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

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