simulatorfaultydelayle.java

Java遗传算法库

/*
 * SimulatorFaultyDelayLE.java
 *
 * Created on 16 January 2002, 00:33
 */

package jaga.pj.circuits.fpgaft;

import jaga.pj.circuits.SimulatorLogicElement;
import jaga.pj.circuits.SimulatorDelayLE;

/** Extend this class to make Logic Elements with efficient fault modelling.
 *
 * For now only models SSA faults at output or input.  Only a single input can be failing 
 * at any moment.
 *
 * @author  Michael Garvie
 * @version 
 */
public class SimulatorFaultyDelayLE extends SimulatorDelayLE
{
    /** Defines if this element has a Single Stuck At Fault. */
    public boolean SSA = false;
    /** If it has a SSA fault, what it's stuck at. */
    public boolean SSAV;
    
    public SimulatorLogicElement faultyInput = null;
    public int faultyInputIndex = -1;
    
    public void setFault( int faultID )
    {
        switch( faultID )
        {
            case FTLib.NOFAULT:
                SSA = false;
                if( faultyInputIndex >= 0 )
                {
                    // Might be more efficient to always do this instead of putting in if statement...
                    inputs[ faultyInputIndex ] = faultyInput;
                    faultyInput = null;
                    faultyInputIndex = -1;
                }
                break;
            case FTLib.SSAV0:
                SSAV = false;
                SSA = true;
                currentOutput = SSAV;
                break;
            case FTLib.SSAV1:
                SSAV = true;
                SSA = true;
                currentOutput = SSAV;
                break;
            default:
                // Fault is at gate input
                faultyInputIndex = faultID / 2 - 1;
                int stuckAtInt = faultID % 2;
                boolean stuckAt = stuckAtInt == 1;
                
                faultyInput = inputs[ faultyInputIndex ];
                inputs[ faultyInputIndex ] = new SimulatorFaultyDelayLE( 0 );
                inputs[ faultyInputIndex ].setNow( stuckAt ); // and will never be refreshed
                break;
        }
    }
    
    /** Creates new SimulatorFaultyDelayLE */
    public SimulatorFaultyDelayLE(int delay) {
        super( delay );
    }
    
    public final boolean getNow( )
    {
        if( SSA )
        {
            return SSAV;
        }else
        {
            return currentOutput; // or super.getNow();
        }
    }

}