analyzer is able to analyse sequential circuits build with JK-FF and T-FF as far as they are connected directly to a single clock.

src/main/java/de/neemann/digital/analyse/AnalyseException.java

@@ -14,4 +14,13 @@ public class AnalyseException extends Exception {
     public AnalyseException(String message) {
         super(message);
     }
+
+    /**
+     * Creates a new instance
+     *
+     * @param e the cause
+     */
+    public AnalyseException(Exception e) {
+        super(e);
+    }
 }

src/main/java/de/neemann/digital/analyse/ModelAnalyser.java

@@ -3,7 +3,14 @@ package de.neemann.digital.analyse;
 import de.neemann.digital.analyse.expression.BitSetter;
 import de.neemann.digital.analyse.quinemc.BoolTableIntArray;
 import de.neemann.digital.core.*;
+import de.neemann.digital.core.basic.And;
+import de.neemann.digital.core.basic.Not;
+import de.neemann.digital.core.basic.Or;
+import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.flipflops.FlipflopD;
+import de.neemann.digital.core.flipflops.FlipflopJK;
+import de.neemann.digital.core.flipflops.FlipflopT;
+import de.neemann.digital.core.wiring.Clock;
 import de.neemann.digital.lang.Lang;
 
 import java.util.ArrayList;
@@ -30,6 +37,14 @@ public class ModelAnalyser {
      */
     public ModelAnalyser(Model model) throws AnalyseException {
         this.model = model;
+
+        try {
+            replaceJKFF();
+            replaceTFF();
+        } catch (NodeException e) {
+            throw new AnalyseException(e);
+        }
+
         inputs = checkBinary(model.getInputs());
         outputs = checkBinary(model.getOutputs());
 
@@ -40,6 +55,7 @@ public class ModelAnalyser {
         int i = 0;
         List<FlipflopD> flipflops = model.findNode(FlipflopD.class);
         for (FlipflopD ff : flipflops) {
+            checkClock(ff);
             ff.getDInput().removeObserver(ff); // turn off flipflop
             String label = ff.getLabel();
             if (label.length() == 0)
@@ -66,6 +82,18 @@ public class ModelAnalyser {
         rows = 1 << inputs.size();
     }
 
+    private void checkClock(Node node) throws AnalyseException {
+        if (!getClock().hasObserver(node))
+            throw new AnalyseException(Lang.get("err_ffNeedsToBeConnectedToClock"));
+    }
+
+    private ObservableValue getClock() throws AnalyseException {
+        ArrayList<Clock> clocks = model.getClocks();
+        if (clocks.size() != 1)
+            throw new AnalyseException(Lang.get("err_aSingleClockNecessary"));
+        return clocks.get(0).getClockOutput();
+    }
+
     private ArrayList<Signal> checkBinary(ArrayList<Signal> list) throws AnalyseException {
         for (Signal s : list)
             if (s.getValue().getBits() != 1)
@@ -111,4 +139,63 @@ public class ModelAnalyser {
         return tt;
     }
 
+    private void replaceJKFF() throws NodeException, AnalyseException {
+        List<FlipflopJK> jkList = model.findNode(FlipflopJK.class);
+
+        for (FlipflopJK jk : jkList) {
+            checkClock(jk);
+
+            // remove JK-ff from model
+            model.removeNode(jk);
+            jk.getClockVal().removeObserver(jk);
+            jk.getjVal().removeObserver(jk);
+            jk.getkVal().removeObserver(jk);
+
+            // create d ff
+            ObservableValue q = jk.getOutputs().get(0);
+            ObservableValue qn = jk.getOutputs().get(1);
+            FlipflopD d = new FlipflopD(jk.getLabel(), q, qn);
+
+            And a1 = new And(new ElementAttributes());
+            a1.setInputs(new ObservableValues(jk.getjVal(), qn));
+            And a2 = new And(new ElementAttributes());
+            Not nk = new Not(new ElementAttributes());
+            nk.setInputs(jk.getkVal().asList());
+            a2.setInputs(new ObservableValues(nk.getOutput(), q));
+
+            Or or = new Or(new ElementAttributes());
+            or.setInputs(new ObservableValues(a1.getOutput(), a2.getOutput()));
+
+            d.setInputs(new ObservableValues(or.getOutputs().get(0), jk.getClockVal()));
+
+            model.add(a1);
+            model.add(a2);
+            model.add(nk);
+            model.add(or);
+            model.add(d);
+        }
+    }
+
+    private void replaceTFF() throws NodeException, AnalyseException {
+        List<FlipflopT> jkList = model.findNode(FlipflopT.class);
+
+        for (FlipflopT tff : jkList) {
+            checkClock(tff);
+
+            // remove T-ff from model
+            model.removeNode(tff);
+            tff.getClockVal().removeObserver(tff);
+
+            // create d ff
+            ObservableValue q = tff.getOutputs().get(0);
+            ObservableValue qn = tff.getOutputs().get(1);
+            FlipflopD d = new FlipflopD(tff.getLabel(), q, qn);
+
+            d.setInputs(new ObservableValues(qn, getClock()));
+
+            model.add(d);
+        }
+    }
+
+
 }

