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report parasitic annotation resistor loops 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2023-01-01 08:03:53 -07:00
parent 85507b7a6e
commit 904cecf988
2 changed files with 18 additions and 7 deletions
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21
parasitics/ConcreteParasitics.cc
View File

@ -1652,7 +1652,9 @@ ConcreteParasitics::checkAnnotation1(const Pin *drvr_pin,
delete pin_iter;
ParasiticNodeSet visited_nodes;
checkAnnotation2(drvr_pin, drvr_node, nullptr, loads, visited_nodes);
ParasiticDeviceSet loop_resistors;
checkAnnotation2(drvr_pin, drvr_node, nullptr, loads,
visited_nodes, loop_resistors);
return loads;
}
@ -1661,7 +1663,8 @@ ConcreteParasitics::checkAnnotation2(const Pin *drvr_pin,
ParasiticNode *node,
ParasiticDevice *from_res,
PinSet &loads,
ParasiticNodeSet &visited_nodes)
ParasiticNodeSet &visited_nodes,
ParasiticDeviceSet &loop_resistors)
{
const Pin *pin = parasitics_->connectionPin(node);
if (pin)
@ -1671,13 +1674,19 @@ ConcreteParasitics::checkAnnotation2(const Pin *drvr_pin,
ParasiticDeviceIterator *device_iter = parasitics_->deviceIterator(node);
while (device_iter->hasNext()) {
ParasiticDevice *device = device_iter->next();
if (parasitics_->isResistor(device)) {
if (parasitics_->isResistor(device)
&& loop_resistors.find(device) == loop_resistors.end()) {
ParasiticNode *onode = parasitics_->otherNode(device, node);
// One commercial extractor creates resistors with identical from/to nodes.
if (onode != node
&& device != from_res
&& visited_nodes.find(onode) == visited_nodes.end())
checkAnnotation2(drvr_pin, onode, device, loads, visited_nodes);
&& device != from_res) {
if (visited_nodes.find(onode) == visited_nodes.end())
checkAnnotation2(drvr_pin, onode, device, loads,
visited_nodes, loop_resistors);
else
// resistor loop
loop_resistors.insert(device);
}
}
}
delete device_iter;

4
parasitics/ConcreteParasitics.hh
View File

@ -36,6 +36,7 @@ class ConcreteParasiticDevice;
typedef Map<const Pin*, ConcreteParasitic**> ConcreteParasiticMap;
typedef Map<const Net*, ConcreteParasiticNetwork**> ConcreteParasiticNetworkMap;
typedef Set<ParasiticNode*> ParasiticNodeSet;
typedef Set<ParasiticDevice*> ParasiticDeviceSet;
// This class acts as a BUILDER for all parasitics.
class ConcreteParasitics : public Parasitics, public EstimateParasitics
@ -221,7 +222,8 @@ protected:
ParasiticNode *node,
ParasiticDevice *from_res,
PinSet &loads,
ParasiticNodeSet &visited_nodes);
ParasiticNodeSet &visited_nodes,
ParasiticDeviceSet &loop_resistors);
// Driver pin to array of parasitics indexed by analysis pt index
// and transition.