diff --git a/comdel/domain/attribute.h b/comdel/domain/attribute.h
index 8fc3256..f00b15a 100644
--- a/comdel/domain/attribute.h
+++ b/comdel/domain/attribute.h
@@ -1,6 +1,7 @@
 #ifndef DOMAIN_ATTRIBUTE_H
 #define DOMAIN_ATTRIBUTE_H
 
+#include <utility>
 #include <vector>
 
 #include "rule.h"
@@ -45,6 +46,11 @@ public:
     bool isEnumerated();
     std::vector<Enumeration> &getEnumeration();
 
+    void setEnumeration(std::vector<Enumeration> enums) {
+        enumerated = true;
+        enumeration = std::move(enums);
+    }
+
 };
 
 class Attribute
diff --git a/comdel/domain/bus.h b/comdel/domain/bus.h
index d422243..dbaab10 100644
--- a/comdel/domain/bus.h
+++ b/comdel/domain/bus.h
@@ -47,7 +47,7 @@ public:
     enum BusType {
         AUTOMATIC,
         REGULAR,
-        AUTOMATIC_SINGLE
+        SINGLE_AUTOMATIC
     };
 private:
     std::string name;
diff --git a/comdel/domain/pin.h b/comdel/domain/pin.h
index 2f86449..83bf785 100644
--- a/comdel/domain/pin.h
+++ b/comdel/domain/pin.h
@@ -14,8 +14,8 @@ class PinConnection
 {
 public:
     enum ConnectionType {
-        CHECK_ONLY,
-        AUTOMATICALLY
+        REQUIRED,
+        OPTIONAL
     };
 
 private:
diff --git a/comdel/domain/schemacreator.cpp b/comdel/domain/schemacreator.cpp
index 7bef32d..271501d 100644
--- a/comdel/domain/schemacreator.cpp
+++ b/comdel/domain/schemacreator.cpp
@@ -69,6 +69,8 @@ Value toType(ValueNode node) {
 Bus::BusType toType(BusNode::BusType type) {
     if(type == BusNode::AUTOMATIC) {
         return Bus::AUTOMATIC;
+    } else if(type == BusNode::SINGLE_AUTOMATIC) {
+        return Bus::SINGLE_AUTOMATIC;
     }
     return Bus::REGULAR;
 }
@@ -85,10 +87,10 @@ Pin::PinType toType(PinNode::PinType type) {
 
 PinConnection::ConnectionType toType(PinConnectionNode::ConnectionType type)
 {
-    if(type == PinConnectionNode::AUTOMATICALLY) {
-        return PinConnection::AUTOMATICALLY;
+    if(type == PinConnectionNode::OPTIONAL) {
+        return PinConnection::OPTIONAL;
     }
-    return PinConnection::CHECK_ONLY;
+    return PinConnection::REQUIRED;
 }
 
 
@@ -187,7 +189,7 @@ std::optional<Bus> SchemaCreator::loadBus(BusNode node)
         errors.emplace_back(node.span, "missing @display");
         return nullopt;
     }
-    if(node.display && (type == Bus::AUTOMATIC || type == Bus::AUTOMATIC_SINGLE)) {
+    if(node.display && (type == Bus::AUTOMATIC || type == Bus::SINGLE_AUTOMATIC)) {
         errors.emplace_back(node.span, "automatic bus cannot have a @display");
         return nullopt;
     }
@@ -212,6 +214,11 @@ std::optional<Bus> SchemaCreator::loadBus(BusNode node)
         }
     }
 
+    if(type == Bus::SINGLE_AUTOMATIC && wires.size() != 1) {
+        errors.emplace_back(node.span, "singleAutomatic bus must have exactly 1 wire defined");
+        return nullopt;
+    }
+
     return Bus(name, tooltip, type, count, wires, display);
 }
 