src/main/java/de/neemann/digital/core/Model.java

@@ -461,4 +461,13 @@ public class Model implements Iterable<Node> {
     public Iterator<Node> iterator() {
         return nodes.iterator();
     }
+
+    /**
+     * removes a node from this model
+     *
+     * @param node the node to remove
+     */
+    public void removeNode(Node node) {
+        nodes.remove(node);
+    }
 }

src/main/java/de/neemann/digital/core/Observable.java

@@ -66,4 +66,13 @@ public class Observable {
     }
 
 
+    /**
+     * Returns true if the given observer observes this observable
+     *
+     * @param observer the observer
+     * @return true if the given observer observes this observable
+     */
+    public boolean hasObserver(Observer observer) {
+        return observers.contains(observer);
+    }
 }

src/main/java/de/neemann/digital/core/basic/Not.java

@@ -60,4 +60,10 @@ public class Not extends Node implements Element {
         return output.asList();
     }
 
+    /**
+     * @return the output
+     */
+    public ObservableValue getOutput() {
+        return output;
+    }
 }

src/main/java/de/neemann/digital/core/flipflops/FlipflopD.java

@@ -44,10 +44,29 @@ public class FlipflopD extends Node implements Element {
      * @param attributes the attributes
      */
     public FlipflopD(ElementAttributes attributes) {
+        this(attributes,
+                new ObservableValue("Q", attributes.getBits()),
+                new ObservableValue("\u00ACQ", attributes.getBits()));
+    }
+
+    /**
+     * Creates a new D-FF with the given outputs!
+     *
+     * @param label the label
+     * @param q     output
+     * @param qn    inverted output
+     */
+    public FlipflopD(String label, ObservableValue q, ObservableValue qn) {
+        this(new ElementAttributes().set(Keys.LABEL, label).setBits(q.getBits()), q, qn);
+        if (qn.getBits() != q.getBits())
+            throw new RuntimeException("wrong bit count given!");
+    }
+
+    private FlipflopD(ElementAttributes attributes, ObservableValue q, ObservableValue qn) {
         super(true);
         bits = attributes.getBits();
-        this.q = new ObservableValue("Q", bits);
-        this.qn = new ObservableValue("\u00ACQ", bits);
+        this.q = q;
+        this.qn = qn;
         isProbe = attributes.get(Keys.VALUE_IS_PROBE);
         label = attributes.getCleanLabel();
 
@@ -101,4 +120,11 @@ public class FlipflopD extends Node implements Element {
     public String getLabel() {
         return label;
     }
+
+    /**
+     * @return the clock value
+     */
+    public ObservableValue getClock() {
+        return clockVal;
+    }
 }

src/main/java/de/neemann/digital/core/flipflops/FlipflopJK.java

@@ -82,6 +82,34 @@ public class FlipflopJK extends Node implements Element {
         kVal = inputs.get(2).addObserverToValue(this).checkBits(1, this);
     }
 
+    /**
+     * @return the j value
+     */
+    public ObservableValue getjVal() {
+        return jVal;
+    }
+
+    /**
+     * @return the k value
+     */
+    public ObservableValue getkVal() {
+        return kVal;
+    }
+
+    /**
+     * @return the clock value
+     */
+    public ObservableValue getClockVal() {
+        return clockVal;
+    }
+
+    /**
+     * @return the label
+     */
+    public String getLabel() {
+        return label;
+    }
+
     @Override
     public ObservableValues getOutputs() {
         return ovs(q, qn);

src/main/java/de/neemann/digital/core/flipflops/FlipflopT.java

@@ -80,4 +80,17 @@ public class FlipflopT extends Node implements Element {
             model.addSignal(new Signal(label, q));
     }
 
