76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
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/*
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* Copyright (c) 2002 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CVS_IDENT
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#ident "$Id: sync.cc,v 1.1 2002/09/16 00:30:33 steve Exp $"
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#endif
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# include "config.h"
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# include "functor.h"
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# include "netlist.h"
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# include <assert.h>
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/*
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* Most process statements are not roots of synchronous logic.
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*/
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bool NetProc::is_synchronous()
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{
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return false;
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}
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bool NetEvWait::is_synchronous()
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{
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for (unsigned idx = 0 ; idx < nevents_ ; idx += 1) {
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NetEvent*ev = events_[idx];
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if (ev->nprobe() == 0)
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return false;
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for (unsigned pdx = 0 ; pdx < ev->nprobe() ; pdx += 1) {
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NetEvProbe*pr = ev->probe(pdx);
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/* No level sensitive clocks. */
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if (pr->edge() == NetEvProbe::ANYEDGE)
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return false;
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}
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}
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/* So we know that there is a clock source. Check that the
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input to the storage is asynchronous. */
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return true; //statement_->is_asynchronous();
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}
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bool NetProcTop::is_synchronous()
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{
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if (type_ == NetProcTop::KINITIAL)
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return false;
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return statement_->is_synchronous();
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}
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/*
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* $Log: sync.cc,v $
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* Revision 1.1 2002/09/16 00:30:33 steve
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* Add to synth2 support for synthesis of
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* synchronous logic. This includes DFF enables
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* modeled by if/then/else.
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*
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*/
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