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