@@ -223,7 +230,7 @@ std::optional<AddressSpace> SchemaCreator::loadAddressSpace(AddressSpaceNode nod
 
 std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
 {
-    push(ComdelContext("connection", false, true, false));
+    push(ComdelContext("connection", false, true, false, false));
 
     std::string bus = node.bus.value;
     auto busInstance = getBus(bus);
@@ -231,6 +238,10 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
         errors.emplace_back(node.span, "bus does not exist");
     }
 
+    if(busInstance->getType() == Bus::SINGLE_AUTOMATIC) {
+        current().inSingleAutomaticConnection = true;
+    }
+
     if(busInstance->getType() == Bus::REGULAR) {
         ConnectionComponent first{node.first.component.value, node.first.pin.value};
 
@@ -285,7 +296,7 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
         pop();
 
         return Connection(first, nullopt, bus, attributes, wires, nullopt);
-    } else if(busInstance->getType() == Bus::AUTOMATIC || busInstance->getType() == Bus::AUTOMATIC_SINGLE) {
+    } else if(busInstance->getType() == Bus::AUTOMATIC || busInstance->getType() == Bus::SINGLE_AUTOMATIC) {
         ConnectionComponent first{node.first.component.value, node.first.pin.value};
 
         if(!node.second.has_value()) {
@@ -310,6 +321,10 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
             current().wires.push_back(wire.getName());
         }
 
+        if(node.attributes.size() != 2 && busInstance->getType() == Bus::SINGLE_AUTOMATIC) {
+            errors.emplace_back(node.span, "singleAutomatic must contain 2 attributes");
+        }
+
         std::vector<Attribute> attributes;
         for(auto & attribute : node.attributes) {
             auto attr = loadAttribute(attribute);
@@ -330,7 +345,9 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
                 firstWires.push_back(Value::fromNull());
             } else if(firstWire.is(ValueNode::INT)) {
                 firstWires.push_back(Value::fromInt(firstWire.asInt()));
-            } else if(firstWire.is(ValueNode::IDENTIFIER)) {
+            } else if(firstWire.is(ValueNode::STRING) && busInstance->getType() == Bus::SINGLE_AUTOMATIC) {
+                firstWires.push_back(Value::fromString(firstWire.asString()));
+            } else if(firstWire.is(ValueNode::IDENTIFIER) && busInstance->getType() == Bus::AUTOMATIC) {
                 if(attributeNames.count(firstWire.asIdentifier())) {
                     firstWires.push_back(Value::fromReference(firstWire.asIdentifier(), Value::ATTRIBUTE_REFERENCE));
                 } else if(wireNames.count(firstWire.asIdentifier())) {
@@ -339,7 +356,7 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
                     errors.emplace_back(firstWire.span, "unknown identifier");
                 }
             } else {
-                errors.emplace_back(firstWire.span, "unknown value type");
+                errors.emplace_back(firstWire.span, "unsupported value type");
             }
         }
 
@@ -350,7 +367,9 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
                 secondWires.push_back(Value::fromNull());
             } else if(secondWire.is(ValueNode::INT)) {
                 secondWires.push_back(Value::fromInt(secondWire.asInt()));
-            } else if(secondWire.is(ValueNode::IDENTIFIER)) {
+            } else if(secondWire.is(ValueNode::STRING) && busInstance->getType() == Bus::SINGLE_AUTOMATIC) {
+                secondWires.push_back(Value::fromString(secondWire.asString()));
+            } else if(secondWire.is(ValueNode::IDENTIFIER) && busInstance->getType() == Bus::AUTOMATIC) {
                 if(attributeNames.count(secondWire.asIdentifier())) {
                     secondWires.push_back(Value::fromReference(secondWire.asIdentifier(), Value::ATTRIBUTE_REFERENCE));
                 } else if(wireNames.count(secondWire.asIdentifier())) {
@@ -359,7 +378,25 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
                     errors.emplace_back(secondWire.span, "unknown identifier");
                 }
             } else {
-                errors.emplace_back(secondWire.span, "unknown value type");
+                errors.emplace_back(secondWire.span, "unsupported value type");
+            }
+        }
+
+        if(busInstance->getType() == Bus::SINGLE_AUTOMATIC && attributes.size() == 2) {
+            if(!attributes[0].getPopup().has_value()) {
+                errors.emplace_back(node.attributes[0].span, "@popup is required");
+            } else if(attributes[0].getDefault().getType() != Value::STRING) {
+                errors.emplace_back(node.attributes[0].span, "@attribute must be of type string");
+            } else {
+                attributes[0].getPopup()->setEnumeration(createWireEnumeration(firstWires));
+            }
+
+            if(!attributes[1].getPopup().has_value()) {
+                errors.emplace_back(node.attributes[1].span, "@popup is required");
+            } else if(attributes[1].getDefault().getType() != Value::STRING) {
+                errors.emplace_back(node.attributes[1].span, "@attribute must be of type string");
+            } else {
+                attributes[1].getPopup()->setEnumeration(createWireEnumeration(secondWires));
             }
         }
 
