net.mograsim.logic.core/src/net/mograsim/logic/core/components/CoreTriStateBuffer.java

   1 package net.mograsim.logic.core.components;
   2
   3 import java.util.List;
   4
   5 import net.mograsim.logic.core.timeline.Timeline;
   6 import net.mograsim.logic.core.types.Bit;
   7 import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
   8 import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
   9
  10 public class CoreTriStateBuffer extends BasicCoreComponent
  11 {
  12         ReadEnd in, enable;
  13         ReadWriteEnd out;
  14
  15         public CoreTriStateBuffer(Timeline timeline, int processTime, ReadEnd in, ReadWriteEnd out, ReadEnd enable)
  16         {
  17                 super(timeline, processTime);
  18                 if (in.width() != out.width())
  19                         throw new IllegalArgumentException(
  20                                         "Tri-state output must have the same amount of bits as the input. Input: " + in.width() + " Output: " + out.width());
  21                 if (enable.width() != 1)
  22                         throw new IllegalArgumentException("Tri-state enable must have exactly one bit, not " + enable.width() + ".");
  23                 this.in = in;
  24                 in.registerObserver(this);
  25                 this.enable = enable;
  26                 enable.registerObserver(this);
  27                 this.out = out;
  28         }
  29
  30         @Override
  31         protected void compute()
  32         {
  33                 if (enable.getValue() == Bit.ONE)
  34                         out.feedSignals(in.getValues());
  35                 else
  36                         out.clearSignals();
  37         }
  38
  39         @Override
  40         public List<ReadEnd> getAllInputs()
  41         {
  42                 return List.of(in, enable);
  43         }
  44
  45         @Override
  46         public List<ReadWriteEnd> getAllOutputs()
  47         {
  48                 return List.of(out);
  49         }
  50
  51 }