141 lines
3.8 KiB
C++
141 lines
3.8 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 <vector>
|
|
|
|
#include "LibertyClass.hh"
|
|
#include "NetworkClass.hh"
|
|
|
|
namespace sta {
|
|
|
|
enum class StateInputValue {
|
|
low,
|
|
high,
|
|
dont_care,
|
|
low_high,
|
|
high_low,
|
|
rise,
|
|
fall,
|
|
not_rise,
|
|
not_fall
|
|
};
|
|
|
|
enum class StateInternalValue {
|
|
low,
|
|
high,
|
|
unspecified,
|
|
low_high,
|
|
high_low,
|
|
unknown,
|
|
hold
|
|
};
|
|
|
|
class StatetableRow;
|
|
|
|
typedef std::vector<StateInputValue> StateInputValues;
|
|
typedef std::vector<StateInternalValue> StateInternalValues;
|
|
|
|
// Register/Latch
|
|
class Sequential
|
|
{
|
|
public:
|
|
~Sequential();
|
|
bool isLatch() const { return !is_register_; }
|
|
bool isRegister() const { return is_register_; }
|
|
FuncExpr *clock() const { return clock_; }
|
|
FuncExpr *data() const { return data_; }
|
|
FuncExpr *clear() const { return clear_; }
|
|
FuncExpr *preset() const { return preset_; }
|
|
// State of output when clear and preset are both true.
|
|
LogicValue clearPresetOutput() const { return clr_preset_out_; }
|
|
// State of outputInv when clear and preset are both true.
|
|
LogicValue clearPresetOutputInv() const {return clr_preset_out_inv_;}
|
|
LibertyPort *output() const { return output_; }
|
|
LibertyPort *outputInv() const { return output_inv_; }
|
|
|
|
protected:
|
|
// clock/data are:
|
|
// clocked_on/next_state for registers
|
|
// enable/data for latches
|
|
Sequential(bool is_register,
|
|
FuncExpr *clock,
|
|
FuncExpr *data,
|
|
FuncExpr *clear,
|
|
FuncExpr *preset,
|
|
LogicValue clr_preset_out,
|
|
LogicValue clr_preset_out_inv,
|
|
LibertyPort *output,
|
|
LibertyPort *output_inv);
|
|
|
|
bool is_register_;
|
|
FuncExpr *clock_;
|
|
FuncExpr *data_;
|
|
FuncExpr *clear_;
|
|
FuncExpr *preset_;
|
|
LogicValue clr_preset_out_;
|
|
LogicValue clr_preset_out_inv_;
|
|
LibertyPort *output_;
|
|
LibertyPort *output_inv_;
|
|
|
|
friend class LibertyCell;
|
|
};
|
|
|
|
class Statetable
|
|
{
|
|
public:
|
|
const LibertyPortSeq &inputPorts() const { return input_ports_; }
|
|
const LibertyPortSeq &internalPorts() const { return internal_ports_; }
|
|
const StatetableRows &table() const { return table_; }
|
|
|
|
protected:
|
|
Statetable(LibertyPortSeq &input_ports,
|
|
LibertyPortSeq &internal_ports,
|
|
StatetableRows &table);
|
|
LibertyPortSeq input_ports_;
|
|
LibertyPortSeq internal_ports_;
|
|
StatetableRows table_;
|
|
|
|
friend class LibertyCell;
|
|
};
|
|
|
|
class StatetableRow
|
|
{
|
|
public:
|
|
StatetableRow(StateInputValues &input_values,
|
|
StateInternalValues ¤t_values,
|
|
StateInternalValues &next_values);
|
|
const StateInputValues &inputValues() const { return input_values_; }
|
|
const StateInternalValues ¤tValues() const { return current_values_; }
|
|
const StateInternalValues &nextValues() const { return next_values_; }
|
|
|
|
private:
|
|
StateInputValues input_values_;
|
|
StateInternalValues current_values_;
|
|
StateInternalValues next_values_;
|
|
};
|
|
|
|
} // namespace
|