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synced 2025-09-17 08:55:05 -04:00
simplified the new masked ram
This commit is contained in:
hneemann
parent
0cea738d74
commit
b4f6c804b7
@ -167,15 +167,11 @@ public class RAMDualPort extends Node implements Element, RAMInterface {
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addr = (int) addrIn.getValue();
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if (str)
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writeDataToMemory(addr, data);
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memory.setData(addr, data);
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lastClk = clk;
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}
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void writeDataToMemory(int addr, long data) {
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memory.setData(addr, data);
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}
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@Override
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public void writeOutputs() throws NodeException {
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if (ld) {
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@ -5,19 +5,22 @@
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*/
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package de.neemann.digital.core.memory;
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import de.neemann.digital.core.Node;
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import de.neemann.digital.core.NodeException;
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import de.neemann.digital.core.ObservableValue;
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import de.neemann.digital.core.ObservableValues;
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import de.neemann.digital.core.element.Element;
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import de.neemann.digital.core.element.ElementAttributes;
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import de.neemann.digital.core.element.ElementTypeDescription;
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import de.neemann.digital.core.element.Keys;
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import de.neemann.digital.draw.elements.PinException;
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import static de.neemann.digital.core.element.PinInfo.input;
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/**
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* A memory which allows to overwrite single bytes.
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*/
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public class RAMDualPortMasked extends RAMDualPort {
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public class RAMDualPortMasked extends Node implements Element, RAMInterface {
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private static final long[] MASK_TABLE = new long[256];
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@ -41,17 +44,27 @@ public class RAMDualPortMasked extends RAMDualPort {
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input("A"),
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input("Din"),
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input("str"),
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input("C").setClock(),
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input("ld"),
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input("mask"))
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input("C").setClock())
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.addAttribute(Keys.ROTATE)
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.addAttribute(Keys.BITS)
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.addAttribute(Keys.ADDR_BITS)
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.addAttribute(Keys.IS_PROGRAM_MEMORY)
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.addAttribute(Keys.LABEL);
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private DataField memory;
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private final ObservableValue output;
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private final int addrBits;
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private final int bits;
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private final String label;
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private final int size;
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private final boolean isProgramMemory;
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private final int maskBits;
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private ObservableValue maskVal;
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private ObservableValue addrIn;
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private ObservableValue dataIn;
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private ObservableValue clkIn;
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private boolean lastClk = false;
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private long outputVal;
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/**
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* Creates a new instance
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@ -59,25 +72,95 @@ public class RAMDualPortMasked extends RAMDualPort {
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* @param attr the elements attributes
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*/
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public RAMDualPortMasked(ElementAttributes attr) {
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super(attr);
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super(true);
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bits = attr.get(Keys.BITS);
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output = new ObservableValue("D", bits).setPinDescription(DESCRIPTION);
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addrBits = attr.get(Keys.ADDR_BITS);
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size = 1 << addrBits;
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memory = new DataField(size);
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label = attr.getCleanLabel();
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isProgramMemory = attr.get(Keys.IS_PROGRAM_MEMORY);
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maskBits = Math.min(8, (getDataBits() - 1) / 8 + 1);
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}
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@Override
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public void setInputs(ObservableValues inputs) throws NodeException {
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super.setInputs(inputs);
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maskVal = inputs.get(5).checkBits(maskBits, this).addObserverToValue(this);
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addrIn = inputs.get(0).checkBits(addrBits, this);
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dataIn = inputs.get(1).checkBits(bits, this);
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maskVal = inputs.get(2).checkBits(maskBits, this);
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clkIn = inputs.get(3).checkBits(1, this).addObserverToValue(this);
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}
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@Override
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void writeDataToMemory(int addr, long data) {
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public void readInputs() throws NodeException {
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boolean clk = clkIn.getBool();
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if (!lastClk && clk) {
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int addr = (int) addrIn.getValue();
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outputVal = memory.getDataWord(addr);
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int maskVal = (int) this.maskVal.getValue();
