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Detect flip-flops connected to opads and turn 

them into OUTFF devices. Inprove support for
 the XNF-LCA attribute in the process.
This commit is contained in:
steve 1999-11-19 03:02:25 +00:00
parent fbf0bf1fb7
commit 8b81d6e416
4 changed files with 114 additions and 16 deletions
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18
netlist.cc
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: netlist.cc,v 1.87 1999/11/18 03:52:19 steve Exp $"
#ident "$Id: netlist.cc,v 1.88 1999/11/19 03:02:25 steve Exp $"
#endif
# include <cassert>
@ -77,6 +77,7 @@ ostream& operator<< (ostream&o, NetNet::Type t)
void connect(NetObj::Link&l, NetObj::Link&r)
{
assert(&l != &r);
NetObj::Link* cur = &l;
do {
NetObj::Link*tmp = cur->next_;
@ -242,6 +243,16 @@ const NetNet* find_link_signal(const NetObj*net, unsigned pin, unsigned&bidx)
return 0;
}
NetObj::Link* find_next_output(NetObj::Link*lnk)
{
for (NetObj::Link*cur = lnk->next_link()
; cur != lnk ; cur = cur->next_link())
if (cur->get_dir() == NetObj::Link::OUTPUT)
return cur;
return 0;
}
NetObj::NetObj(const string&n, unsigned np)
: name_(n), npins_(np), delay1_(0), delay2_(0), delay3_(0), mark_(false)
{
@ -2348,6 +2359,11 @@ NetNet* Design::find_signal(bool (*func)(const NetNet*))
/*
* $Log: netlist.cc,v $
* Revision 1.88 1999/11/19 03:02:25 steve
* Detect flip-flops connected to opads and turn
* them into OUTFF devices. Inprove support for
* the XNF-LCA attribute in the process.
*
* Revision 1.87 1999/11/18 03:52:19 steve
* Turn NetTmp objects into normal local NetNet objects,
* and add the nodangle functor to clean up the local

10
netlist.h
View File

@ -19,7 +19,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: netlist.h,v 1.89 1999/11/18 03:52:19 steve Exp $"
#ident "$Id: netlist.h,v 1.90 1999/11/19 03:02:25 steve Exp $"
#endif
/*
@ -1924,6 +1924,9 @@ extern unsigned count_inputs(const NetObj::Link&pin);
extern unsigned count_outputs(const NetObj::Link&pin);
extern unsigned count_signals(const NetObj::Link&pin);
/* Find the next link that is an output into the nexus. */
extern NetObj::Link* find_next_output(NetObj::Link*lnk);
/* Find the signal connected to the given node pin. There should
always be exactly one signal. The bidx parameter get filled with
the signal index of the Net, in case it is a vector. */
@ -1937,6 +1940,11 @@ extern ostream& operator << (ostream&, NetNet::Type);
/*
* $Log: netlist.h,v $
* Revision 1.90 1999/11/19 03:02:25 steve
* Detect flip-flops connected to opads and turn
* them into OUTFF devices. Inprove support for
* the XNF-LCA attribute in the process.
*
* Revision 1.89 1999/11/18 03:52:19 steve
* Turn NetTmp objects into normal local NetNet objects,
* and add the nodangle functor to clean up the local

28
t-xnf.cc
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: t-xnf.cc,v 1.17 1999/11/17 18:52:09 steve Exp $"
#ident "$Id: t-xnf.cc,v 1.18 1999/11/19 03:02:25 steve Exp $"
#endif
/* XNF BACKEND
@ -149,6 +149,12 @@ string target_xnf::choose_sig_name(const NetObj::Link*lnk)
if ((cursig->pin_count() == 1) && (sig->pin_count() > 1))
continue;
if ((cursig->pin_count() > 1) && (sig->pin_count() == 1)) {
sig = cursig;
pin = cur->get_pin();
continue;
}
if (cursig->local_flag() && !sig->local_flag())
continue;
@ -219,8 +225,11 @@ void target_xnf::draw_sym_with_lcaname(ostream&os, string lca,
os << "SYM, " << mangle(net->name()) << ", " << lcaname
<< ", LIBVER=2.0.0" << endl;
for (idx = 0 ; idx < net->pin_count() ; idx += 1)
draw_pin(os, scrape_pin_name(lca), net->pin(idx));
for (idx = 0 ; idx < net->pin_count() ; idx += 1) {
string usename = scrape_pin_name(lca);
if (usename == "") continue;
draw_pin(os, usename, net->pin(idx));
}
os << "END" << endl;
}
@ -481,7 +490,13 @@ void target_xnf::lpm_ff(ostream&os, const NetFF*net)
// XXXX For now, only support DFF
assert(type == "DFF");
// XXXX For now, I do not now how to deal with XNF-LCA attributes.
string lcaname = net->attribute("XNF-LCA");
if (lcaname != "") {
draw_sym_with_lcaname(os, lcaname, net);
return;
}
assert(net->attribute("XNF-LCA") == "");
for (unsigned idx = 0 ; idx < net->width() ; idx += 1) {
@ -638,6 +653,11 @@ extern const struct target tgt_xnf = { "xnf", &target_xnf_obj };
/*
* $Log: t-xnf.cc,v $
* Revision 1.18 1999/11/19 03:02:25 steve
* Detect flip-flops connected to opads and turn
* them into OUTFF devices. Inprove support for
* the XNF-LCA attribute in the process.
*
* Revision 1.17 1999/11/17 18:52:09 steve
* Add algorithm for choosing nexus name from attached signals.
*

