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Add a "forced halo" to diode clusters. 

When a long *horizontal* wire connect to a cluster, an antenna effect
may be created *before* the METAL3 is deposited, if the cluster's diode
is not *directly* connected to the gate through *only* METAL2. So, we
add a "forced halo" where the long horizontal connecting wires will be
broken by a diode *near* the gate. This problem do not occur for long
connecting METAL3, as the diode will be connected by then. Note that
we are hard-coding the gauge routing direction in the algorithm.
  With that modification, only one antenna effect remains in LibreSOC
LS180. May be corrected by post-treatement.

* New: In Anabatic::DiodeCluster::mergeForcedhalo() add specific secondary
    areas where diode must be insterted in addition to the one of the
    RroutingPad cluster. To "isolate" the cluster from long horizontal
    wires.
This commit is contained in:
Jean-Paul Chaput 2021-05-13 12:20:28 +02:00
parent 7ffe75110b
commit 8ce16add53
1 changed files with 78 additions and 46 deletions
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124
anabatic/src/AntennaProtect.cpp
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@ -127,7 +127,7 @@ namespace {
bool hasGCell ( GCell* ) const; bool hasGCell ( GCell* ) const;
inline Net* getTopNet () const; inline Net* getTopNet () const;
inline RoutingPad* getRefRp () const; inline RoutingPad* getRefRp () const;
inline GCellArea& _getArea (); inline vector<GCellArea>& _getAreas ();
inline AnabaticEngine* _getAnabatic () const; inline AnabaticEngine* _getAnabatic () const;
inline const RoutingPadInfos& getRoutingPads () const; inline const RoutingPadInfos& getRoutingPads () const;
inline RoutingPadInfos& _getRoutingPads () ; inline RoutingPadInfos& _getRoutingPads () ;
@ -141,18 +141,19 @@ namespace {
void merge ( GCell*, uint32_t distance, GCell* back=NULL ); void merge ( GCell*, uint32_t distance, GCell* back=NULL );
virtual void merge ( RoutingPad* ); virtual void merge ( RoutingPad* );
virtual void merge ( Segment* ) = 0; virtual void merge ( Segment* ) = 0;
void mergeForcedHalo ( size_t iarea, GCell*, uint32_t distance );
virtual void mergeHalo ( Segment*, uint32_t flags ); virtual void mergeHalo ( Segment*, uint32_t flags );
virtual void inflateArea (); virtual void inflateArea ();
Instance* _createDiode ( Etesian::Area*, const Box&, DbU::Unit uHint ); Instance* _createDiode ( Etesian::Area*, const Box&, DbU::Unit uHint );
Instance* _createDiode ( Etesian::Area*, GCell*, GCell* ); Instance* _createDiode ( Etesian::Area*, GCell*, GCell* );
virtual const vector<Instance*>& createDiode ( Etesian::Area* ); virtual const vector<Instance*>& createDiodes ( Etesian::Area* );
bool connectDiodes (); bool connectDiodes ();
private: private:
AnabaticEngine* _anabatic; AnabaticEngine* _anabatic;
DbU::Unit _WL; DbU::Unit _WL;
RoutingPadInfos _routingPads; RoutingPadInfos _routingPads;
GCellArea _area; vector<GCellArea> _areas;
vector<Instance*> _diodes; vector<Instance*> _diodes;
}; };
@ -179,7 +180,7 @@ namespace {
: _anabatic(anabatic) : _anabatic(anabatic)
, _WL(0) , _WL(0)
, _routingPads() , _routingPads()
, _area() , _areas(1)
, _diodes() , _diodes()
{ {
merge( rp ); merge( rp );
@ -190,15 +191,15 @@ namespace {
{ } { }
inline AnabaticEngine* DiodeCluster::_getAnabatic () const { return _anabatic; } inline AnabaticEngine* DiodeCluster::_getAnabatic () const { return _anabatic; }
inline GCellArea& DiodeCluster::_getArea () { return _area; } inline vector<GCellArea>& DiodeCluster::_getAreas () { return _areas; }
inline Net* DiodeCluster::getTopNet () const { return getRefRp()->getNet(); } inline Net* DiodeCluster::getTopNet () const { return getRefRp()->getNet(); }
inline DbU::Unit DiodeCluster::getWL () const { return _WL; } inline DbU::Unit DiodeCluster::getWL () const { return _WL; }