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if (maskVal != 0) {
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long wData = dataIn.getValue();
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writeDataToMemory(addr, wData, maskVal);
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}
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}
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lastClk = clk;
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}
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private void writeDataToMemory(int addr, long data, int maskVal) {
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DataField memory = getMemory();
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long old = memory.getDataWord(addr);
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long mask = MASK_TABLE[(int) maskVal.getValue()];
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long mask = MASK_TABLE[maskVal];
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data = data & mask;
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old = old & ~mask;
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memory.setData(addr, data | old);
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}
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@Override
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public void writeOutputs() throws NodeException {
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output.setValue(outputVal);
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}
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@Override
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public ObservableValues getOutputs() throws PinException {
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return output.asList();
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}
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@Override
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public DataField getMemory() {
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return memory;
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}
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@Override
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public String getLabel() {
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return label;
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}
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@Override
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public int getSize() {
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return size;
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}
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@Override
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public int getAddrBits() {
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return addrBits;
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}
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@Override
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public boolean isProgramMemory() {
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return isProgramMemory;
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}
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@Override
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public void setProgramMemory(DataField dataField) {
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memory.setDataFrom(dataField);
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}
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@Override
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public int getDataBits() {
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return bits;
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}
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}
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@ -483,17 +483,16 @@
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<string name="elem_RAMDualPortMasked_tt">Ein RAM Modul mit getrennten Daten-Anschlüssen für Lesen und Schreiben.
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Es gibt einen Eingang für das Beschreiben und einen Ausgang für das Auslesen der gespeicherten Daten.
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Zusätzlich wird das Überschreigen einzelner Bytes ermöglicht. Auf diese Weise kann z.B. in einem 32
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Bit Speicher ein einzelnes Byte überschrieben werden.
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Bit Speicher ein einzelnes Byte überschrieben werden. Dieser RAM-Baustein aktualisiert seinen Ausgang
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nur bei einer steigenden Flanke an der Clock. Das erlaubt die Verwendung von Block-RAM in einem FPGA.
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</string>
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<string name="elem_RAMDualPortMasked_pin_A">Die Adresse, an der gelesen bzw. geschrieben wird.</string>
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<string name="elem_RAMDualPortMasked_pin_C">Der Takt. Eine steigende Flanke aktiviert das Speichern.</string>
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<string name="elem_RAMDualPortMasked_pin_C">Der Takt. A rising edge activates storing and reading.</string>
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<string name="elem_RAMDualPortMasked_pin_Din">Die Daten, die gespeichert werden sollen.</string>
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<string name="elem_RAMDualPortMasked_pin_D">Ausgabe der gespeicherten Daten.</string>
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<string name="elem_RAMDualPortMasked_pin_ld">Ist diese Leitung high, wird der Ausgang aktiviert, und die Daten liegen dort an.</string>
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<string name="elem_RAMDualPortMasked_pin_str">Ist diese Leitung high, wird das Datenwort gespeichert, wenn der Takt ansteigt.</string>
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<string name="elem_RAMDualPortMasked_pin_mask">Setzt die Schreibmaske. In dieser Maske steht jewels ein Bit für ein
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<string name="elem_RAMDualPortMasked_pin_str">Setzt die Schreibmaske. In dieser Maske steht jewels ein Bit für ein
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Byte im Speicher, welches überschrieben werden kann. Soll also das zweite Byte im Speicherwort überschrieben werden,
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muss auch das zweite Bit in der Maske gesetzt sein.
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muss auch das zweite Bit in der Maske gesetzt sein. Ist kein Bit gesetzt, wird nicht gespeichert.
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</string>
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<string name="elem_EEPROMDualPort">EEPROM, getrennte Ports</string>
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@ -486,19 +486,19 @@
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<string name="elem_RAMDualPortMasked">RAM, separated ports, byte access</string>
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<string name="elem_RAMDualPortMasked_short">RAM</string>
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<string name="elem_RAMDualPortMasked_tt">A RAM module with separate inputs for storing and output for reading the stored data.
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In addition, individual bytes can be overwritten. In this way, for example, a single byte can be overwritten in a 32-bit memory.
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<string name="elem_RAMDualPortMasked_tt">A RAM module with separate inputs for storing and output for reading the
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stored data. In addition, individual bytes can be overwritten. In this way, for example, a single byte can be
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overwritten in a 32-bit memory. This RAM only updates its output on a rising edge of the clock input.
