1 package era.mi.logic.components;
3 import java.util.Arrays;
4 import java.util.Collections;
7 import era.mi.logic.wires.WireArray;
8 import era.mi.logic.wires.WireArray.WireArrayEnd;
11 * Models a multiplexer. Takes an arbitrary amount of input {@link WireArray}s, one of which, as determined by select, is put through to the
14 * @author Fabian Stemmler
17 public class Demux extends BasicComponent
19 private final WireArray select, in;
20 private final WireArray[] outputs;
21 private final WireArrayEnd[] outputsI;
22 private final int outputSize;
23 private int selected = -1;
26 * Input {@link WireArray}s and out must be of uniform length
28 * @param out Must be of uniform length with all inputs.
29 * @param select Indexes the input array which is to be mapped to the output. Must have enough bits to index all inputs.
30 * @param outputs One of these inputs is mapped to the output, depending on the select bits
32 public Demux(int processTime, WireArray in, WireArray select, WireArray... outputs)
35 outputSize = in.length;
38 this.outputs = outputs;
39 this.outputsI = new WireArrayEnd[outputs.length];
40 for (int i = 0; i < this.outputsI.length; i++)
42 if (outputs[i].length != outputSize)
43 throw new IllegalArgumentException("All DEMUX wire arrays must be of uniform length!");
44 this.outputsI[i] = outputs[i].createInput();
48 select.addObserver(this);
50 int maxInputs = 1 << select.length;
51 if (this.outputsI.length > maxInputs)
52 throw new IllegalArgumentException("There are more outputs (" + this.outputsI.length + ") to the DEMUX than supported by "
53 + select.length + " select bits (" + maxInputs + ").");
60 int selectValue = select.hasNumericValue() ? (int) select.getUnsignedValue() : -1;
61 if (selectValue >= outputsI.length)
64 if (selected != selectValue && selected != -1)
65 outputsI[selected].clearSignals();
67 selected = selectValue;
69 if (selectValue != -1)
70 outputsI[selectValue].feedSignals(in.getValues());
74 public List<WireArray> getAllInputs()
76 return Collections.unmodifiableList(Arrays.asList(in, select));
80 public List<WireArray> getAllOutputs()
82 return Collections.unmodifiableList(Arrays.asList(outputs));