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OpenSTA/liberty/TableModel.cc

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// OpenSTA, Static Timing Analyzer
// Copyright (c) 2023, 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/>.
#include "TableModel.hh"
#include <string>
#include "Error.hh"
#include "EnumNameMap.hh"
#include "Units.hh"
#include "Liberty.hh"
namespace sta {
using std::string;
using std::min;
using std::max;
using std::abs;
using std::make_shared;
static void
deleteSigmaModels(TableModel *models[EarlyLate::index_count]);
static string
reportPvt(const LibertyCell *cell,
const Pvt *pvt,
int digits);
static void
appendSpaces(string &result,
int count);
TimingModel::TimingModel(LibertyCell *cell) :
cell_(cell)
{
}
GateTableModel::GateTableModel(LibertyCell *cell,
TableModel *delay_model,
TableModel *delay_sigma_models[EarlyLate::index_count],
TableModel *slew_model,
TableModel *slew_sigma_models[EarlyLate::index_count],
ReceiverModelPtr receiver_model,
OutputWaveforms *output_waveforms) :
GateTimingModel(cell),
delay_model_(delay_model),
slew_model_(slew_model),
receiver_model_(receiver_model),
output_waveforms_(output_waveforms)
{
for (auto el_index : EarlyLate::rangeIndex()) {
slew_sigma_models_[el_index] = slew_sigma_models
? slew_sigma_models[el_index]
: nullptr;
delay_sigma_models_[el_index] = delay_sigma_models
? delay_sigma_models[el_index]
: nullptr;
}
}
GateTableModel::~GateTableModel()
{
delete delay_model_;
delete slew_model_;
delete output_waveforms_;
deleteSigmaModels(slew_sigma_models_);
deleteSigmaModels(delay_sigma_models_);
}
static void
deleteSigmaModels(TableModel *models[EarlyLate::index_count])
{
TableModel *early_model = models[EarlyLate::earlyIndex()];
TableModel *late_model = models[EarlyLate::lateIndex()];
if (early_model == late_model)
delete early_model;
else {
delete early_model;
delete late_model;
}
}
void
GateTableModel::setIsScaled(bool is_scaled)
{
if (delay_model_)
delay_model_->setIsScaled(is_scaled);
if (slew_model_)
slew_model_->setIsScaled(is_scaled);
}
void
GateTableModel::gateDelay(const Pvt *pvt,
float in_slew,
float load_cap,
float related_out_cap,
bool pocv_enabled,
// return values
ArcDelay &gate_delay,
Slew &drvr_slew) const
{
float delay = findValue(pvt, delay_model_, in_slew, load_cap, related_out_cap);
float sigma_early = 0.0;
float sigma_late = 0.0;
if (pocv_enabled && delay_sigma_models_[EarlyLate::earlyIndex()])
sigma_early = findValue(pvt, delay_sigma_models_[EarlyLate::earlyIndex()],
in_slew, load_cap, related_out_cap);
if (pocv_enabled && delay_sigma_models_[EarlyLate::lateIndex()])
sigma_late = findValue(pvt, delay_sigma_models_[EarlyLate::lateIndex()],
in_slew, load_cap, related_out_cap);
gate_delay = makeDelay(delay, sigma_early, sigma_late);
float slew = findValue(pvt, slew_model_, in_slew, load_cap, related_out_cap);
if (pocv_enabled && slew_sigma_models_[EarlyLate::earlyIndex()])
sigma_early = findValue(pvt, slew_sigma_models_[EarlyLate::earlyIndex()],
in_slew, load_cap, related_out_cap);
if (pocv_enabled && slew_sigma_models_[EarlyLate::lateIndex()])
sigma_late = findValue(pvt, slew_sigma_models_[EarlyLate::lateIndex()],
in_slew, load_cap, related_out_cap);
// Clip negative slews to zero.
if (slew < 0.0)
slew = 0.0;
drvr_slew = makeDelay(slew, sigma_early, sigma_late);
}
string
GateTableModel::reportGateDelay(const Pvt *pvt,
float in_slew,
float load_cap,
float related_out_cap,
bool pocv_enabled,
int digits) const
{
string result = reportPvt(cell_, pvt, digits);
result += reportTableLookup("Delay", pvt, delay_model_, in_slew,
load_cap, related_out_cap, digits);
if (pocv_enabled && delay_sigma_models_[EarlyLate::earlyIndex()])
result += reportTableLookup("Delay sigma(early)", pvt,
delay_sigma_models_[EarlyLate::earlyIndex()],
in_slew, load_cap, related_out_cap, digits);
if (pocv_enabled && delay_sigma_models_[EarlyLate::lateIndex()])
result += reportTableLookup("Delay sigma(late)", pvt,
delay_sigma_models_[EarlyLate::lateIndex()],
in_slew, load_cap, related_out_cap, digits);
result += '\n';
result += reportTableLookup("Slew", pvt, slew_model_, in_slew,
load_cap, related_out_cap, digits);
if (pocv_enabled && slew_sigma_models_[EarlyLate::earlyIndex()])
result += reportTableLookup("Slew sigma(early)", pvt,
slew_sigma_models_[EarlyLate::earlyIndex()],
in_slew, load_cap, related_out_cap, digits);
if (pocv_enabled && slew_sigma_models_[EarlyLate::lateIndex()])
result += reportTableLookup("Slew sigma(late)", pvt,
slew_sigma_models_[EarlyLate::lateIndex()],
in_slew, load_cap, related_out_cap, digits);
float drvr_slew = findValue(pvt, slew_model_, in_slew, load_cap, related_out_cap);
if (drvr_slew < 0.0)
result += "Negative slew clipped to 0.0\n";
return result;
}
string
GateTableModel::reportTableLookup(const char *result_name,
const Pvt *pvt,
const TableModel *model,
float in_slew,
float load_cap,
float related_out_cap,
int digits) const
{
if (model) {
float axis_value1, axis_value2, axis_value3;
findAxisValues(model, in_slew, load_cap, related_out_cap,
axis_value1, axis_value2, axis_value3);
const LibertyLibrary *library = cell_->libertyLibrary();
return model->reportValue(result_name, cell_, pvt, axis_value1, nullptr,
axis_value2, axis_value3,
library->units()->timeUnit(), digits);
}
return "";
}
float
GateTableModel::findValue(const Pvt *pvt,
const TableModel *model,
float in_slew,
float load_cap,
float related_out_cap) const
{
if (model) {
float axis_value1, axis_value2, axis_value3;
findAxisValues(model, in_slew, load_cap, related_out_cap,
axis_value1, axis_value2, axis_value3);
return model->findValue(cell_, pvt, axis_value1, axis_value2, axis_value3);
}
else
return 0.0;
}
void
GateTableModel::findAxisValues(const TableModel *model,
float in_slew,
float load_cap,
float related_out_cap,
// Return values.
