102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
// OpenSTA, Static Timing Analyzer
|
|
// Copyright (c) 2025, Parallax Software, Inc.
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 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, see <https://www.gnu.org/licenses/>.
|
|
//
|
|
// The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software.
|
|
//
|
|
// Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
//
|
|
// This notice may not be removed or altered from any source distribution.
|
|
|
|
#pragma once
|
|
|
|
#include "LibertyClass.hh"
|
|
#include "LumpedCapDelayCalc.hh"
|
|
|
|
namespace sta {
|
|
|
|
class DmpAlg;
|
|
class DmpCap;
|
|
class DmpPi;
|
|
class DmpZeroC2;
|
|
class GateTableModel;
|
|
|
|
// Delay calculator using Dartu/Menezes/Pileggi effective capacitance
|
|
// algorithm for RSPF loads.
|
|
class DmpCeffDelayCalc : public LumpedCapDelayCalc
|
|
{
|
|
public:
|
|
DmpCeffDelayCalc(StaState *sta);
|
|
virtual ~DmpCeffDelayCalc();
|
|
bool reduceSupported() const override { return true; }
|
|
ArcDcalcResult gateDelay(const Pin *drvr_pin,
|
|
const TimingArc *arc,
|
|
const Slew &in_slew,
|
|
float load_cap,
|
|
const Parasitic *parasitic,
|
|
const LoadPinIndexMap &load_pin_index_map,
|
|
const DcalcAnalysisPt *dcalc_ap) override;
|
|
std::string reportGateDelay(const Pin *drvr_pin,
|
|
const TimingArc *arc,
|
|
const Slew &in_slew,
|
|
float load_cap,
|
|
const Parasitic *parasitic,
|
|
const LoadPinIndexMap &load_pin_index_map,
|
|
const DcalcAnalysisPt *dcalc_ap,
|
|
int digits) override;
|
|
void copyState(const StaState *sta) override;
|
|
|
|
protected:
|
|
virtual void loadDelaySlew(const Pin *load_pin,
|
|
double drvr_slew,
|
|
const RiseFall *rf,
|
|
const LibertyLibrary *drvr_library,
|
|
const Parasitic *parasitic,
|
|
// Return values.
|
|
ArcDelay &wire_delay,
|
|
Slew &load_slew) = 0;
|
|
void gateDelaySlew(// Return values.
|
|
double &delay,
|
|
double &slew);
|
|
void loadDelaySlewElmore(const Pin *load_pin,
|
|
double elmore,
|
|
ArcDelay &delay,
|
|
Slew &slew);
|
|
// Select the appropriate special case Dartu/Menezes/Pileggi algorithm.
|
|
void setCeffAlgorithm(const LibertyLibrary *library,
|
|
const LibertyCell *cell,
|
|
const Pvt *pvt,
|
|
const GateTableModel *gate_model,
|
|
const RiseFall *rf,
|
|
double in_slew,
|
|
double c2,
|
|
double rpi,
|
|
double c1);
|
|
|
|
static bool unsuppored_model_warned_;
|
|
|
|
private:
|
|
// Dmp algorithms for each special pi model case.
|
|
// These objects are reused to minimize make/deletes.
|
|
DmpCap *dmp_cap_;
|
|
DmpPi *dmp_pi_;
|
|
DmpZeroC2 *dmp_zero_c2_;
|
|
DmpAlg *dmp_alg_;
|
|
};
|
|
|
|
} // namespace
|