@@ -375,7 +412,7 @@ std::optional<Connection> SchemaCreator::loadConnection(ConnectionNode node)
 
 std::optional<Component> SchemaCreator::loadComponent(ComponentNode node)
 {
-    push(ComdelContext(node.name.value, true, false, false));
+    push(ComdelContext(node.name.value, true, false, false, false));
 
     std::string name = node.name.value;
 
@@ -581,7 +618,7 @@ std::optional<Attribute> SchemaCreator::loadAttribute(AttributeNode node)
             errors.emplace_back(node.name.span, "unsupported type");
         }
     }
-    if(current().inConnection) { // TODO remove identifier
+    if(current().inConnection && !current().inSingleAutomaticConnection) { // TODO remove identifier
         if (node.type == ValueNode::WIRE || node.type == ValueNode::IDENTIFIER) {
             if(current().doesWireExists(node.defaultValue->asIdentifier())) {
                 value = Value::fromReference(node.defaultValue->asIdentifier(), Value::WIRE_REFERENCE);
@@ -593,6 +630,13 @@ std::optional<Attribute> SchemaCreator::loadAttribute(AttributeNode node)
             errors.emplace_back(node.name.span, "unsupported type");
         }
     }
+    if(current().inSingleAutomaticConnection) {
+        if (node.type == ValueNode::STRING) {
+            value = Value::fromString(node.defaultValue->asString());
+        } else {
+            errors.emplace_back(node.name.span, "unsupported type");
+        }
+    }
 
     current().attributes.emplace_back(name, value);
 
@@ -864,4 +908,14 @@ std::shared_ptr<BusInstance> SchemaCreator::loadBusInstance(InstanceNode instanc
     return std::make_shared<BusInstance>(name, position, bus, static_cast<int>(size));
 }
 
+vector<Enumeration> SchemaCreator::createWireEnumeration(vector<Value> wireValues) {
+    vector<Enumeration> wires;
+    for(auto& wire: wireValues) {
+        if(wire.isType(Value::STRING)) {
+            wires.emplace_back(wire.asString(), wire);
+        }
+    }
+    return wires;
+}
+
 } // namespace domain
diff --git a/comdel/domain/schemacreator.h b/comdel/domain/schemacreator.h
index d0360b1..8ab600a 100644
--- a/comdel/domain/schemacreator.h
+++ b/comdel/domain/schemacreator.h
@@ -18,10 +18,11 @@ struct ComdelContext {
     std::string name;
     bool inComponent;
     bool inConnection;
+    bool inSingleAutomaticConnection;
     bool inBus;
 
-    ComdelContext(std::string name, bool inComponent, bool inConnection, bool inBus)
-        : name(name), inComponent(inComponent), inConnection(inConnection), inBus(inBus)
+    ComdelContext(std::string name, bool inComponent, bool inConnection, bool inSingleAutomaticConnection, bool inBus)
+        : name(name), inComponent(inComponent), inConnection(inConnection), inSingleAutomaticConnection(inSingleAutomaticConnection), inBus(inBus)
     {}
 
     bool doesAttributeExists(std::string name, Value::ValueType type) {
@@ -117,7 +118,7 @@ class SchemaCreator
             this->context.push_back(current());
             current().name = name;
         } else {
-            ComdelContext con(name, false, false, false);
+            ComdelContext con(name, false, false, false, false);
             push(con);
         }
     }
@@ -138,6 +139,8 @@ public:
     std::optional<Library> loadLibrary(LibraryNode node);
 