inline DbU::Unit& DiodeCluster::_getWL () { return _WL; } inline DbU::Unit& DiodeCluster::_getWL () { return _WL; }
inline const RoutingPadInfos& DiodeCluster::getRoutingPads () const { return _routingPads; } inline const RoutingPadInfos& DiodeCluster::getRoutingPads () const { return _routingPads; }
inline RoutingPadInfos& DiodeCluster::_getRoutingPads () { return _routingPads; } inline RoutingPadInfos& DiodeCluster::_getRoutingPads () { return _routingPads; }
inline const vector<Instance*>& DiodeCluster::getDiodes () const { return _diodes; } inline const vector<Instance*>& DiodeCluster::getDiodes () const { return _diodes; }
inline vector<Instance*>& DiodeCluster::_getDiodes () { return _diodes; } inline vector<Instance*>& DiodeCluster::_getDiodes () { return _diodes; }
DbU::Unit DiodeCluster::getAntennaMaxWL () const DbU::Unit DiodeCluster::getAntennaMaxWL () const
@ -216,7 +217,7 @@ namespace {
inline bool DiodeCluster::hasGCell ( GCell* gcell ) const inline bool DiodeCluster::hasGCell ( GCell* gcell ) const
{ {
if (not gcell) return false; if (not gcell) return false;
for ( auto& item : _area ) { for ( auto& item : _areas[0] ) {
if (elemGCell(item) == gcell) return true; if (elemGCell(item) == gcell) return true;
} }
return false; return false;
@ -232,11 +233,14 @@ namespace {
void DiodeCluster::showArea () const void DiodeCluster::showArea () const
{ {
cdebug_log(147,1) << "GCell diode area" << endl; cdebug_log(147,1) << "GCell diode areas:" << endl;
for ( auto& item : _area ) { for ( size_t i=0 ; i<_areas.size() ; ++i ) {
cdebug_log(147,0) << "| d=" << std::get<1>(item) cdebug_log(147,0) << "GCell diode area [" << i << "]" << endl;
<< " " << std::get<0>(item) for ( auto& item : _areas[i] ) {
<< " back=" << std::get<2>(item) << endl; cdebug_log(147,0) << " | d=" << std::get<1>(item)
<< " " << std::get<0>(item)
<< " back=" << std::get<2>(item) << endl;
}
} }
cdebug_tabw(147,-1); cdebug_tabw(147,-1);
} }
@ -269,14 +273,22 @@ namespace {
if (not gcell) return; if (not gcell) return;
if (hasGCell(gcell)) return; if (hasGCell(gcell)) return;
if (back) distance += 20; if (back) distance += 20;
_area.insert( make_tuple(gcell,distance,back) ); _areas[0].insert( make_tuple(gcell,distance,back) );
}
void DiodeCluster::mergeForcedHalo ( size_t iarea, GCell* gcell, uint32_t distance )
{
if (not gcell) return;
while ( iarea >= _areas.size() ) _areas.push_back( GCellArea() );
_areas[iarea].insert( make_tuple(gcell,distance,(GCell*)NULL) );
} }
Box DiodeCluster::getBoundingBox () const Box DiodeCluster::getBoundingBox () const
{ {
Box bb; Box bb;
for ( auto& item : _area ) bb.merge( elemGCell(item)->getBoundingBox() ); for ( auto& item : _areas[0] ) bb.merge( elemGCell(item)->getBoundingBox() );
return bb; return bb;
} }
@ -377,7 +389,7 @@ namespace {
} }
const vector<Instance*>& DiodeCluster::createDiode ( Etesian::Area* area ) const vector<Instance*>& DiodeCluster::createDiodes ( Etesian::Area* area )
{ {
if (not needsDiode()) return _diodes; if (not needsDiode()) return _diodes;
@ -387,19 +399,24 @@ namespace {
showArea(); showArea();
cdebug_log(147,1) << "DiodeCluster::createDiode() count=" << diodeCount << endl; cdebug_log(147,1) << "DiodeCluster::createDiode() count=" << diodeCount
<< ", forcedHalo=" << (_areas.size()-1) << endl;
Instance* diode = NULL; Instance* diode = NULL;
for ( auto& item : _area ) { for ( size_t i=0 ; i<_areas.size() ; ++i ) {
GCell* gcell = std::get<0>( item ); if (i) diodeCount = 1;
GCell* backGCell = std::get<2>( item ); cdebug_log(147,0) << "Diode for area [" << i << "]" << endl;
cdebug_log(147,0) << "| d=" << std::get<1>(item) << " " << gcell << endl; for ( auto& item : _areas[i] ) {
diode = _createDiode( area, gcell, backGCell ); GCell* gcell = std::get<0>( item );
if (diode) { GCell* backGCell = std::get<2>( item );
if (_diodes.size() < diodeCount) { cdebug_log(147,0) << "| d=" << std::get<1>(item) << " " << gcell << endl;
