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+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+#ifndef __SYSTEMC_EXT_TLM_CORE_2_QUANTUM_GLOBAL_QUANTUM_HH__
+#define __SYSTEMC_EXT_TLM_CORE_2_QUANTUM_GLOBAL_QUANTUM_HH__
+
+#include <systemc>
+
+namespace tlm
+{
+
+//
+// tlm_global_quantum class
+//
+// The global quantum is the maximum time an initiator can run ahead of
+// SystemC time. All initiators should synchronize on timingpoints that
+// are multiples of the global quantum value.
+//
+// sc_set_time_resolution can only be called before the first
+// sc_time object is created. This means that after setting the
+// global quantum it will not be possible to call sc_set_time_resolution.
+// If sc_set_time_resolution must be called this must be done before
+// the global quantum is set.
+//
+
+class tlm_global_quantum
+{
+  public:
+    //
+    // Returns a reference to the tlm_global_quantum singleton
+    //
+    static tlm_global_quantum &instance();
+
+  public:
+
+    //
+    // Setter/getter for the global quantum
+    //
+    void set(const sc_core::sc_time &t) { m_global_quantum = t; }
+    const sc_core::sc_time &get() const { return m_global_quantum; }
+
+    //
+    // This function will calculate the maximum value for the next local
+    // quantum for an initiator. All initiators should synchronize on
+    // integer multiples of the global quantum value. The value for the
+    // local quantum of an initiator can be smaller, but should never be
+    // greater than the value returned by this method.
+    //
+    sc_core::sc_time compute_local_quantum();
+
+  protected:
+    tlm_global_quantum();
+
+  protected:
+    sc_core::sc_time m_global_quantum;
+};
+
+} // namespace tlm
+
+#endif /* __SYSTEMC_EXT_TLM_CORE_2_QUANTUM_GLOBAL_QUANTUM_HH__ */