     Schema* loadSchema(SchemaNode node, Library &library);
+
+    vector <Enumeration> createWireEnumeration(vector <Value> vector1);
 };
 
 } // namespace domain
diff --git a/comdel/parser/astnode.h b/comdel/parser/astnode.h
index 62801c0..a1b41b7 100644
--- a/comdel/parser/astnode.h
+++ b/comdel/parser/astnode.h
@@ -181,8 +181,8 @@ struct DisplayNode: public AstNode
 struct PinConnectionNode: public AstNode
 {
     enum ConnectionType {
-        CHECK_ONLY,
-        AUTOMATICALLY
+        REQUIRED,
+        OPTIONAL
     };
 
     StringNode message;
@@ -273,7 +273,8 @@ struct BusNode: public AstNode
 {
     enum BusType {
         AUTOMATIC,
-        REGULAR
+        REGULAR,
+        SINGLE_AUTOMATIC
     };
 
     EnumNode<BusType> type;
diff --git a/comdel/parser/comdelparser.cpp b/comdel/parser/comdelparser.cpp
index 6465fad..3bb85e5 100644
--- a/comdel/parser/comdelparser.cpp
+++ b/comdel/parser/comdelparser.cpp
@@ -465,6 +465,7 @@ PResult<ComponentNode> ComdelParser::parseComponent()
             APPEND_OR_SET_ERR(component.rules, parseRule());
         } else {
             err = unexpected();
+            bump();
         }
         if(!err.has_value()) {
             errors.push_back(err.error());
@@ -583,6 +584,7 @@ PResult<BusNode> ComdelParser::parseBus() {
             RETURN_IF_NOT_TOKEN(TokenType::RBRACE);
         } else {
             err = unexpected();
+            bump();
         }
         if(!err.has_value()) {
             errors.push_back(err.error());
@@ -607,11 +609,13 @@ PResult<EnumNode<BusNode::BusType>> ComdelParser::parseBusType() {
             type = EnumNode(BusNode::AUTOMATIC);
         } else if(tokenType.value().value == "regular") {
             type = EnumNode(BusNode::REGULAR);
+        } else if(tokenType.value().value == "singleAutomatic") {
+            type = EnumNode(BusNode::SINGLE_AUTOMATIC);
         } else {
-            type = PError(SourceError{current().span, "expected 'automatic' or 'regular'"});
+            type = PError(SourceError{current().span, "expected 'automatic', 'singleAutomatic' or 'regular'"});
         }
     } else {
-        type = PError(SourceError{current().span, "expected 'automatic' or 'regular'"});
+        type = PError(SourceError{current().span, "expected 'automatic', 'singleAutomatic' or 'regular'"});
     }
     return type;
 }
@@ -728,6 +732,7 @@ PResult<PinNode> ComdelParser::parsePin() {
             pin.wires = *wires;
         } else {
             err = unexpected();
+            bump();
         }
         if(!err.has_value()) {
             errors.push_back(err.error());
@@ -771,15 +776,15 @@ PResult<EnumNode<PinConnectionNode::ConnectionType>> ComdelParser::parseConnecti
 