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This allows the usage of Block RAM on an FPGA.
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</string>
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<string name="elem_RAMDualPortMasked_pin_A">The address to read from or write to.</string>
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<string name="elem_RAMDualPortMasked_pin_C">Clock input</string>
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<string name="elem_RAMDualPortMasked_pin_Din">The data to be stored in the RAM.</string>
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<string name="elem_RAMDualPortMasked_pin_D">The data output pin</string>
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<string name="elem_RAMDualPortMasked_pin_ld">If this input is high the output is activated and the data is visible at the output.</string>
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<string name="elem_RAMDualPortMasked_pin_str">If this input is high and when the clock becomes high, the the data is stored.</string>
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<string name="elem_RAMDualPortMasked_pin_mask">Sets the write mask. In this mask there is one bit for each byte in the memory,
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<string name="elem_RAMDualPortMasked_pin_str">Sets the write mask. In this mask there is one bit for each byte in the memory,
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which can be overwritten. If the second byte in the memory word is to be overwritten, the second bit in
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the mask must also be set.</string>
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the mask must also be set. If no bit is set, no data is stored.
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</string>
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<string name="elem_EEPROMDualPort">EEPROM, separated Ports</string>
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<string name="elem_EEPROMDualPort_short">EEPROM</string>
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<string name="elem_EEPROMDualPort_tt">A EEPROM module with separate inputs for storing and output for reading the stored data.</string>
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@ -29,7 +29,7 @@
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<int>32</int>
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</entry>
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</elementAttributes>
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<pos x="500" y="240"/>
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<pos x="500" y="220"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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@ -43,7 +43,7 @@
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<int>8</int>
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</entry>
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</elementAttributes>
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<pos x="260" y="180"/>
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<pos x="280" y="180"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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@ -59,16 +59,6 @@
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</elementAttributes>
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<pos x="380" y="200"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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<elementAttributes>
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<entry>
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<string>Label</string>
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<string>str</string>
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</entry>
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</elementAttributes>
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<pos x="260" y="220"/>
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</visualElement>
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<visualElement>
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<elementName>Clock</elementName>
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<elementAttributes>
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@ -79,16 +69,6 @@
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</elementAttributes>
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<pos x="380" y="260"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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<elementAttributes>
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<entry>
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<string>Label</string>
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<string>ld</string>
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</entry>
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</elementAttributes>
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<pos x="260" y="280"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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<elementAttributes>
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@ -101,7 +81,7 @@
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<int>4</int>
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</entry>
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</elementAttributes>
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<pos x="380" y="300"/>
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<pos x="280" y="240"/>
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</visualElement>
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<visualElement>
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<elementName>Testcase</elementName>
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@ -109,55 +89,55 @@
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<entry>
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<string>Testdata</string>
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<testData>
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<dataString>C A Din str ld mask D
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<dataString>C A Din mask D
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# no write at all, mask is zero
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C 0 0xffffffff 1 0 0b0000 x
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0 0 0 0 1 0b0000 0
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C 0 0xffffffff 0b0000 x
