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/*
* Copyright (c) 2000 Stephen Williams (steve@icarus.com)
* Copyright (c) 2001 Stephan Boettcher <stephan@nevis.columbia.edu>
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
# include "config.h"
# include "compiler.h"
# include "netlist.h"
NetUDP::NetUDP(NetScope*s, perm_string n, unsigned pins, PUdp *u)
: NetNode(s, n, pins), udp(u)
{
pin(0).set_dir(Link::OUTPUT);
for (unsigned idx = 1 ; idx < pins ; idx += 1) {
pin(idx).set_dir(Link::INPUT);
}
}
bool NetUDP::first(string&inp, char&out) const
{
table_idx = (unsigned) -1;
return next(inp, out);
}
bool NetUDP::next(string&inp, char&out) const
{
table_idx++;
if (table_idx >= udp->tinput.count())
return false;
if (is_sequential())
{
inp = string("") + udp->tcurrent[table_idx] + udp->tinput[table_idx];
assert(inp.length() == pin_count());
}
else
{
inp = udp->tinput[table_idx];
assert(inp.length() == (pin_count()-1));
}
out = udp->toutput[table_idx];
assert( (out == '0')
|| (out == '1')
|| (out == 'x')
|| (is_sequential() && (out == '-')));
return true;
}
char NetUDP::get_initial() const
{
assert (is_sequential());
switch (udp->initial)
{
case verinum::V0:
return '0';
case verinum::V1:
return '1';
case verinum::Vx:
case verinum::Vz:
return 'x';
}
assert(0);
return 'x';
}
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