     if(check(TokenType::IDENTIFIER)) {
         auto identifier = parseIdentifier();
-        if(identifier.value().value == "check_only") {
-            type = EnumNode(PinConnectionNode::CHECK_ONLY);
-        } else if(identifier.value().value == "automatically") {
-            type = EnumNode(PinConnectionNode::AUTOMATICALLY);
+        if(identifier.value().value == "required") {
+            type = EnumNode(PinConnectionNode::REQUIRED);
+        } else if(identifier.value().value == "optional") {
+            type = EnumNode(PinConnectionNode::OPTIONAL);
         } else {
-            return PError(SourceError{current().span, "expected identifiers 'check_only' or 'automatically'"});
+            return PError(SourceError{current().span, "expected connection type 'required' or 'optional'"});
         }
     } else {
-        return PError(SourceError{current().span, "expected identifiers 'check_only' or 'automatically'"});
+        return PError(SourceError{current().span, "expected connection type 'required' or 'optional'"});
     }
 
     return spanner(type);
@@ -948,6 +953,7 @@ PResult<PopupNode> ComdelParser::parsePopup() {
             );
         } else {
             err = unexpected();
+            bump();
         }
         if(!err.has_value()) {
             errors.push_back(err.error());
@@ -965,7 +971,7 @@ PResult<PopupNode> ComdelParser::parsePopup() {
 
 /****************************************************************************
 *
-*    ConnectionNode :=  "@connection (" + COMPONENT + "." + PIN + "," + BUS) {" + CONNECTION + "}"
+*    ConnectionNode :=  "@connection (" + COMPONENT + "." + PIN + "," + BUS [ + "," + COMPONENT2 + "." + "PIN2"] + ") {" + CONNECTION + "}"
 *
 ****************************************************************************/
 PResult<ConnectionNode> ComdelParser::parseConnection() {
@@ -984,7 +990,6 @@ PResult<ConnectionNode> ComdelParser::parseConnection() {
     if(check(TokenType::COMMA)) {
         auto conn = ConnectionComponentNode{};
         RETURN_IF_NOT_TOKEN(TokenType::COMMA);
-        RETURN_IF_NOT_TOKEN(TokenType::LPAREN);
         ASSIGN_OR_RETURN_IF_ERR(conn.component, parseIdentifier());
         RETURN_IF_NOT_TOKEN(TokenType::DOT);
         ASSIGN_OR_RETURN_IF_ERR(conn.pin, parseIdentifier());
@@ -1016,6 +1021,7 @@ PResult<ConnectionNode> ComdelParser::parseConnection() {
             wireCount++;
         } else {
             err = unexpected();
+            bump();
         }
         if(!err.has_value()) {
             errors.push_back(err.error());
@@ -1251,6 +1257,7 @@ PResult<InstanceNode> ComdelParser::parseInstance() {
             instance.size = *number;
         } else {
             err = unexpected();
+            bump();
         }
         if(!err.has_value()) {
             errors.push_back(err.error());
@@ -1324,13 +1331,16 @@ PResult<ConnectionInstanceNode> ComdelParser::parseConnectionInstance() {
 }
 
 PResult<ValueNode> ComdelParser::parseConnectionWire() {
+    auto spanner = getSpanner();
     if(check(TokenType::NUMBER)) {
-        return ValueNode::ofInt(parseNumber()->value);
+        return spanner(ValueNode::ofInt(parseNumber()->value));
     } else if(check(TokenType::NIL)) {
         bump();
-        return ValueNode::ofNull();
+        return spanner(ValueNode::ofNull());
+    } else if(check(TokenType::STRING)) {
+        return spanner(ValueNode::ofString(parseString()->value));
     } else if(check(TokenType::IDENTIFIER)) {
-        return ValueNode::ofIdentifier(parseIdentifier()->value);
+        return spanner(ValueNode::ofIdentifier(parseIdentifier()->value));
     } else {
         return unexpected();
     }
diff --git a/examples/simplified FRISC model/frisc_library.csl b/examples/simplified FRISC model/frisc_library.csl
index f7205fc..523a163 100644
--- a/examples/simplified FRISC model/frisc_library.csl	
+++ b/examples/simplified FRISC model/frisc_library.csl	
@@ -17,7 +17,7 @@
 