74
xnfio.cc
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: xnfio.cc,v 1.6 1999/11/18 02:58:37 steve Exp $"
#ident "$Id: xnfio.cc,v 1.7 1999/11/19 03:02:25 steve Exp $"
#endif
# include "functor.h"
@ -49,7 +49,7 @@ static bool is_a_pad(const NetNet*net)
* really lame to not do the obvious optimization.
*/
static void make_obuf(Design*des, NetNet*net)
static NetLogic* make_obuf(Design*des, NetNet*net)
{
assert(net->pin_count() == 1);
@ -59,7 +59,7 @@ static void make_obuf(Design*des, NetNet*net)
if (count_outputs(net->pin(0)) <= 0) {
cerr << net->get_line() << ":warning: No outputs to OPAD: "
<< net->name() << endl;
return;
return 0;
}
assert(count_outputs(net->pin(0)) > 0);
@ -79,7 +79,7 @@ static void make_obuf(Design*des, NetNet*net)
&& (count_outputs(tmp->pin(0)) == 1)
&& (idx->get_pin() == 0) ) {
tmp->attribute("XNF-LCA", "OBUF:O,I");
return;
return tmp;
}
// Try to use an existing INV as an OBUF. Certain
@ -92,7 +92,7 @@ static void make_obuf(Design*des, NetNet*net)
&& (count_outputs(tmp->pin(0)) == 1)
&& (idx->get_pin() == 0) ) {
tmp->attribute("XNF-LCA", "OBUF:O,~I");
return;
return tmp;
}
// Try to use an existing bufif1 as an OBUFT. Of course
@ -104,7 +104,7 @@ static void make_obuf(Design*des, NetNet*net)
&& (count_outputs(tmp->pin(0)) == 1)
&& (idx->get_pin() == 0) ) {
tmp->attribute("XNF-LCA", "OBUFT:O,I,~T");
return;
return tmp;
}
if ((tmp->type() == NetLogic::BUFIF0)
@ -112,7 +112,7 @@ static void make_obuf(Design*des, NetNet*net)
&& (count_outputs(tmp->pin(0)) == 1)
&& (idx->get_pin() == 0) ) {
tmp->attribute("XNF-LCA", "OBUFT:O,I,T");
return;
return tmp;
}
}
@ -136,9 +136,53 @@ static void make_obuf(Design*des, NetNet*net)
// this case and create a new signal.
if (count_signals(buf->pin(1)) == 0) {
NetNet*tmp = new NetNet(des->local_symbol("$"), NetNet::WIRE);
tmp->local_flag(true);
connect(buf->pin(1), tmp->pin(0));
des->add_signal(tmp);
}
return buf;
}
static void absorb_OFF(Design*des, NetLogic*buf)
{
/* If the nexus connects is not a simple point-to-point link,
then I can't drag it into the IOB. Give up. */
if (count_outputs(buf->pin(1)) != 1)
return;
if (count_inputs(buf->pin(1)) != 1)
return;
NetObj::Link*drv = find_next_output(&buf->pin(1));
assert(drv);
NetFF*ff = dynamic_cast<NetFF*>(drv->get_obj());
if (ff == 0)
return;
if (ff->width() != 1)
return;
if (ff->attribute("LPM_FFType") != "DFF")
return;
/* Connect the flip-flop output to the buffer output and
delete the buffer. The XNF OUTFF can buffer the pin. */
connect(ff->pin_Q(0), buf->pin(0));
delete buf;
/* Finally, build up an XNF-LCA value that defines this
devices as an OUTFF and gives each pin an XNF name. */
char**names = new char*[ff->pin_count()];
for (unsigned idx = 0 ; idx < ff->pin_count() ; idx += 1)
names[idx] = "";
names[ff->pin_Clock().get_pin()] = "C";
names[ff->pin_Data(0).get_pin()] = "D";
names[ff->pin_Q(0).get_pin()] = "Q";
string lname = string("OUTFF:") + names[0];
for (unsigned idx = 1 ; idx < ff->pin_count() ; idx += 1)
lname = lname + "," + names[idx];
delete[]names;
ff->attribute("XNF-LCA", lname);
}
static void make_ibuf(Design*des, NetNet*net)
@ -192,6 +236,7 @@ static void make_ibuf(Design*des, NetNet*net)
void xnfio_f::signal(Design*des, NetNet*net)
{
NetNode*buf;
if (! is_a_pad(net))
return;
@ -204,9 +249,13 @@ void xnfio_f::signal(Design*des, NetNet*net)
make_ibuf(des, net);
break;
case 'o':
case 'O':
make_obuf(des, net);
break;
case 'O': {
NetLogic*buf = make_obuf(des, net);
if (buf == 0) break;
absorb_OFF(des, buf);
break;
}
// FIXME: Only IPAD and OPAD supported. Need to
// add support for IOPAD.
default:
@ -223,6 +272,11 @@ void xnfio(Design*des)
/*
* $Log: xnfio.cc,v $
* Revision 1.7 1999/11/19 03:02:25 steve
* Detect flip-flops connected to opads and turn
* them into OUTFF devices. Inprove support for
* the XNF-LCA attribute in the process.
*
* Revision 1.6 1999/11/18 02:58:37 steve
* Handle (with a warning) unconnected opads.
*