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.model.wires.PinUsage;
  20 import net.mograsim.logic.model.serializing.IndirectGUIComponentCreator;
  21 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  22
  23 public class GUIram5_12 extends SimpleRectangularHardcodedGUIComponent
  24 {
  25         public GUIram5_12(ViewModelModifiable model, String name)
  26         {
  27                 super(model, name, "RAM\n5 x 12 Bit");
  28                 setSize(40, 40);
  29                 addPin(new Pin(this, "A", 3, PinUsage.INPUT, 10, 0), Position.BOTTOM);
  30                 addPin(new Pin(this, "B", 3, PinUsage.INPUT, 30, 0), Position.BOTTOM);
  31                 addPin(new Pin(this, "WE", 1, PinUsage.INPUT, 0, 5), Position.RIGHT);
  32                 addPin(new Pin(this, "C", 1, PinUsage.INPUT, 0, 15), Position.RIGHT);
  33                 addPin(new Pin(this, "Y", 12, PinUsage.OUTPUT, 0, 30), Position.RIGHT);
  34                 addPin(new Pin(this, "D", 12, PinUsage.INPUT, 20, 40), Position.TOP);
  35         }
  36
  37         @Override
  38         protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  39         {
  40                 BitVector[] memC = (BitVector[]) lastState;
  41                 if (memC == null)
  42                 {
  43                         memC = new BitVector[6];
  44                         Arrays.fill(memC, 0, 5, BitVector.of(U, 12));
  45                         memC[5] = BitVector.of(U);
  46                 }
  47                 BitVector CVal = readEnds.get("C").getValues();
  48                 BitVector oldC = memC[5];
  49                 // TODO is the timing right?
  50                 if (oldC.getLSBit(0) == ZERO && CVal.getLSBit(0) == ONE && readEnds.get("WE").getValue() == ONE)
  51                 {
  52                         int BInt = getAsInt(readEnds.get("B").getValues());
  53                         if (BInt == -1 || BInt > 4)
  54                                 Arrays.fill(memC, BitVector.of(X, 12));
  55                         else if (BInt == -2)
  56                                 Arrays.fill(memC, BitVector.of(U, 12));
  57                         else
  58                                 memC[BInt] = readEnds.get("D").getValues();
  59                 }
  60                 int AInt = getAsInt(readEnds.get("A").getValues());
  61                 BitVector YVal = AInt == -1 || AInt > 4 ? BitVector.of(X, 12) : AInt == -2 ? BitVector.of(U, 12) : memC[AInt];
  62                 readWriteEnds.get("Y").feedSignals(YVal);
  63                 memC[5] = CVal;
  64                 return memC;
  65         }
  66
  67         /**
  68          * -1 means X, -2 means U
  69          */
  70         private static int getAsInt(BitVector vect)
  71         {
  72                 Bit[] bits = vect.getBits();
  73                 for (int i = 0; i < 3; i++)
  74                         if (bits[i] == X)
  75                                 return -1;
  76                 for (int i = 0; i < 3; i++)
  77                         if (bits[i] == U)
  78                                 return -2;
  79                 for (int i = 0; i < 3; i++)
  80                         if (bits[i] == Z)
  81                                 return -1;
  82                 // TODO maybe this is the wrong way around
  83                 return (bits[0] == ONE ? 4 : 0) + (bits[1] == ONE ? 2 : 0) + (bits[2] == ONE ? 1 : 0);
  84         }
  85
  86         static
  87         {
  88                 IndirectGUIComponentCreator.setComponentSupplier(GUIram5_12.class.getCanonicalName(), (m, p, n) -> new GUIram5_12(m, n));
  89         }
  90 }