diode = NULL; diode = _createDiode( area, gcell, backGCell );
continue; if (diode) {
if (_diodes.size() < diodeCount) {
diode = NULL;
continue;
}
break;
} }
break;
} }
} }
cdebug_tabw(147,-1); cdebug_tabw(147,-1);
@ -496,6 +513,21 @@ namespace {
cdebug_log(147,0) << "DiodeRps::mergeHalo(): " << segment << endl; cdebug_log(147,0) << "DiodeRps::mergeHalo(): " << segment << endl;
if (not segment) return; if (not segment) return;
if ( (dynamic_cast<Horizontal*>(segment))
and (getWL() + segment->getLength() > getAntennaMaxWL())) {
cdebug_log(147,0) << " Put in forced halo." << segment << endl;
GCellsUnder gcells = _getAnabatic()->getGCellsUnder( segment );
if (not gcells->empty()) {
size_t iarea = _getAreas().size();
size_t count = std::min( gcells->size(), (size_t)10 );
for ( size_t i=0 ; i<count ; ++i ) {
size_t igcell = (flags & IsSegSource) ? i : (gcells->size()-1-i);
DiodeCluster::mergeForcedHalo( iarea, gcells->gcellAt(igcell), i );
}
}
return;
}
GCellsUnder gcells = _getAnabatic()->getGCellsUnder( segment ); GCellsUnder gcells = _getAnabatic()->getGCellsUnder( segment );
if (not gcells->empty()) { if (not gcells->empty()) {
size_t count = std::min( gcells->size(), (size_t)10 ); size_t count = std::min( gcells->size(), (size_t)10 );
@ -510,7 +542,7 @@ namespace {
void DiodeRps::inflateArea () void DiodeRps::inflateArea ()
{ {
vector< tuple<GCell*,GCell*> > border; vector< tuple<GCell*,GCell*> > border;
for ( auto& item : _getArea() ) { for ( auto& item : _getAreas()[0] ) {
GCell* current = std::get<0>( item ); GCell* current = std::get<0>( item );
if (std::get<2>(item)) continue; if (std::get<2>(item)) continue;
@ -522,7 +554,7 @@ namespace {
border.push_back( make_tuple(neighbor,current) ); border.push_back( make_tuple(neighbor,current) );
} }
for ( auto& item : _getArea() ) { for ( auto& item : _getAreas()[0] ) {
GCell* current = std::get<0>( item ); GCell* current = std::get<0>( item );
if (std::get<2>(item)) continue; if (std::get<2>(item)) continue;
@ -545,10 +577,10 @@ namespace {
class DiodeWire : public DiodeCluster { class DiodeWire : public DiodeCluster {
public: public:
DiodeWire ( AnabaticEngine*, RoutingPad* ); DiodeWire ( AnabaticEngine*, RoutingPad* );
virtual bool needsDiode () const; virtual bool needsDiode () const;
virtual void merge ( Segment* ); virtual void merge ( Segment* );
virtual const vector<Instance*>& createDiode ( Etesian::Area* ); virtual const vector<Instance*>& createDiodes ( Etesian::Area* );
private: private:
set<Box,CompareBySegmentBox> _boxes; set<Box,CompareBySegmentBox> _boxes;
set<Contact*,Go::CompareById> _contacts; set<Contact*,Go::CompareById> _contacts;
@ -576,7 +608,7 @@ namespace {
} }
const vector<Instance*>& DiodeWire::createDiode ( Etesian::Area* area ) const vector<Instance*>& DiodeWire::createDiodes ( Etesian::Area* area )
{ {
cdebug_log(147,1) << "DiodeWire::createDiode() " << endl; cdebug_log(147,1) << "DiodeWire::createDiode() " << endl;
DbU::Unit antennaMaxWL = getAntennaMaxWL(); DbU::Unit antennaMaxWL = getAntennaMaxWL();
@ -764,7 +796,7 @@ namespace Anabatic {
if (rpsDone.find(rp) != rpsDone.end()) continue; if (rpsDone.find(rp) != rpsDone.end()) continue;
cdebug_log(147,0) << "New cluster from " << rp << endl; cdebug_log(147,0) << "New cluster [" << clusters.size() << "] from " << rp << endl;
DiodeCluster* cluster = new DiodeRps ( this, rp ); DiodeCluster* cluster = new DiodeRps ( this, rp );
clusters.push_back( cluster ); clusters.push_back( cluster );
rpsDone.insert( rp ); rpsDone.insert( rp );
@ -943,7 +975,7 @@ namespace Anabatic {
continue; continue;
} }
const vector<Instance*>& diodes = clusters[i]->createDiode( etesian->getArea() ); const vector<Instance*>& diodes = clusters[i]->createDiodes( etesian->getArea() );
if (not diodes.empty()) { if (not diodes.empty()) {
clusters[i]->connectDiodes(); clusters[i]->connectDiodes();
} else { } else {