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
  21         public CoreMicroInstructionMemory(Timeline timeline, int processTime, MicroInstructionMemory memory, ReadWriteEnd data, ReadEnd address)
  22         {
  23                 super(timeline, processTime);
  24                 this.memory = memory;
  25                 this.data = data;
  26                 this.address = address;
  27         }
  28
  29         public MicroInstructionMemory getMemory()
  30         {
  31                 return memory;
  32         }
  33
  34         @Override
  35         public List<ReadEnd> getAllInputs()
  36         {
  37                 return List.of(address);
  38         }
  39
  40         @Override
  41         public List<ReadWriteEnd> getAllOutputs()
  42         {
  43                 return List.of(data);
  44         }
  45
  46         @Override
  47         protected TimelineEventHandler compute()
  48         {
  49                 if(!address.hasNumericValue())
  50                 {
  51                         return e -> data.feedSignals(Bit.U.toVector(data.width()));//TODO don't always feed U, but decide to feed X or U.
  52                 }
  53                 long addressed = address.getUnsignedValue();
  54                 BitVector storedData = memory.getCell(addressed).toBitVector();
  55                 return e -> data.feedSignals(storedData);
  56         }
  57 }