net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/GUIram5_12.java

   1 package net.mograsim.logic.model.am2900.components;
   2
   3 import static net.mograsim.logic.core.types.Bit.ONE;
   4 import static net.mograsim.logic.core.types.Bit.U;
   5 import static net.mograsim.logic.core.types.Bit.X;
   6 import static net.mograsim.logic.core.types.Bit.Z;
   7 import static net.mograsim.logic.core.types.Bit.ZERO;
   8
   9 import java.util.Arrays;
  10 import java.util.Map;
  11
  12 import net.mograsim.logic.core.types.Bit;
  13 import net.mograsim.logic.core.types.BitVector;
  14 import net.mograsim.logic.core.wires.Wire.ReadEnd;
  15 import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
  16 import net.mograsim.logic.model.model.ViewModelModifiable;
  17 import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedGUIComponent;
  18 import net.mograsim.logic.model.model.wires.Pin;
  19 import net.mograsim.logic.model.serializing.IndirectGUIComponentCreator;
  20 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  21
  22 public class GUIram5_12 extends SimpleRectangularHardcodedGUIComponent
  23 {
  24         public GUIram5_12(ViewModelModifiable model, String name)
  25         {
  26                 super(model, name, "RAM\n5 x 12 Bit");
  27                 setSize(40, 40);
  28                 addPin(new Pin(this, "A", 3, 10, 0), Usage.INPUT, Position.BOTTOM);
  29                 addPin(new Pin(this, "B", 3, 30, 0), Usage.INPUT, Position.BOTTOM);
  30                 addPin(new Pin(this, "WE", 1, 0, 5), Usage.INPUT, Position.RIGHT);
  31                 addPin(new Pin(this, "C", 1, 0, 15), Usage.INPUT, Position.RIGHT);
  32                 addPin(new Pin(this, "Y", 12, 0, 30), Usage.OUTPUT, Position.RIGHT);
  33                 addPin(new Pin(this, "D", 12, 20, 40), Usage.INPUT, Position.TOP);
  34         }
  35
  36         @Override
  37         protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  38         {
  39                 BitVector[] memC = (BitVector[]) lastState;
  40                 if (memC == null)
  41                 {
  42                         memC = new BitVector[6];
  43                         Arrays.fill(memC, 0, 5, BitVector.of(U, 12));
  44                         memC[5] = BitVector.of(U);
  45                 }
  46                 BitVector CVal = readEnds.get("C").getValues();
  47                 BitVector oldC = memC[5];
  48                 // TODO is the timing right?
  49                 if (oldC.getLSBit(0) == ZERO && CVal.getLSBit(0) == ONE && readEnds.get("WE").getValue() == ONE)
  50                 {
  51                         int BInt = getAsInt(readEnds.get("B").getValues());
  52                         if (BInt == -1 || BInt > 4)
  53                                 Arrays.fill(memC, BitVector.of(X, 12));
  54                         else if (BInt == -2)
  55                                 Arrays.fill(memC, BitVector.of(U, 12));
  56                         else
  57                                 memC[BInt] = readEnds.get("D").getValues();
  58                 }
  59                 int AInt = getAsInt(readEnds.get("A").getValues());
  60                 BitVector YVal = AInt == -1 || AInt > 4 ? BitVector.of(X, 12) : AInt == -2 ? BitVector.of(U, 12) : memC[AInt];
  61                 readWriteEnds.get("Y").feedSignals(YVal);
  62                 memC[5] = CVal;
  63                 return memC;
  64         }
  65
  66         /**
  67          * -1 means X, -2 means U
  68          */
  69         private static int getAsInt(BitVector vect)
  70         {
  71                 Bit[] bits = vect.getBits();
  72                 for (int i = 0; i < 3; i++)
  73                         if (bits[i] == X)
  74                                 return -1;
  75                 for (int i = 0; i < 3; i++)
  76                         if (bits[i] == U)
  77                                 return -2;
  78                 for (int i = 0; i < 3; i++)
  79                         if (bits[i] == Z)
  80                                 return -1;
  81                 // TODO maybe this is the wrong way around
  82                 return (bits[0] == ONE ? 4 : 0) + (bits[1] == ONE ? 2 : 0) + (bits[2] == ONE ? 1 : 0);
  83         }
  84
  85         static
  86         {
  87                 IndirectGUIComponentCreator.setComponentSupplier(GUIram5_12.class.getCanonicalName(), (m, p, n) -> new GUIram5_12(m, n));
  88         }
  89 }