X-Git-Url: https://mograsim.net/gitweb/?a=blobdiff_plain;f=era.mi%2Fsrc%2Fera%2Fmi%2Flogic%2Fcomponents%2FMux.java;fp=era.mi%2Fsrc%2Fera%2Fmi%2Flogic%2Fcomponents%2FMux.java;h=29c48146515c232fa761eddc4bbff41030ae7b65;hb=a4c5cfb856026771dfcf31eb22434b8b6ff20ad4;hp=0000000000000000000000000000000000000000;hpb=7199371e42ba04d2daab9f8512fdf25bd5f5ff92;p=Mograsim.git

diff --git a/era.mi/src/era/mi/logic/components/Mux.java b/era.mi/src/era/mi/logic/components/Mux.java
new file mode 100644
index 00000000..29c48146
--- /dev/null
+++ b/era.mi/src/era/mi/logic/components/Mux.java
@@ -0,0 +1,77 @@
+package era.mi.logic.components;
+
+import era.mi.logic.Bit;
+import era.mi.logic.WireArray;
+
+/**
+ * Models a Multiplexer. A is selected when select bit is 1, B when select bit is 0. Outputs X otherwise.
+ * @author Fabian
+ *
+ */
+public class Mux extends BasicComponent
+{
+	private WireArray a, b, out;
+	private WireArray select;
+	private final int size;
+	
+	/**
+	 * {@link WireArray}s a, b and out must be of uniform length, select
+	 * @param a Must be of uniform length with b and out.
+	 * @param b Must be of uniform length with a and out.
+	 * @param select C
+	 * @param out Must be of uniform length with a and b.
+	 */
+	public Mux(int processTime, WireArray a, WireArray b, WireArray select, WireArray out)
+	{
+		super(processTime);
+		size = a.length();
+		if(b.length() != out.length() || b.length() != size)
+			throw new IllegalArgumentException("All MUX wire arrays must be of uniform length!");
+		this.a = a;
+		a.addObserver(this);
+		this.b = b;
+		b.addObserver(this);
+		this.select = select;
+		select.addObserver(this);
+		this.out = out;
+	}
+
+	@Override
+	protected void compute()
+	{
+		WireArray active = b;
+		switch(select.getValue())
+		{
+		case ONE:
+			active = a;
+		case ZERO:
+			out.feedSignals(active.getValues());
+			break;
+		default:
+			Bit[] newValues = new Bit[size];
+			for(int i = 0; i < size; i++)
+				newValues[i] = Bit.X;
+			out.feedSignals(newValues);
+		}
+	}
+
+	public WireArray getA()
+	{
+		return a;
+	}
+
+	public WireArray getB()
+	{
+		return b;
+	}
+
+	public WireArray getOut()
+	{
+		return out;
+	}
+
+	public WireArray getSelect()
+	{
+		return select;
+	}
+}