plugins/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.timeline.TimelineEventHandler;
   7 import net.mograsim.logic.core.types.Bit;
   8 import net.mograsim.logic.core.types.BitVector;
   9 import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
  10 import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
  11
  12 public class CoreTriStateBuffer extends BasicCoreComponent
  13 {
  14         ReadEnd in, enable;
  15         ReadWriteEnd out;
  16
  17         public CoreTriStateBuffer(Timeline timeline, int processTime, ReadEnd in, ReadWriteEnd out, ReadEnd enable)
  18         {
  19                 super(timeline, processTime);
  20                 if (in.width() != out.width())
  21                         throw new IllegalArgumentException(
  22                                         "Tri-state output must have the same amount of bits as the input. Input: " + in.width() + " Output: " + out.width());
  23                 if (enable.width() != 1)
  24                         throw new IllegalArgumentException("Tri-state enable must have exactly one bit, not " + enable.width() + ".");
  25                 this.in = in;
  26                 in.registerObserver(this);
  27                 this.enable = enable;
  28                 enable.registerObserver(this);
  29                 this.out = out;
  30         }
  31
  32         @Override
  33         protected TimelineEventHandler compute()
  34         {
  35                 if (enable.getValue() == Bit.ONE)
  36                 {
  37                         BitVector inValues = in.getValues();
  38                         return e -> out.feedSignals(inValues);
  39                 }
  40                 return e -> out.clearSignals();
  41         }
  42
  43         @Override
  44         public List<ReadEnd> getAllInputs()
  45         {
  46                 return List.of(in, enable);
  47         }
  48
  49         @Override
  50         public List<ReadWriteEnd> getAllOutputs()
  51         {
  52                 return List.of(out);
  53         }
  54
  55 }