net.mograsim.logic.model.am2900/src/net/mograsim/logic/model/am2900/components/Modelram5_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 import java.util.regex.Matcher;
  12 import java.util.regex.Pattern;
  13
  14 import net.mograsim.logic.core.types.Bit;
  15 import net.mograsim.logic.core.types.BitVector;
  16 import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
  17 import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
  18 import net.mograsim.logic.model.model.LogicModelModifiable;
  19 import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedModelComponent;
  20 import net.mograsim.logic.model.model.wires.Pin;
  21 import net.mograsim.logic.model.model.wires.PinUsage;
  22 import net.mograsim.logic.model.serializing.IndirectModelComponentCreator;
  23 import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
  24
  25 public class Modelram5_12 extends SimpleRectangularHardcodedModelComponent
  26 {
  27         public Modelram5_12(LogicModelModifiable model, String name)
  28         {
  29                 super(model, "ram5_12", name, "RAM\n5 x 12 Bit", false);
  30                 setSize(40, 40);
  31                 addPin(new Pin(model, this, "A", 3, PinUsage.INPUT, 10, 0), Position.BOTTOM);
  32                 addPin(new Pin(model, this, "B", 3, PinUsage.INPUT, 30, 0), Position.BOTTOM);
  33                 addPin(new Pin(model, this, "WE", 1, PinUsage.INPUT, 0, 5), Position.RIGHT);
  34                 addPin(new Pin(model, this, "C", 1, PinUsage.INPUT, 0, 15), Position.RIGHT);
  35                 addPin(new Pin(model, this, "Y", 12, PinUsage.OUTPUT, 0, 30), Position.RIGHT);
  36                 addPin(new Pin(model, this, "D", 12, PinUsage.INPUT, 20, 40), Position.TOP);
  37
  38                 init();
  39         }
  40
  41         @Override
  42         public Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
  43         {
  44                 BitVector[] memC = (BitVector[]) lastState;
  45                 if (memC == null)
  46                 {
  47                         memC = new BitVector[6];
  48                         Arrays.fill(memC, 0, 5, BitVector.of(U, 12));
  49                         memC[5] = BitVector.of(U);
  50                 }
  51                 BitVector CVal = readEnds.get("C").getValues();
  52                 BitVector oldC = memC[5];
  53                 // TODO is the timing right?
  54                 if (oldC.getLSBit(0) == ZERO && CVal.getLSBit(0) == ONE && readEnds.get("WE").getValue() == ONE)
  55                 {
  56                         int BInt = getAsInt(readEnds.get("B").getValues());
  57                         if (BInt == -1 || BInt > 4)
  58                                 Arrays.fill(memC, BitVector.of(X, 12));
  59                         else if (BInt == -2)
  60                                 Arrays.fill(memC, BitVector.of(U, 12));
  61                         else
  62                                 memC[BInt] = readEnds.get("D").getValues();
  63                 }
  64                 int AInt = getAsInt(readEnds.get("A").getValues());
  65                 BitVector YVal = AInt == -1 || AInt > 4 ? BitVector.of(X, 12) : AInt == -2 ? BitVector.of(U, 12) : memC[AInt];
  66                 readWriteEnds.get("Y").feedSignals(YVal);
  67                 memC[5] = CVal;
  68                 return memC;
  69         }
  70
  71         /**
  72          * -1 means X, -2 means U
  73          */
  74         private static int getAsInt(BitVector vect)
  75         {
  76                 Bit[] bits = vect.getBits();
  77                 for (int i = 0; i < 3; i++)
  78                         if (bits[i] == X)
  79                                 return -1;
  80                 for (int i = 0; i < 3; i++)
  81                         if (bits[i] == U)
  82                                 return -2;
  83                 for (int i = 0; i < 3; i++)
  84                         if (bits[i] == Z)
  85                                 return -1;
  86                 return (bits[0] == ONE ? 4 : 0) + (bits[1] == ONE ? 2 : 0) + (bits[2] == ONE ? 1 : 0);
  87         }
  88
  89         Pattern stateIDPattern = Pattern.compile("c(0[10][10]|100)");
  90
  91         @Override
  92         protected Object getHighLevelState(Object state, String stateID)
  93         {
  94                 Matcher m = stateIDPattern.matcher(stateID);
  95                 if (m.matches())
  96                         return ((BitVector[]) state)[Integer.parseInt(m.group(1), 2)];
  97                 return super.getHighLevelState(state, stateID);
  98         }
  99
 100         @Override
 101         protected Object setHighLevelState(Object lastState, String stateID, Object newHighLevelState)
 102         {
 103                 Matcher m = stateIDPattern.matcher(stateID);
 104                 if (m.matches())
 105                 {
 106                         int addr = Integer.parseInt(m.group(1), 2);
 107                         BitVector newHighLevelStateCasted = (BitVector) newHighLevelState;
 108                         if (newHighLevelStateCasted.length() != 12)
 109                                 throw new IllegalArgumentException("Expected BitVector of length 12, not " + newHighLevelStateCasted.length());
 110                         BitVector[] memC = (BitVector[]) lastState;
 111                         memC[addr] = newHighLevelStateCasted;
 112                         return memC;
 113                 }
 114                 return super.setHighLevelState(lastState, stateID, newHighLevelState);
 115         }
 116
 117         static
 118         {
 119                 IndirectModelComponentCreator.setComponentSupplier(Modelram5_12.class.getCanonicalName(), (m, p, n) -> new Modelram5_12(m, n));
 120         }
 121 }