hades.models.register
Class ShiftRegister

java.lang.Object
  hades.simulator.SimObject
      hades.models.register.Register
          hades.models.register.ShiftRegister

All Implemented Interfaces:

java.lang.Cloneable, ContextToolTip, java.io.Serializable, Simulatable

public class ShiftRegister

extends Register

ShiftRegister - a simple subclass of Register that models a n-bit rising-edge triggered, editable D-register with reset and right-shift. Signals are expected to be StdLogic1164 objects.

See Also:

Serialized Form

Field Summary

protected Port	port_NR
protected Port	port_SE
protected Port	port_Sin
protected Port	port_Sout

Fields inherited from class hades.models.register.Register

data, display, h, labels, n_bits, port_C, t_pass, t_setup, value_0, value_1, value_U, value_X, w

Fields inherited from class hades.simulator.SimObject

classloader, console, debug, editor, name, parent, ports, propertySheet, simulator, symbol, versionId, visible

Constructor Summary

ShiftRegister()
construct an rising-edge triggered, editable D-ShiftRegister with low- active reset input, using a default width of 4 bits.

Method Summary

SimObject	copy() copy(): This function is used to create a clone of the current SimObject.
protected void	createGlobalPortSymbols()
void	evaluate(java.lang.Object arg) evaluate(): called by the simulation engine on all events that concern this object.
protected void	initPortsAndData() the internal utility method to create the array of ports and flipflop values, corresponding to the desired bit-width specified by the global variable n_bits.
java.lang.String	toString() toString() - the usual info method

Methods inherited from class hades.models.register.Register

addDisplayElementsToSymbol, configure, constructDynamicSymbol, elaborate, getBitWidth, getDefaultBitWidth, getPassTime, initDisplay, initialize, mousePressed, needsDynamicSymbol, removeDisplayElementsFromSymbol, schedule, setBitWidth, setBitWidth, setPassTime, setPassTime, setSymbol, show, showDInputPorts, write

Methods inherited from class hades.simulator.SimObject

getBindkey, getClassLoader, getDebug, getEditor, getExternalResources, getFullName, getName, getParent, getPort, getPorts, getPropertySheet, getResourceAsStream, getSimulator, getSymbol, getSymbolResourceName, getToolTip, getVersionId, isVisible, keyPressed, message, needsExternalResources, setClassLoader, setConsole, setDebug, setEditor, setName, setParent, setPorts, setSimulator, setVersionId, setVisible, tearDown

Methods inherited from class java.lang.Object

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

Methods inherited from interface hades.simulator.Simulatable

message

Field Detail

port_NR

protected Port port_NR

port_SE

protected Port port_SE

port_Sin

protected Port port_Sin

port_Sout

protected Port port_Sout

Constructor Detail

ShiftRegister

public ShiftRegister()

construct an rising-edge triggered, editable D-ShiftRegister with low- active reset input, using a default width of 4 bits.

The width can be changed later in the 'initialize' method or interactively using the 'PropertySheet' dialog.

Method Detail

initPortsAndData

protected void initPortsAndData()

the internal utility method to create the array of ports and flipflop values, corresponding to the desired bit-width specified by the global variable n_bits.

A register uses n_bits inputs, n_bits outputs, one clock, one reset, one shift-enable, one shift-in inputs, and one shift-out output.

Overrides:

initPortsAndData in class Register

createGlobalPortSymbols

protected void createGlobalPortSymbols()

Overrides:

createGlobalPortSymbols in class Register

evaluate

public void evaluate(java.lang.Object arg)

evaluate(): called by the simulation engine on all events that concern this object. The object is responsible for updating its internal state and for scheduling all pending output events.

Specified by:

evaluate in interface Simulatable

Overrides:

evaluate in class Register

copy

public SimObject copy()

Description copied from class: SimObject

copy(): This function is used to create a clone of the current SimObject.

I am not yet sure about the correct and best semantic for copy(). Currently a new object of the current class is created by calling the default constructor.

Overrides:

copy in class Register

toString

public java.lang.String toString()

toString() - the usual info method

Overrides:

toString in class Register