plugins/net.mograsim.machine/src/net/mograsim/machine/mi/components/CoreMicroInstructionMemory.java

   1 package net.mograsim.machine.mi.components;
   2
   3 import java.util.List;
   4
   5 import net.mograsim.logic.core.components.BasicCoreComponent;
   6 import net.mograsim.logic.core.timeline.Timeline;
   7 import net.mograsim.logic.core.timeline.TimelineEventHandler;
   8 import net.mograsim.logic.core.types.Bit;
   9 import net.mograsim.logic.core.types.BitVector;
  10 import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
  11 import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
  12 import net.mograsim.machine.mi.MicroInstructionMemory;
  13
  14 public class CoreMicroInstructionMemory extends BasicCoreComponent
  15 {
  16         private final ReadWriteEnd data;
  17         private final ReadEnd address;
  18         private final MicroInstructionMemory memory;
  19
  20         public CoreMicroInstructionMemory(Timeline timeline, int processTime, MicroInstructionMemory memory, ReadWriteEnd data, ReadEnd address)
  21         {
  22                 super(timeline, processTime);
  23                 this.memory = memory;
  24                 this.data = data;
  25                 this.address = address;
  26                 memory.registerObserver(a -> update());
  27                 address.registerObserver(this);
  28         }
  29
  30         public MicroInstructionMemory getMemory()
  31         {
  32                 return memory;
  33         }
  34
  35         @Override
  36         public List<ReadEnd> getAllInputs()
  37         {
  38                 return List.of(address);
  39         }
  40
  41         @Override
  42         public List<ReadWriteEnd> getAllOutputs()
  43         {
  44                 return List.of(data);
  45         }
  46
  47         @Override
  48         protected TimelineEventHandler compute()
  49         {
  50                 if (!address.getValues().isBinary())
  51                 {
  52                         return e -> data.feedSignals(Bit.U.toVector(data.width()));// TODO don't always feed U, but decide to feed X or U.
  53                 }
  54                 long addressed = address.getValues().getUnsignedValueLong();
  55                 BitVector storedData = memory.getCell(addressed).toBitVector();
  56                 return e -> data.feedSignals(storedData);
  57         }
  58 }