hades.models.flipflops
Class Dff

java.lang.Object
  hades.simulator.SimObject
      hades.models.flipflops.GenericFlipflop
          hades.models.flipflops.Dff

All Implemented Interfaces:

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

Direct Known Subclasses:

DffRtlib

public class Dff

extends GenericFlipflop

implements Simulatable, java.io.Serializable

Dff: a rising-edge triggered D-flipflop. Signals are expected to be StdLogic1164 objects.

See Also:

Serialized Form

Field Summary

Fields inherited from class hades.models.flipflops.GenericFlipflop

port_NQ, port_Q, t_hold, t_pass, t_setup

Fields inherited from class hades.simulator.SimObject

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

Constructor Summary

Dff()
create an edge-triggered D-flipflop with default timing parameters

Method Summary

void	evaluate(java.lang.Object arg) evaluate: calculate Q and NQ from D and C inputs.

Methods inherited from class hades.models.flipflops.GenericFlipflop

assign, configure, elaborate, getDelay, getHoldTime, getSetupTime, getToolTip, initialize, scheduleEvent, scheduleEventAfter, scheduleOutputValue, scheduleOutputValueAfter, setDelay, setDelay, setHoldTime, setHoldTime, setSetupTime, setSetupTime, write

Methods inherited from class hades.simulator.SimObject

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface hades.simulator.Simulatable

elaborate, message

Constructor Detail

Dff

public Dff()

create an edge-triggered D-flipflop with default timing parameters

Method Detail

evaluate

public void evaluate(java.lang.Object arg)

evaluate: calculate Q and NQ from D and C inputs. Check for a rising-edge on the clock input and propagate the D input. Undefined inputs on D and C will result in 'X' output values. This flipflop checks for setup- or hold-times and will generate 'X' output values for Q and NQ if violations are detected.

Specified by:

evaluate in interface Simulatable

Overrides:

evaluate in class SimObject

Parameters:

arg - an arbitrary object argument