125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
// OpenSTA, Static Timing Analyzer
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// Copyright (c) 2020, Parallax Software, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include "LinearModel.hh"
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#include "Units.hh"
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#include "Liberty.hh"
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namespace sta {
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GateLinearModel::GateLinearModel(float intrinsic,
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float resistance) :
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intrinsic_(intrinsic),
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resistance_(resistance)
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{
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}
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void
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GateLinearModel::gateDelay(const LibertyCell *,
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const Pvt *,
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float,
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float load_cap,
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float,
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bool,
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// return values
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ArcDelay &gate_delay,
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Slew &drvr_slew) const
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{
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gate_delay = intrinsic_ + resistance_ * load_cap;
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drvr_slew = 0.0;
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}
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void
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GateLinearModel::reportGateDelay(const LibertyCell *cell,
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const Pvt *,
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float,
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float load_cap,
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float,
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bool,
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int digits,
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string *result) const
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{
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const LibertyLibrary *library = cell->libertyLibrary();
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const Units *units = library->units();
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const Unit *time_unit = units->timeUnit();
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const Unit *res_unit = units->resistanceUnit();
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const Unit *cap_unit = units->capacitanceUnit();
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*result += "Delay = ";
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*result += time_unit->asString(intrinsic_, digits);
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*result += " + ";
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*result += res_unit->asString(resistance_, digits);
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*result += " * ";
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*result += cap_unit->asString(load_cap, digits);
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*result += " = ";
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float delay = intrinsic_ + resistance_ * load_cap;
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*result += time_unit->asString(delay, digits);
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}
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float
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GateLinearModel::driveResistance(const LibertyCell *,
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const Pvt *) const
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{
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return resistance_;
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}
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void
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GateLinearModel::setIsScaled(bool)
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{
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}
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CheckLinearModel::CheckLinearModel(float intrinsic) :
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intrinsic_(intrinsic)
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{
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}
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void
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CheckLinearModel::checkDelay(const LibertyCell *,
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const Pvt *,
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float,
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float,
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float,
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bool,
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ArcDelay &margin) const
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{
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margin = intrinsic_;
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}
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void
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CheckLinearModel::reportCheckDelay(const LibertyCell *cell,
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const Pvt *,
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float,
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const char *,
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float,
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float,
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bool,
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int digits,
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string *result) const
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{
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const LibertyLibrary *library = cell->libertyLibrary();
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const Units *units = library->units();
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const Unit *time_unit = units->timeUnit();
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*result += "Check = ";
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*result += time_unit->asString(intrinsic_, digits);
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}
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void
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CheckLinearModel::setIsScaled(bool)
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{
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}
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} // namespace
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