1 package net.mograsim.machine.standard.memory;
5 import net.mograsim.logic.core.components.BasicCoreComponent;
6 import net.mograsim.logic.core.timeline.Timeline;
7 import net.mograsim.logic.core.types.Bit;
8 import net.mograsim.logic.core.wires.CoreWire.ReadEnd;
9 import net.mograsim.logic.core.wires.CoreWire.ReadWriteEnd;
10 import net.mograsim.machine.MainMemoryDefinition;
13 * A memory component that only allows access to words of a specific width
15 public class CoreWordAddressableMemory extends BasicCoreComponent
17 private final WordAddressableMemory memory;
18 private final static Bit read = Bit.ONE;
20 private ReadWriteEnd data;
21 private ReadEnd rWBit, address, clock;
24 * @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
26 * @param rWBit The value of the 0th bit dictates the mode: 0: Write, 1: Read
27 * @param address The bits of this ReadEnd address the memory cell to read/write
29 public CoreWordAddressableMemory(Timeline timeline, int processTime, MainMemoryDefinition definition, ReadWriteEnd data,
30 ReadEnd rWBit, ReadEnd address, ReadEnd clock)
32 super(timeline, processTime);
33 if(data.width() != definition.getCellWidth())
34 throw new IllegalArgumentException(String.format("Bit width of data wire does not match main memory definition. Expected: %d Actual: %d", definition.getCellWidth(), data.width()));
35 if(rWBit.width() != 1)
36 throw new IllegalArgumentException(String.format("Bit width of read/write mode select wire is unexpected. Expected: 1 Actual: %d", rWBit.width()));
37 if(address.width() != definition.getMemoryAddressBits())
38 throw new IllegalArgumentException(String.format("Bit width of address wire does not match main memory definition. Expected: %d Actual: %d", definition.getMemoryAddressBits(), address.width()));
41 this.address = address;
43 data.registerObserver(this);
44 rWBit.registerObserver(this);
45 address.registerObserver(this);
46 clock.registerObserver(this);
48 memory = new WordAddressableMemory(definition);
52 protected void compute()
54 if(clock.getValue() != Bit.ONE)
56 if (!address.hasNumericValue())
58 if (read.equals(rWBit.getValue()))
59 data.feedSignals(Bit.U.toVector(data.width()));
64 long addressed = address.getUnsignedValue();
65 if (read.equals(rWBit.getValue()))
66 data.feedSignals(memory.getCell(addressed));
70 memory.setCell(addressed, data.getValues());
75 public List<ReadEnd> getAllInputs()
77 return List.of(data, rWBit, address);
81 public List<ReadWriteEnd> getAllOutputs()