99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
// OpenSTA, Static Timing Analyzer
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// Copyright (c) 2025, 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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//
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// The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software.
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//
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// Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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//
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// This notice may not be removed or altered from any source distribution.
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#pragma once
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#include "StaState.hh"
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#include "LibertyClass.hh"
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#include "NetworkClass.hh"
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#include "SdcClass.hh"
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#include "ParasiticsClass.hh"
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namespace sta {
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class Corner;
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class StaState;
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class EstimateParasitics : public StaState
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{
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public:
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EstimateParasitics(StaState *sta);
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// Helper function for wireload estimation.
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void estimatePiElmore(const Pin *drvr_pin,
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const RiseFall *rf,
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const Wireload *wireload,
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float fanout,
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float net_pin_cap,
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const Corner *corner,
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const MinMax *min_max,
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// Return values.
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float &c2,
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float &rpi,
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float &c1,
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float &elmore_res,
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float &elmore_cap,
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bool &elmore_use_load_cap);
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protected:
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void estimatePiElmoreBest(const Pin *drvr_pin,
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float net_pin_cap,
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float wireload_cap,
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const RiseFall *rf,
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const Corner *corner,
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const MinMax *min_max,
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// Return values.
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float &c2,
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float &rpi,
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float &c1,
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float &elmore_res,
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float &elmore_cap,
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bool &elmore_use_load_cap) const;
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void estimatePiElmoreWorst(const Pin *drvr_pin,
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float wireload_cap,
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float wireload_res,
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float fanout,
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float net_pin_cap,
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const RiseFall *rf,
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const Corner *corner,
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const MinMax *min_max,
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// Return values.
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float &c2, float &rpi, float &c1,
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float &elmore_res, float &elmore_cap,
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bool &elmore_use_load_cap);
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void estimatePiElmoreBalanced(const Pin *drvr_pin,
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float wireload_cap,
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float wireload_res,
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float fanout,
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float net_pin_cap,
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const RiseFall *rf,
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const Corner *corner,
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const MinMax *min_max,
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// Return values.
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float &c2, float &rpi, float &c1,
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float &elmore_res, float &elmore_cap,
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bool &elmore_use_load_cap);
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};
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} // namespace
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