era.mi/src/era/mi/logic/components/TriState.java

   1 package era.mi.logic.components;
   2
   3 import era.mi.logic.Bit;
   4 import era.mi.logic.wires.WireArray;
   5 import era.mi.logic.wires.WireArray.WireArrayInput;
   6
   7 public class TriState extends BasicComponent{
   8         WireArray in, enable;
   9         WireArrayInput outI;
  10
  11         public TriState(int processTime, WireArray in, WireArray out, WireArray enable) {
  12                 super(processTime);
  13                 if(in.length != out.length)
  14                         throw new IllegalArgumentException("Tri-state output must have the same amount of bits as the input. Input: " + in.length + " Output: " + out.length);
  15                 if(enable.length != 1)
  16                         throw new IllegalArgumentException("Tri-state enable must have exactly one bit, not " + enable.length + ".");
  17                 this.in = in;
  18                 in.addObserver(this);
  19                 this.enable = enable;
  20                 enable.addObserver(this);
  21                 outI = out.createInput();
  22         }
  23
  24         @Override
  25         protected void compute()
  26         {
  27                 if(enable.getValue() == Bit.ONE)
  28                         outI.feedSignals(in.getValues());
  29                 else
  30                         outI.clearSignals();
  31         }
  32
  33 }