86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/*
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* Copyright (c) 2000 Stephen Williams (steve@icarus.com)
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* Copyright (c) 2001 Stephan Boettcher <stephan@nevis.columbia.edu>
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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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# include "config.h"
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# include "compiler.h"
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# include "netlist.h"
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NetUDP::NetUDP(NetScope*s, perm_string n, unsigned pins, PUdp *u)
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: NetNode(s, n, pins), udp(u)
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{
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pin(0).set_dir(Link::OUTPUT);
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for (unsigned idx = 1 ; idx < pins ; idx += 1) {
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pin(idx).set_dir(Link::INPUT);
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}
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}
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bool NetUDP::first(string&inp, char&out) const
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{
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table_idx = (unsigned) -1;
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return next(inp, out);
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}
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bool NetUDP::next(string&inp, char&out) const
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{
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table_idx++;
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if (table_idx >= udp->tinput.count())
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return false;
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if (is_sequential())
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{
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inp = string("") + udp->tcurrent[table_idx] + udp->tinput[table_idx];
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assert(inp.length() == pin_count());
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}
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else
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{
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inp = udp->tinput[table_idx];
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assert(inp.length() == (pin_count()-1));
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}
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out = udp->toutput[table_idx];
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assert( (out == '0')
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|| (out == '1')
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|| (out == 'x')
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|| (is_sequential() && (out == '-')));
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return true;
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}
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char NetUDP::get_initial() const
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{
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assert (is_sequential());
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switch (udp->initial)
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{
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case verinum::V0:
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return '0';
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case verinum::V1:
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return '1';
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case verinum::Vx:
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case verinum::Vz:
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return 'x';
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}
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assert(0);
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return 'x';
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}
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