-package mograsim.logic.core.components;
-
-import java.util.List;
-
-import mograsim.logic.core.timeline.Timeline;
-import mograsim.logic.core.wires.Wire;
-import mograsim.logic.core.wires.Wire.ReadEnd;
-import mograsim.logic.core.wires.Wire.ReadWriteEnd;
-
-/**
- * Models a multiplexer. Takes an arbitrary amount of input {@link Wire}s, one of which, as determined by select, is put through to the
- * output.
- *
- * @author Fabian Stemmler
- *
- */
-public class Demux extends BasicComponent
-{
- private final ReadEnd select, in;
- private final ReadWriteEnd[] outputs;
- private final int outputSize;
- private int selected = -1;
-
- /**
- * Output {@link Wire}s and in must be of uniform length
- *
- * @param in Must be of uniform length with all outputs.
- * @param select Indexes the output array to which the input is mapped. Must have enough bits to index all outputs.
- * @param outputs One of these outputs receives the input signal, depending on the select bits
- */
- public Demux(Timeline timeline, int processTime, ReadEnd in, ReadEnd select, ReadWriteEnd... outputs)
- {
- super(timeline, processTime);
- outputSize = in.length();
-
- this.in = in;
- this.outputs = outputs;
- for (int i = 0; i < this.outputs.length; i++)
- {
- if (outputs[i].length() != outputSize)
- throw new IllegalArgumentException("All DEMUX wire arrays must be of uniform length!");
- this.outputs[i] = outputs[i];
- }
-
- this.select = select;
- select.addObserver(this);
-
- int maxInputs = 1 << select.length();
- if (this.outputs.length > maxInputs)
- throw new IllegalArgumentException("There are more outputs (" + this.outputs.length + ") to the DEMUX than supported by "
- + select.length() + " select bits (" + maxInputs + ").");
- in.addObserver(this);
- }
-
- @Override
- public void compute()
- {
- int selectValue = select.hasNumericValue() ? (int) select.getUnsignedValue() : -1;
- if (selectValue >= outputs.length)
- selectValue = -1;
-
- if (selected != selectValue && selected != -1)
- outputs[selected].clearSignals();
-
- selected = selectValue;
-
- if (selectValue != -1)
- outputs[selectValue].feedSignals(in.getValues());
- }
-
- @Override
- public List<ReadEnd> getAllInputs()
- {
- return List.of(in, select);
- }
-
- @Override
- public List<ReadWriteEnd> getAllOutputs()
- {
- return List.of(outputs);
- }
-}