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.WireArrayInput;
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 {
18 private final WireArray select, in;
19 private final WireArray[] outputs;
20 private final WireArrayInput[] outputsI;
21 private final int outputSize;
22 private int selected = -1;
25 * Input {@link WireArray}s and out must be of uniform length
27 * @param out Must be of uniform length with all inputs.
28 * @param select Indexes the input array which is to be mapped to the output. Must have enough bits to index all inputs.
29 * @param outputs One of these inputs is mapped to the output, depending on the select bits
31 public Demux(int processTime, WireArray in, WireArray select, WireArray... outputs) {
33 outputSize = in.length;
36 this.outputs = outputs;
37 this.outputsI = new WireArrayInput[outputs.length];
38 for (int i = 0; i < this.outputsI.length; i++) {
39 if (outputs[i].length != outputSize)
40 throw new IllegalArgumentException("All DEMUX wire arrays must be of uniform length!");
41 this.outputsI[i] = outputs[i].createInput();
45 select.addObserver(this);
47 int maxInputs = 1 << select.length;
48 if (this.outputsI.length > maxInputs)
49 throw new IllegalArgumentException("There are more outputs (" + this.outputsI.length + ") to the DEMUX than supported by "
50 + select.length + " select bits (" + maxInputs + ").");
55 public void compute() {
56 int selectValue = select.hasNumericValue() ? (int) select.getUnsignedValue() : -1;
57 if (selectValue >= outputsI.length)
60 if (selected != selectValue && selected != -1)
61 outputsI[selected].clearSignals();
63 selected = selectValue;
65 if (selectValue != -1)
66 outputsI[selectValue].feedSignals(in.getValues());
70 public List<WireArray> getAllInputs() {
71 return Collections.unmodifiableList(Arrays.asList(in, select));
75 public List<WireArray> getAllOutputs() {
76 return Collections.unmodifiableList(Arrays.asList(outputs));