 @component FRISC processor {
     @instanceName "procesor"
-    @tooltip "procesor FRISC, mora postojati jedan"
+    @tooltip "Procesor FRISC, mora postojati jedan"
     @count (1, 1)
     @source "FRISC.cdl"
     @display {
@@ -51,7 +51,7 @@
     }
     @pin glavniPin inOut {
         @tooltip "pin za spajanje na glavnu sabirnicu"
-        @connection check_only("COMDEL se ne može stvoriti. FRISC nije spojen na sabirnicu")
+        @connection required("COMDEL se ne može stvoriti. FRISC nije spojen na sabirnicu")
         @display {
             /*
             pin {
@@ -146,7 +146,7 @@
 
     @pin glavniPin inOut {
         @tooltip "pin za spajanje na glavnu sabirnicu"
-        @connection check_only("COMDEL se ne može stvoriti. Memorija nije spojena na sabirnicu")
+        @connection required("COMDEL se ne može stvoriti. Memorija nije spojena na sabirnicu")
         @display {
             /*
             pin {
@@ -214,7 +214,7 @@
 
     @pin glavniPin in {
         @tooltip "pin za spajanje na glavnu sabirnicu"
-        @connection check_only("COMDEL se ne može stvoriti. DMA nije spojena na sabirnicu")
+        @connection required("COMDEL se ne može stvoriti. DMA nije spojena na sabirnicu")
         @display {
             /*
             pin {
@@ -235,7 +235,7 @@
 
     @pin dodatnaPoveznica in {
         @tooltip "pin za spajanje na pomocnu sabirnicu"
-        @connection check_only("COMDEL se ne može stvoriti. DMA nije spojen na nesto!")
+        @connection optional("COMDEL se ne može stvoriti. DMA nije spojen na nesto!")
         @display {
             pin {
                 x: 0; y: 0; w: 0; h: 0;
@@ -285,6 +285,14 @@
         STROBE
     }
 }
+@bus Test singleAutomatic {
+    @tooltip "sabirnica za spajanje FRISC a s memorijama i UI/jedinicama"
+    @count (1,1)
+
+    @wires {
+        CONNECTOR,
+    }
+}
 
 @connection (FRISC.glavniPin, glavnaSabirnica) {
     @wires{ADR, DATA, READ, WRITE, SIZE, WAIT, INT0, INT1, INT2, INT3, IACK, 1, null}
@@ -307,4 +315,28 @@
         }
     }
     @wires{ADR, DATA, READ, WRITE, SIZE, WAIT, interupt, BREQ, BACK}
+}
+
+@connection (DMA.glavniPin, PIOSabirnica, FRISC.glavniPin) {
+    @wires{PIO_DATA, READY, STROBE}
+    @wires{PIO_DATA, READY, STROBE}
+}
+
+@connection (FRISC.glavniPin, Test, Memorija.glavniPin) {
+    @wires{null, "READY", null}
+    @wires{"PIO_DATA", null, null}
+
+    @attribute dmaPoveznica string default "" {
+        @popup automatic {
+            @title "Spoji DMA kraj"
+            @text "Odaberite poveznicu za dma kraja"
+        }
+    }
+
+    @attribute mmaPoveznica string default "" {
+        @popup automatic {
+            @title "Spoji MMA kraj"
+            @text "Odaberite poveznicu za mma kraja"
+        }
+    }
 }
\ No newline at end of file
diff --git a/examples/simplified FRISC model/schema.csl b/examples/simplified FRISC model/schema.csl
index 79714ea..b57dd57 100644
--- a/examples/simplified FRISC model/schema.csl	
+++ b/examples/simplified FRISC model/schema.csl	
@@ -17,7 +17,14 @@
         @size 100
     }
 
+    @instance testBus Test {}
+
     @connection (proc.glavniPin, bus) {}
 
     @connection (mem.glavniPin, bus) {}
+
+    @connection (proc.glavniPin, testBus, mem.glavniPin) {
+        @attribute dmaPoveznica "READY"
+        @attribute mmaPoveznica "PIO_DATA"
+    }
 }
\ No newline at end of file