diff --git a/libopenfpga/libarchopenfpga/arch/sample_arch.xml b/libopenfpga/libarchopenfpga/arch/sample_arch.xml
index d3b289b05..aaadd04ad 100644
--- a/libopenfpga/libarchopenfpga/arch/sample_arch.xml
+++ b/libopenfpga/libarchopenfpga/arch/sample_arch.xml
@@ -270,7 +270,7 @@
   </direct_connection>
   <pb_type_annotations>
     <!-- physical pb_type binding in complex block IO -->
-    <pb_type name="io" physical_mode_name="io_phy"/>
+    <pb_type name="io" physical_mode_name="io_phy" idle_mode_name="inpad"/>
     <pb_type name="io[io_phy].iopad" circuit_model_name="iopad" mode_bits="1"/> 
     <pb_type name="io[inpad].inpad" physical_pb_type_name="iopad" mode_bits="1"/> 
     <pb_type name="io[outpad].outpad" physical_pb_type_name="iopad" mode_bits="0"/> 
diff --git a/libopenfpga/libarchopenfpga/src/pb_type_annotation.cpp b/libopenfpga/libarchopenfpga/src/pb_type_annotation.cpp
index dda74520b..806a76c44 100644
--- a/libopenfpga/libarchopenfpga/src/pb_type_annotation.cpp
+++ b/libopenfpga/libarchopenfpga/src/pb_type_annotation.cpp
@@ -51,6 +51,14 @@ bool PbTypeAnnotation::is_physical_pb_type() const {
   return true == physical_pb_type_name_.empty();
 }
 
+std::string PbTypeAnnotation::physical_mode_name() const {
+  return physical_mode_name_;
+}
+
+std::string PbTypeAnnotation::idle_mode_name() const {
+  return idle_mode_name_;
+}
+
 std::string PbTypeAnnotation::mode_bits() const {
   return mode_bits_;
 }
@@ -121,6 +129,14 @@ void PbTypeAnnotation::set_physical_parent_mode_names(const std::vector<std::str
   physical_parent_mode_names_ = names;
 }
 
+void PbTypeAnnotation::set_physical_mode_name(const std::string& name) {
+  physical_mode_name_ = name;
+}
+
+void PbTypeAnnotation::set_idle_mode_name(const std::string& name) {
+  idle_mode_name_ = name;
+}
+
 void PbTypeAnnotation::set_mode_bits(const std::string& mode_bits) {
   mode_bits_ = mode_bits;
 }
diff --git a/libopenfpga/libarchopenfpga/src/pb_type_annotation.h b/libopenfpga/libarchopenfpga/src/pb_type_annotation.h
index e2ca62df6..8bf4480a8 100644
--- a/libopenfpga/libarchopenfpga/src/pb_type_annotation.h
+++ b/libopenfpga/libarchopenfpga/src/pb_type_annotation.h
@@ -41,6 +41,8 @@ class PbTypeAnnotation {
     std::vector<std::string> physical_parent_pb_type_names() const;
     std::vector<std::string> physical_parent_mode_names() const;
     bool is_physical_pb_type() const;
+    std::string physical_mode_name() const;
+    std::string idle_mode_name() const;
     std::string mode_bits() const;
     std::string circuit_model_name() const;
     int physical_pb_type_index_factor() const;
@@ -55,6 +57,8 @@ class PbTypeAnnotation {
     void set_physical_pb_type_name(const std::string& name);
     void set_physical_parent_pb_type_names(const std::vector<std::string>& names);
     void set_physical_parent_mode_names(const std::vector<std::string>& names);
+    void set_physical_mode_name(const std::string& name);
+    void set_idle_mode_name(const std::string& name);
     void set_mode_bits(const std::string& mode_bits);
     void set_circuit_model_name(const std::string& name);
     void physical_pb_type_index_factor(const int& value);
@@ -89,6 +93,12 @@ class PbTypeAnnotation {
     std::vector<std::string> physical_parent_pb_type_names_;
     std::vector<std::string> physical_parent_mode_names_;
 
+    /* Identify which mode is the physical implementation of an operating pb_type */
+    std::string physical_mode_name_;
+
+    /* Identify in which mode is the pb_type will operate when it is not used */
+    std::string idle_mode_name_;
+
     /* Configuration bits to select an operting mode for the circuit mode name */
     std::string mode_bits_;
 
diff --git a/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp b/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp
index 9bf10a171..7ac685436 100644
--- a/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp
+++ b/libopenfpga/libarchopenfpga/src/read_xml_pb_type_annotation.cpp
@@ -30,6 +30,7 @@ void read_xml_pb_type_annotation(pugi::xml_node& xml_pb_type,
   /* Find the name of pb_type */
   const std::string& name_attr = get_attribute(xml_pb_type, "name", loc_data).as_string();
   const std::string& physical_name_attr = get_attribute(xml_pb_type, "physical_pb_type_name", loc_data, pugiutil::ReqOpt::OPTIONAL).as_string();
+  const std::string& physical_mode_name_attr = get_attribute(xml_pb_type, "physical_mode_name", loc_data, pugiutil::ReqOpt::OPTIONAL).as_string();
 
   /* If both names are not empty, this is a operating pb_type */
   if ( (false == name_attr.empty()) 
@@ -45,6 +46,20 @@ void read_xml_pb_type_annotation(pugi::xml_node& xml_pb_type,
     pb_type_annotation.set_physical_pb_type_name(name_attr);
   }
 
+  /* Parse physical mode name which are applied to both pb_types */
+  pb_type_annotation.set_physical_mode_name(get_attribute(xml_pb_type, "physical_mode_name", loc_data, pugiutil::ReqOpt::OPTIONAL).as_string());
+
+  /* Parse idle mode name which are applied to both pb_types */
+  pb_type_annotation.set_idle_mode_name(get_attribute(xml_pb_type, "idle_mode_name", loc_data, pugiutil::ReqOpt::OPTIONAL).as_string());
+
+  /* Parse mode bits which are applied to both pb_types */
+  pb_type_annotation.set_mode_bits(get_attribute(xml_pb_type, "mode_bits", loc_data, pugiutil::ReqOpt::OPTIONAL).as_string());
+
+  /* If this is a physical pb_type, circuit model name is a mandatory attribute */
+  if (true == pb_type_annotation.is_physical_pb_type()) {
+    pb_type_annotation.set_circuit_model_name(get_attribute(xml_pb_type, "circuit_model_name", loc_data).as_string());
+  }
+
   /* Finish parsing and add it to the vector */ 
   pb_type_annotations.push_back(pb_type_annotation);
 }