The final restructured version for automatic build using maven tycho

[Mograsim.git] / plugins / net.mograsim.logic.core / src / net / mograsim / logic / core / components / CoreMux.java

diff --git a/plugins/net.mograsim.logic.core/src/net/mograsim/logic/core/components/CoreMux.java b/plugins/net.mograsim.logic.core/src/net/mograsim/logic/core/components/CoreMux.java
new file mode 100644 (file)
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--- /dev/null
+++ b/plugins/net.mograsim.logic.core/src/net/mograsim/logic/core/components/CoreMux.java
@@ -0,0 +1,96 @@
+package net.mograsim.logic.core.components;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import net.mograsim.logic.core.timeline.Timeline;
+import net.mograsim.logic.core.timeline.TimelineEventHandler;
+import net.mograsim.logic.core.types.BitVector;
+import net.mograsim.logic.core.wires.CoreWire;
+import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
+import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
+
+/**
+ * Models a multiplexer. Takes an arbitrary amount of input {@link CoreWire}s, one of which, as determined by select, is put through to the
+ * output.
+ * 
+ * @author Fabian Stemmler
+ *
+ */
+public class CoreMux extends BasicCoreComponent
+{
+       private ReadEnd select;
+       private ReadWriteEnd out;
+       private ReadEnd[] inputs;
+       private final int outputSize;
+
+       /**
+        * Input {@link CoreWire}s and out must be of uniform width
+        * 
+        * @param out    Must be of uniform width with all inputs.
+        * @param select Indexes the input array which is to be mapped to the output. Must have enough bits to index all inputs.
+        * @param inputs One of these inputs is mapped to the output, depending on the select bits
+        */
+       public CoreMux(Timeline timeline, int processTime, ReadWriteEnd out, ReadEnd select, ReadEnd... inputs)
+       {
+               super(timeline, processTime);
+               outputSize = out.width();
+
+               this.inputs = inputs.clone();
+               for (int i = 0; i < this.inputs.length; i++)
+               {
+                       if (inputs[i].width() != outputSize)
+                               throw new IllegalArgumentException("All MUX wire arrays must be of uniform width!");
+                       inputs[i].registerObserver(this);
+               }
+
+               this.select = select;
+               select.registerObserver(this);
+
+               int maxInputs = 1 << select.width();
+               if (this.inputs.length > maxInputs)
+                       throw new IllegalArgumentException("There are more inputs (" + this.inputs.length + ") to the MUX than supported by "
+                                       + select.width() + " select bits (" + maxInputs + ").");
+
+               this.out = out;
+       }
+
+       public ReadEnd getOut()
+       {
+               return out;
+       }
+
+       public ReadEnd getSelect()
+       {
+               return select;
+       }
+
+       @Override
+       public TimelineEventHandler compute()
+       {
+               int selectValue;
+               if (!select.getValues().isBinary() || (selectValue = (int) select.getValues().getUnsignedValueLong()) >= inputs.length)
+               {
+                       return e -> out.clearSignals();
+               }
+
+               BitVector activeValues = inputs[selectValue].getValues();
+               return e -> out.feedSignals(activeValues);
+       }
+
+       @Override
+       public List<ReadEnd> getAllInputs()
+       {
+               ArrayList<ReadEnd> wires = new ArrayList<>(Arrays.asList(inputs));
+               wires.add(select);
+               return Collections.unmodifiableList(wires);
+       }
+
+       @Override
+       public List<ReadWriteEnd> getAllOutputs()
+       {
+               return List.of(out);
+       }
+}