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Sta::findSlewLimit 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2022-04-13 19:35:12 -07:00
parent 4ac0829438
commit f61335a194
4 changed files with 43 additions and 42 deletions
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2
include/sta/Sta.hh
View File

@ -631,7 +631,7 @@ public:
Slew &slew,
float &slack,
float &limit);
void findSlewLimit(const Pin *pin,
void findSlewLimit(const LibertyPort *port,
const Corner *corner,
const MinMax *min_max,
// Return values.

77
search/CheckSlewLimits.cc
View File

@ -166,24 +166,6 @@ CheckSlewLimits::checkSlews1(Vertex *vertex,
}
}
void
CheckSlewLimits::findLimit(const Pin *pin,
const Corner *corner,
const MinMax *min_max,
// Return values.
float &limit,
bool &exists) const
{
limit = INF;
exists = false;
for (auto rf : RiseFall::range()) {
float limit;
bool exists;
findLimit(pin, nullptr, corner, rf, min_max, false,
limit, exists);
}
}
// Return the tightest limit.
void
CheckSlewLimits::findLimit(const Pin *pin,
@ -196,14 +178,12 @@ CheckSlewLimits::findLimit(const Pin *pin,
float &limit,
bool &exists) const
{
exists = false;
const Network *network = sta_->network();
Sdc *sdc = sta_->sdc();
LibertyPort *port = network->libertyPort(pin);
findLimit(port, corner, min_max,
limit, exists);
// Default to top ("design") limit.
Cell *top_cell = network->cell(network->topInstance());
sdc->slewLimit(top_cell, min_max,
limit, exists);
float limit1;
bool exists1;
if (check_clks) {
@ -225,6 +205,7 @@ CheckSlewLimits::findLimit(const Pin *pin,
}
}
}
if (network->isTopLevelPort(pin)) {
Port *port = network->port(pin);
sdc->slewLimit(port, min_max, limit1, exists1);
@ -259,21 +240,41 @@ CheckSlewLimits::findLimit(const Pin *pin,
}
}
}
else {
LibertyPort *port = network->libertyPort(pin);
if (port) {
LibertyPort *corner_port = port->cornerPort(corner->libertyIndex(min_max));
corner_port->slewLimit(min_max, limit1, exists1);
if (!exists1
&& corner_port->direction()->isAnyOutput()
&& min_max == MinMax::max())
corner_port->libertyLibrary()->defaultMaxSlew(limit1, exists1);
if (exists1
&& (!exists
|| min_max->compare(limit, limit1))) {
limit = limit1;
exists = true;
}
}
void
CheckSlewLimits::findLimit(const LibertyPort *port,
const Corner *corner,
const MinMax *min_max,
// Return values.
float &limit,
bool &exists) const
{
limit = INF;
exists = false;
const Network *network = sta_->network();
Sdc *sdc = sta_->sdc();
// Default to top ("design") limit.
Cell *top_cell = network->cell(network->topInstance());
sdc->slewLimit(top_cell, min_max,
limit, exists);
if (port) {
const LibertyPort *corner_port = port->cornerPort(corner->libertyIndex(min_max));
float limit1;
bool exists1;
corner_port->slewLimit(min_max, limit1, exists1);
if (!exists1
&& corner_port->direction()->isAnyOutput()
&& min_max == MinMax::max())
corner_port->libertyLibrary()->defaultMaxSlew(limit1, exists1);
if (exists1
&& (!exists
|| min_max->compare(limit, limit1))) {
limit = limit1;
exists = true;
}
}
}

2
search/CheckSlewLimits.hh
View File

@ -52,7 +52,7 @@ public:
bool violators,
const Corner *corner,
const MinMax *min_max);
void findLimit(const Pin *pin,
void findLimit(const LibertyPort *port,
const Corner *corner,
const MinMax *min_max,
// Return values.

4
search/Sta.cc
View File

@ -5212,7 +5212,7 @@ Sta::maxSlewCheck(// Return values.
}
void
Sta::findSlewLimit(const Pin *pin,
Sta::findSlewLimit(const LibertyPort *port,
const Corner *corner,
const MinMax *min_max,
// Return values.
@ -5220,7 +5220,7 @@ Sta::findSlewLimit(const Pin *pin,
bool &exists)
{
checkSlewLimitPreamble();
check_slew_limits_->findLimit(pin, corner, min_max,
check_slew_limits_->findLimit(port, corner, min_max,
limit, exists);
}