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Diffstat (limited to 'ext/systemc/src/sysc/communication/sc_signal_resolved.cpp')
| -rw-r--r-- | ext/systemc/src/sysc/communication/sc_signal_resolved.cpp | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/ext/systemc/src/sysc/communication/sc_signal_resolved.cpp b/ext/systemc/src/sysc/communication/sc_signal_resolved.cpp new file mode 100644 index 000000000..2b0aeca0b --- /dev/null +++ b/ext/systemc/src/sysc/communication/sc_signal_resolved.cpp @@ -0,0 +1,152 @@ +/***************************************************************************** + + 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. + + *****************************************************************************/ + +/***************************************************************************** + + sc_signal_resolved.cpp -- The resolved signal class. + + Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21 + + CHANGE LOG IS AT THE END OF THE FILE + *****************************************************************************/ + +#include "sysc/kernel/sc_simcontext.h" +#include "sysc/kernel/sc_process_handle.h" +#include "sysc/communication/sc_signal_resolved.h" + +namespace sc_core { + +// Note that we assume that two drivers driving the resolved signal to a 1 or +// 0 is O.K. This might not be true for all technologies, but is certainly +// true for CMOS, the predominant technology in use today. + +const sc_dt::sc_logic_value_t +sc_logic_resolution_tbl[4][4] = +{ // 0 1 Z X + { sc_dt::Log_0, sc_dt::Log_X, sc_dt::Log_0, sc_dt::Log_X }, // 0 + { sc_dt::Log_X, sc_dt::Log_1, sc_dt::Log_1, sc_dt::Log_X }, // 1 + { sc_dt::Log_0, sc_dt::Log_1, sc_dt::Log_Z, sc_dt::Log_X }, // Z + { sc_dt::Log_X, sc_dt::Log_X, sc_dt::Log_X, sc_dt::Log_X } // X +}; + + +// ---------------------------------------------------------------------------- +// FUNCTION : sc_logic_resolve +// +// Resolution function for sc_dt::sc_logic. +// ---------------------------------------------------------------------------- + +// resolves sc_dt::sc_logic values and returns the resolved value + +static void +sc_logic_resolve( sc_dt::sc_logic& result_, + const std::vector<sc_dt::sc_logic>& values_ ) +{ + int sz = values_.size(); + + assert( sz != 0 ); + + if( sz == 1 ) { + result_ = values_[0]; + return; + } + + sc_dt::sc_logic_value_t res = values_[0].value(); + for( int i = sz - 1; i > 0 && res != sc_dt::Log_X; -- i ) { + res = sc_logic_resolution_tbl[res][values_[i].value()]; + } + result_ = res; +} + + +// ---------------------------------------------------------------------------- +// CLASS : sc_signal_resolved +// +// The resolved signal class. +// ---------------------------------------------------------------------------- + +// write the new value + +void +sc_signal_resolved::write( const data_type& value_ ) +{ + sc_process_b* cur_proc = sc_get_current_process_b(); + + bool value_changed = false; + bool found = false; + + for( int i = m_proc_vec.size() - 1; i >= 0; -- i ) { + if( cur_proc == m_proc_vec[i] ) { + if( value_ != m_val_vec[i] ) { + m_val_vec[i] = value_; + value_changed = true; + } + found = true; + break; + } + } + + if( ! found ) { + m_proc_vec.push_back( cur_proc ); + m_val_vec.push_back( value_ ); + value_changed = true; + } + + if( value_changed ) { + request_update(); + } +} + + +void +sc_signal_resolved::update() +{ + sc_logic_resolve( m_new_val, m_val_vec ); + base_type::update(); +} + + +} // namespace sc_core + +// $Log: sc_signal_resolved.cpp,v $ +// Revision 1.5 2011/08/26 20:45:44 acg +// Andy Goodrich: moved the modification log to the end of the file to +// eliminate source line number skew when check-ins are done. +// +// Revision 1.4 2011/02/18 20:23:45 acg +// Andy Goodrich: Copyright update. +// +// Revision 1.3 2011/02/07 19:16:50 acg +// Andy Goodrich: changes for handling multiple writers. +// +// Revision 1.2 2011/01/20 16:52:15 acg +// Andy Goodrich: changes for IEEE 1666 2011. +// +// Revision 1.1.1.1 2006/12/15 20:20:04 acg +// SystemC 2.3 +// +// Revision 1.4 2006/03/21 00:00:27 acg +// Andy Goodrich: changed name of sc_get_current_process_base() to be +// sc_get_current_process_b() since its returning an sc_process_b instance. +// +// Revision 1.3 2006/01/13 18:47:42 acg +// Added $Log command so that CVS comments are reproduced in the source. +// + +// Taf! |