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