Moved main memory to machine module

[Mograsim.git] / net.mograsim.machine / src / net / mograsim / machine / standard / memory / WordAddressableMemoryComponent.java

diff --git a/net.mograsim.machine/src/net/mograsim/machine/standard/memory/WordAddressableMemoryComponent.java b/net.mograsim.machine/src/net/mograsim/machine/standard/memory/WordAddressableMemoryComponent.java
new file mode 100644 (file)
index 0000000..4a3edde
--- /dev/null
+++ b/net.mograsim.machine/src/net/mograsim/machine/standard/memory/WordAddressableMemoryComponent.java
@@ -0,0 +1,75 @@
+package net.mograsim.machine.standard.memory;
+
+import java.util.List;
+
+import net.mograsim.logic.core.components.BasicComponent;
+import net.mograsim.logic.core.timeline.Timeline;
+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;
+
+/**
+ * A memory component that only allows access to words of a specific length
+ */
+public class WordAddressableMemoryComponent extends BasicComponent
+{
+       private final WordAddressableMemory memory;
+       private final static Bit read = Bit.ONE;
+
+       private ReadWriteEnd data;
+       private ReadEnd rWBit, address;
+
+       /**
+        * @param data    The bits of this ReadEnd are the value that is written to/read from memory; The bit width of this wire is the width of
+        *                a memory word
+        * @param rWBit   The value of the 0th bit dictates the mode: 0: Write, 1: Read
+        * @param address The bits of this ReadEnd address the memory cell to read/write
+        */
+       public WordAddressableMemoryComponent(Timeline timeline, int processTime, long minimalAddress, long maximalAddress, ReadWriteEnd data,
+                       ReadEnd rWBit, ReadEnd address)
+       {
+               super(timeline, processTime);
+               this.data = data;
+               this.rWBit = rWBit;
+               this.address = address;
+               data.registerObserver(this);
+               rWBit.registerObserver(this);
+               address.registerObserver(this);
+
+               memory = new WordAddressableMemory(data.length(), minimalAddress, maximalAddress);
+       }
+
+       @Override
+       protected void compute()
+       {
+               if (!address.hasNumericValue())
+               {
+                       if (read.equals(rWBit.getValue()))
+                               data.feedSignals(BitVector.of(Bit.U, data.length()));
+                       else
+                               data.clearSignals();
+                       return;
+               }
+               long addressed = address.getUnsignedValue();
+               if (read.equals(rWBit.getValue()))
+                       data.feedSignals(memory.getCell(addressed));
+               else
+               {
+                       data.clearSignals();
+                       memory.setCell(addressed, data.getValues());
+               }
+       }
+
+       @Override
+       public List<ReadEnd> getAllInputs()
+       {
+               return List.of(data, rWBit, address);
+       }
+
+       @Override
+       public List<ReadWriteEnd> getAllOutputs()
+       {
+               return List.of(data);
+       }
+}
\ No newline at end of file