Class Dff

  extended byhades.simulator.SimObject
      extended byhades.models.flipflops.GenericFlipflop
          extended byhades.models.flipflops.Dff
All Implemented Interfaces:
Assignable, java.lang.Cloneable, ContextToolTip, java.io.Serializable, Simulatable
Direct Known Subclasses:

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
          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


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

Method Detail


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
evaluate in class SimObject
arg - an arbitrary object argument