContents, _removePort, _validateSettables, connectedPortList, connectedPorts, containedObjectsIterator, getAttribute, getPort, getPorts, linkedRelationList, linkedRelations, portList, removeAllPorts, setClassDefinition, uniqueName
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Methods inherited from class ptolemy.kernel.InstantiableNamedObj
_setParent, exportMoML, getChildren, getElementName, getParent, getPrototypeList, isClassDefinition, isWithinClassDefinition
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Methods inherited from class ptolemy.kernel.util.NamedObj
_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _containedDecorators, _copyChangeRequestList, _debug, _debug, _debug, _debug, _debug, _executeChangeRequests, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _notifyHierarchyListenersAfterChange, _notifyHierarchyListenersBeforeChange, _propagateValue, _removeAttribute, _splitName, _stripNumericSuffix, addChangeListener, addDebugListener, addHierarchyListener, attributeDeleted, attributeList, attributeList, decorators, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttributes, getChangeListeners, getClassName, getDecoratorAttribute, getDecoratorAttributes, getDerivedLevel, getDerivedList, getDisplayName, getFullName, getModelErrorHandler, getName, getName, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, lazyContainedObjectsIterator, message, notifyOfNameChange, propagateValue, propagateValues, removeAttribute, removeChangeListener, removeDebugListener, removeHierarchyListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, validateSettables, workspace
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Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface ptolemy.actor.Actor
createReceivers, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, newReceiver, outputPortList
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Methods inherited from interface ptolemy.kernel.util.Derivable
getDerivedLevel, getDerivedList, propagateValue
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Methods inherited from interface ptolemy.actor.Executable
isFireFunctional, iterate, postfire, prefire, stop, stopFire, terminate
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Methods inherited from interface ptolemy.actor.Initializable
addInitializable, removeInitializable, wrapup
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Methods inherited from interface ptolemy.kernel.util.Nameable
description, getContainer, getDisplayName, getFullName, getName, getName, setName
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Field Detail
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input
public TypedIOPort input
The input port. The default type is Fix.
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Constructor Detail
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RegisterSR
public RegisterSR(CompositeEntity container, java.lang.String name) throws IllegalActionException, NameDuplicationException
Construct an actor in the specified container with the specified name.- Parameters:
container
- The container.name
- The name of this actor within the container.- Throws:
IllegalActionException
- If the actor cannot be contained by the proposed container.NameDuplicationException
- If the name coincides with an actor already in the container.
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Method Detail
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fire
public void fire() throws IllegalActionException
If the input known and there is a token on the input port, consume the token from the input port, and store it for output on the next iteration. Otherwise, store an AbsentToken for output on the next iteration. If a token was received on the previous iteration, output it to the receivers. Otherwise, notify the receivers that there will never be any token available in the current iteration.- Specified by:
fire
in interfaceExecutable
- Overrides:
fire
in classAtomicActor<TypedIOPort>
- Throws:
IllegalActionException
- If there is no director.
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preinitialize
public void preinitialize() throws IllegalActionException
Override the base class to declare that the input port does not depend on the output in a firing.- Specified by:
preinitialize
in interfaceInitializable
- Overrides:
preinitialize
in classSynchronousFixTransformer
- Throws:
IllegalActionException
- Not thrown in this base class.
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