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0 0 0 0b0000 0
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# write bytes
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C 0 0xffffffff 1 0 0b0001 x
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0 0 0 0 1 0b0000 0xff
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C 0 0xffffffff 0b0001 x
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C 0 0 0b0000 0xff
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C 0 0xffffff00 1 0 0b0010 x
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0 0 0 0 1 0b0000 0xffff
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C 0 0xffffff00 0b0010 x
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C 0 0 0b0000 0xffff
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C 0 0xffff0000 1 0 0b0100 x
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0 0 0 0 1 0b0000 0xffffff
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C 0 0xffff0000 0b0100 x
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C 0 0 0b0000 0xffffff
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C 0 0xff000000 1 0 0b1000 x
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0 0 0 0 1 0b0000 0xffffffff
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C 0 0xff000000 0b1000 x
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C 0 0 0b0000 0xffffffff
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# write 16 bit words
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C 1 0xffff 1 0 0b0011 x
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0 1 0 0 1 0b0000 0xffff
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C 1 0xffff 0b0011 x
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C 1 0 0b0000 0xffff
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C 1 0xffff0000 1 0 0b1100 x
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0 1 0 0 1 0b0000 0xffffffff
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C 1 0xffff0000 0b1100 x
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C 1 0 0b0000 0xffffffff
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C 1 0xaaaa00 1 0 0b0110 x
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0 1 0 0 1 0b0000 0xffaaaaff
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C 1 0xaaaa00 0b0110 x
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C 1 0 0b0000 0xffaaaaff
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# write 32 bit words
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C 2 0xffffffff 1 0 0b1111 x
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0 2 0 0 1 0b0000 0xffffffff
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C 2 0xffffffff 0b1111 x
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C 2 0 0b0000 0xffffffff
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</dataString>
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</testData>
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</entry>
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</elementAttributes>
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<pos x="320" y="340"/>
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<pos x="320" y="320"/>
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</visualElement>
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</visualElements>
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<wires>
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<wire>
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<p1 x="460" y="240"/>
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<p2 x="500" y="240"/>
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<p1 x="280" y="240"/>
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<p2 x="400" y="240"/>
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</wire>
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<wire>
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<p1 x="260" y="180"/>
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<p1 x="280" y="180"/>
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<p2 x="400" y="180"/>
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</wire>
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<wire>
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@ -169,16 +149,8 @@ C 2 0xffffffff 1 0 0b1111 x
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<p2 x="400" y="200"/>
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</wire>
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<wire>
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<p1 x="260" y="280"/>
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<p2 x="400" y="280"/>
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</wire>
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<wire>
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<p1 x="260" y="220"/>
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<p2 x="400" y="220"/>
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</wire>
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<wire>
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<p1 x="380" y="300"/>
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<p2 x="400" y="300"/>
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<p1 x="460" y="220"/>
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<p2 x="500" y="220"/>
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</wire>
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</wires>
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</circuit>
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@ -29,7 +29,7 @@
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<int>64</int>
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</entry>
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</elementAttributes>
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<pos x="500" y="240"/>
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<pos x="500" y="220"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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@ -43,7 +43,7 @@
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<int>8</int>
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</entry>
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</elementAttributes>
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<pos x="260" y="180"/>
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<pos x="280" y="180"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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@ -59,16 +59,6 @@