+    /**
+     * @return the clock value
+     */
+    public ObservableValue getClockVal() {
+        return clockVal;
+    }
+
+    /**
+     * @return the label
+     */
+    public String getLabel() {
+        return label;
+    }
 }

src/main/resources/lang/lang_de.properties

@@ -202,6 +202,8 @@ err_pinMap_NoNameForPin_N=Kein Name f\u00FCr Pin {0}
 err_pinMap_input_N_notAllowed=Eingang {0} ist nicht erlaubt!
 err_pinMap_output_N_notAllowed=Ausgang {0} ist nicht erlaubt!
 err_cannotAnalyse_N=Element {0} kann nicht analysiert werden.
+err_ffNeedsToBeConnectedToClock=Flipflops m\u00FCssen direkt mit dem Takt verbunden sein.
+err_aSingleClockNecessary=Es darf nur einen Takt geben.
 
 attr_dialogTitle=Eigenschaften
 msg_errorEditingValue=Fehler bei der Eingabe eines Wertes

src/main/resources/lang/lang_en.properties

@@ -181,6 +181,8 @@ err_pinMap_NoNameForPin_N=No Name for pin {0}
 err_pinMap_input_N_notAllowed=Input {0} not allowed!
 err_pinMap_output_N_notAllowed=Output {0} not allowed!
 err_cannotAnalyse_N=Cannot analyse Node {0}
+err_ffNeedsToBeConnectedToClock=Flipflop needs to be connected to the clock.
+err_aSingleClockNecessary=A single clock is necessary.
 
 attr_dialogTitle=Attributes
 

src/test/java/de/neemann/digital/analyse/ModelAnalyserTest.java

@@ -28,4 +28,46 @@ public class ModelAnalyserTest extends TestCase {
                 "1\t0\t1\t\n" +
                 "1\t1\t0\t\n", tt.toString());
     }
+
+    public void testAnalyzerDFF() throws Exception {
+        Model model = new ToBreakRunner("dig/analyzeTestDFF.dig").getModel();
+        TruthTable tt = new ModelAnalyser(model).analyse();
+        check2BitCounter(tt);
+    }
+
+    public void testAnalyzerJKFF() throws Exception {
+        Model model = new ToBreakRunner("dig/analyzeTestJKFF.dig", false).getModel();
+        TruthTable tt = new ModelAnalyser(model).analyse();
+        check2BitCounter(tt);
+    }
+
+    public void testAnalyzerTFF() throws Exception {
+        Model model = new ToBreakRunner("dig/analyzeTestTFF.dig", false).getModel();
+        TruthTable tt = new ModelAnalyser(model).analyse();
+        check2BitCounter(tt);
+    }
+
+    private void check2BitCounter(TruthTable tt) {
+        assertEquals(4, tt.getRows());
+        assertEquals(4, tt.getCols());
+
+        // first col is XOr:
+        assertEquals(0, tt.getValue(0, 2));
+        assertEquals(1, tt.getValue(1, 2));
+        assertEquals(1, tt.getValue(2, 2));
+        assertEquals(0, tt.getValue(3, 2));
+
+        // second col
+        assertEquals(1, tt.getValue(0, 3));
+        assertEquals(0, tt.getValue(1, 3));
+        assertEquals(1, tt.getValue(2, 3));
+        assertEquals(0, tt.getValue(3, 3));
+
+        assertEquals("Q_1n\tQ_0n\tQ_1n+1\tQ_0n+1\t\n" +
+                "0\t0\t0\t1\t\n" +
+                "0\t1\t1\t0\t\n" +
+                "1\t0\t1\t1\t\n" +
+                "1\t1\t0\t0\t\n", tt.toString());
+    }
+
 }

src/test/java/de/neemann/digital/integration/ToBreakRunner.java

@@ -39,6 +39,19 @@ public class ToBreakRunner {
         this(new File(Resources.getRoot(), file));
     }
 
+    /**
+     * Creates a new instance
+     *
+     * @param file   the file to load
+     * @param doInit if true model is initialized
+     * @throws IOException
+     * @throws PinException
+     * @throws NodeException
+     */
+    public ToBreakRunner(String file, boolean doInit) throws IOException, PinException, NodeException {
+        this(new File(Resources.getRoot(), file), doInit);
+    }
+
     /**
      * Creates a new instance
      *
@@ -48,6 +61,10 @@ public class ToBreakRunner {
      * @throws NodeException
      */
     public ToBreakRunner(File filename) throws IOException, PinException, NodeException {
+        this(filename, true);
+    }
+
+    private ToBreakRunner(File filename, boolean doInit) throws IOException, PinException, NodeException {
         ElementLibrary library = new ElementLibrary();
         ShapeFactory shapeFactory = new ShapeFactory(library);
         circuit = Circuit.loadCircuit(filename, shapeFactory);
@@ -56,7 +73,8 @@ public class ToBreakRunner {
 
         ModelDescription md = new ModelDescription(circuit, library);
         model = md.createModel(false);
-        model.init(true);
+        if (doInit)
+            model.init(true);
     }
 
     /**