--- /dev/null
+package net.mograsim.logic.model.am2900.components;
+
+import static net.mograsim.logic.core.types.Bit.*;
+
+import java.util.Arrays;
+import java.util.Map;
+
+import net.mograsim.logic.core.types.Bit;
+import net.mograsim.logic.core.types.BitVector;
+import net.mograsim.logic.core.wires.Wire.ReadEnd;
+import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
+import net.mograsim.logic.model.model.ViewModelModifiable;
+import net.mograsim.logic.model.model.components.atomic.SimpleRectangularHardcodedGUIComponent;
+import net.mograsim.logic.model.model.wires.Pin;
+import net.mograsim.logic.model.snippets.symbolrenderers.PinNamesSymbolRenderer.PinNamesParams.Position;
+
+public class GUIram5_12 extends SimpleRectangularHardcodedGUIComponent
+{
+ public GUIram5_12(ViewModelModifiable model, String name)
+ {
+ super(model, name, "RAM\n5 x 12 Bit");
+ setSize(40, 40);
+ addPin(new Pin(this, "A", 3, 10, 0), Usage.INPUT, Position.BOTTOM);
+ addPin(new Pin(this, "B", 3, 30, 0), Usage.INPUT, Position.BOTTOM);
+ addPin(new Pin(this, "WE", 1, 0, 5), Usage.INPUT, Position.RIGHT);
+ addPin(new Pin(this, "C", 1, 0, 15), Usage.INPUT, Position.RIGHT);
+ addPin(new Pin(this, "Y", 12, 0, 30), Usage.OUTPUT, Position.RIGHT);
+ addPin(new Pin(this, "D", 12, 20, 40), Usage.INPUT, Position.TOP);
+ }
+
+ @Override
+ protected Object recalculate(Object lastState, Map<String, ReadEnd> readEnds, Map<String, ReadWriteEnd> readWriteEnds)
+ {
+ BitVector[] memC = (BitVector[]) lastState;
+ if (memC == null)
+ {
+ memC = new BitVector[6];
+ Arrays.fill(memC, 0, 5, BitVector.of(U, 12));
+ memC[5] = BitVector.of(U);
+ }
+ BitVector CVal = readEnds.get("C").getValues();
+ BitVector oldC = memC[5];
+ // TODO is the timing right?
+ if (oldC.getLSBit(0) == ZERO && CVal.getLSBit(0) == ONE && readEnds.get("WE").getValue() == ONE)
+ {
+ int BInt = getAsInt(readEnds.get("B").getValues());
+ if (BInt == -1 || BInt > 4)
+ Arrays.fill(memC, BitVector.of(X, 12));
+ else if (BInt == -2)
+ Arrays.fill(memC, BitVector.of(U, 12));
+ else
+ memC[BInt] = readEnds.get("D").getValues();
+ }
+ int AInt = getAsInt(readEnds.get("A").getValues());
+ BitVector YVal = AInt == -1 || AInt > 4 ? BitVector.of(X, 12) : AInt == -2 ? BitVector.of(U, 12) : memC[AInt];
+ readWriteEnds.get("Y").feedSignals(YVal);
+ memC[5] = CVal;
+ return memC;
+ }
+
+ /**
+ * -1 means X, -2 means U
+ */
+ private static int getAsInt(BitVector vect)
+ {
+ Bit[] bits = vect.getBits();
+ for (int i = 0; i < 3; i++)
+ if (bits[i] == X)
+ return -1;
+ for (int i = 0; i < 3; i++)
+ if (bits[i] == U)
+ return -2;
+ for (int i = 0; i < 3; i++)
+ if (bits[i] == Z)
+ return -1;
+ // TODO maybe this is the wrong way around
+ return (bits[0] == ONE ? 4 : 0) + (bits[1] == ONE ? 2 : 0) + (bits[2] == ONE ? 1 : 0);
+ }
+}
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