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</elementAttributes>
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<pos x="380" y="200"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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<elementAttributes>
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<entry>
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<string>Label</string>
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<string>str</string>
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</entry>
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</elementAttributes>
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<pos x="260" y="220"/>
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</visualElement>
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<visualElement>
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<elementName>Clock</elementName>
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<elementAttributes>
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@ -79,16 +69,6 @@
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</elementAttributes>
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<pos x="380" y="260"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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<elementAttributes>
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<entry>
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<string>Label</string>
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<string>ld</string>
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</entry>
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</elementAttributes>
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<pos x="260" y="280"/>
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</visualElement>
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<visualElement>
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<elementName>In</elementName>
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<elementAttributes>
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@ -101,7 +81,7 @@
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<int>8</int>
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</entry>
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</elementAttributes>
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<pos x="380" y="300"/>
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<pos x="280" y="240"/>
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</visualElement>
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<visualElement>
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<elementName>Testcase</elementName>
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@ -109,59 +89,59 @@
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<entry>
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<string>Testdata</string>
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<testData>
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<dataString>C A Din str ld mask D
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<dataString>C A Din mask D
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# no write at all, mask is zero
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C 0 0xffffffffffffffff 1 0 0b00000000 x
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0 0 0 0 1 0b00000000 0
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C 0 0xffffffffffffffff 0b00000000 x
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C 0 0 0b00000000 0
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# write bytes
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C 0 0xffffffffffffffff 1 0 0b00000001 x
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0 0 0 0 1 0b00000000 0xff
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C 0 0xffffffffffffffff 0b00000001 x
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C 0 0 0b00000000 0xff
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C 0 0xffffffffffffff00 1 0 0b00000010 x
|
||||
0 0 0 0 1 0b00000000 0xffff
|
||||
C 0 0xffffffffffffff00 0b00000010 x
|
||||
C 0 0 0b00000000 0xffff
|
||||
|
||||
C 0 0xffffffffffff0000 1 0 0b00000100 x
|
||||
0 0 0 0 1 0b00000000 0xffffff
|
||||
C 0 0xffffffffffff0000 0b00000100 x
|
||||
C 0 0 0b00000000 0xffffff
|
||||
|
||||
C 0 0xffffffffff000000 1 0 0b00001000 x
|
||||
0 0 0 0 1 0b00000000 0xffffffff
|
||||
C 0 0xffffffffff000000 0b00001000 x
|
||||
C 0 0 0b00000000 0xffffffff
|
||||
|
||||
C 0 0xffffffff00000000 1 0 0b00010000 x
|
||||
0 0 0 0 1 0b00000000 0xffffffffff
|
||||
C 0 0xffffffff00000000 0b00010000 x
|
||||
C 0 0 0b00000000 0xffffffffff
|
||||
|
||||
C 0 0xffffff0000000000 1 0 0b00100000 x
|
||||
0 0 0 0 1 0b00000000 0xffffffffffff
|
||||
C 0 0xffffff0000000000 0b00100000 x
|
||||
C 0 0 0b00000000 0xffffffffffff
|
||||
|
||||
C 0 0xffff000000000000 1 0 0b01000000 x
|
||||
0 0 0 0 1 0b00000000 0xffffffffffffff
|
||||
C 0 0xffff000000000000 0b01000000 x
|
||||
C 0 0 0b00000000 0xffffffffffffff
|
||||
|
||||
C 0 0xff00000000000000 1 0 0b10000000 x
|
||||
0 0 0 0 1 0b00000000 0xffffffffffffffff
|
||||
C 0 0xff00000000000000 0b10000000 x
|
||||
C 0 0 0b00000000 0xffffffffffffffff
|
||||
|
||||
# write 32 bit words
|
||||
|
||||
C 1 0xffffffff 1 0 0b00001111 x
|
||||
0 1 0 0 1 0b00000000 0xffffffff
|
||||
C 1 0xffffffff 0b00001111 x
|
||||
C 1 0 0b00000000 0xffffffff
|
||||
|
||||
C 1 0xaaaaaaaa00000000 1 0 0b11110000 x
|
||||
0 1 0 0 1 0b00000000 0xaaaaaaaaffffffff
|
||||
C 1 0xaaaaaaaa00000000 0b11110000 x
|
||||
C 1 0 0b00000000 0xaaaaaaaaffffffff
|
||||
</dataString>
|
||||
</testData>
|
||||
</entry>
|
||||
</elementAttributes>
|
||||
<pos x="300" y="340"/>
|
||||
<pos x="320" y="320"/>
|
||||
</visualElement>
|
||||
</visualElements>
|
||||
<wires>
|
||||
<wire>
|
||||
<p1 x="460" y="240"/>
|
||||
<p2 x="500" y="240"/>
|
||||
<p1 x="280" y="240"/>
|
||||
<p2 x="400" y="240"/>
|
||||
</wire>
|
||||
<wire>
|
||||
<p1 x="260" y="180"/>
|
||||
<p1 x="280" y="180"/>
|
||||
<p2 x="400" y="180"/>
|
||||
</wire>
|
||||
<wire>
|
||||
@ -173,16 +153,8 @@ C 1 0xaaaaaaaa00000000 1 0 0b11110000 x
|
||||
<p2 x="400" y="200"/>
|
||||
</wire>
|
||||
<wire>
|
||||
<p1 x="260" y="280"/>
|
||||
<p2 x="400" y="280"/>
|
||||
</wire>
|
||||
<wire>
|
||||
<p1 x="260" y="220"/>
|
||||
<p2 x="400" y="220"/>
|
||||
</wire>
|
||||
<wire>
|
||||
<p1 x="380" y="300"/>
|
||||
<p2 x="400" y="300"/>
|
||||
<p1 x="460" y="220"/>
|
||||
<p2 x="500" y="220"/>
|
||||
</wire>
|
||||
</wires>
|
||||
</circuit>
|
||||
Loading…
x
Reference in New Issue
Block a user