float &axis_value1,
float &axis_value2,
float &axis_value3) const
{
switch (model->order()) {
case 0:
axis_value1 = 0.0;
axis_value2 = 0.0;
axis_value3 = 0.0;
break;
case 1:
axis_value1 = axisValue(model->axis1(), in_slew, load_cap,
related_out_cap);
axis_value2 = 0.0;
axis_value3 = 0.0;
break;
case 2:
axis_value1 = axisValue(model->axis1(), in_slew, load_cap,
related_out_cap);
axis_value2 = axisValue(model->axis2(), in_slew, load_cap,
related_out_cap);
axis_value3 = 0.0;
break;
case 3:
axis_value1 = axisValue(model->axis1(), in_slew, load_cap,
related_out_cap);
axis_value2 = axisValue(model->axis2(), in_slew, load_cap,
related_out_cap);
axis_value3 = axisValue(model->axis3(), in_slew, load_cap,
related_out_cap);
break;
default:
axis_value1 = 0.0;
axis_value2 = 0.0;
axis_value3 = 0.0;
criticalError(239, "unsupported table order");
}
}
// Use slew/Cload for the highest Cload, which approximates output
// admittance as the "drive".
float
GateTableModel::driveResistance(const Pvt *pvt) const
{
float slew, cap;
maxCapSlew(0.0, pvt, slew, cap);
return slew / cap;
}
void
GateTableModel::maxCapSlew(float in_slew,
const Pvt *pvt,
float &slew,
float &cap) const
{
const TableAxis *axis1 = slew_model_->axis1();
const TableAxis *axis2 = slew_model_->axis2();
const TableAxis *axis3 = slew_model_->axis3();
if (axis1
&& axis1->variable() == TableAxisVariable::total_output_net_capacitance) {
cap = axis1->axisValue(axis1->size() - 1);
slew = findValue(pvt, slew_model_, in_slew, cap, 0.0);
}
else if (axis2
&& axis2->variable()==TableAxisVariable::total_output_net_capacitance) {
cap = axis2->axisValue(axis2->size() - 1);
slew = findValue(pvt, slew_model_, in_slew, cap, 0.0);
}
else if (axis3
&& axis3->variable()==TableAxisVariable::total_output_net_capacitance) {
cap = axis3->axisValue(axis3->size() - 1);
slew = findValue(pvt, slew_model_, in_slew, cap, 0.0);
}
else {
// Table not dependent on capacitance.
cap = 1.0;
slew = 0.0;
}
// Clip negative slews to zero.
if (slew < 0.0)
slew = 0.0;
}
float
GateTableModel::axisValue(const TableAxis *axis,
float in_slew,
float load_cap,
float related_out_cap) const
{
TableAxisVariable var = axis->variable();
if (var == TableAxisVariable::input_transition_time
|| var == TableAxisVariable::input_net_transition)
return in_slew;
else if (var == TableAxisVariable::total_output_net_capacitance)
return load_cap;
else if (var == TableAxisVariable::related_out_total_output_net_capacitance)
return related_out_cap;
else {
criticalError(240, "unsupported table axes");
return 0.0;
}
}
bool
GateTableModel::checkAxes(const TablePtr &table)
{
const TableAxis *axis1 = table->axis1();
const TableAxis *axis2 = table->axis2();
const TableAxis *axis3 = table->axis3();
bool axis_ok = true;
if (axis1)
axis_ok &= checkAxis(axis1);
if (axis2)
axis_ok &= checkAxis(axis2);
if (axis3)
axis_ok &= checkAxis(axis3);
return axis_ok;
}
bool
GateTableModel::checkAxis(const TableAxis *axis)
{
TableAxisVariable var = axis->variable();
return var == TableAxisVariable::total_output_net_capacitance
|| var == TableAxisVariable::input_transition_time
|| var == TableAxisVariable::input_net_transition
|| var == TableAxisVariable::related_out_total_output_net_capacitance;
}
////////////////////////////////////////////////////////////////
ReceiverModel::ReceiverModel() :
capacitance_models_{{nullptr, nullptr}, {nullptr, nullptr}}
{
}
ReceiverModel::~ReceiverModel()
{
for (int index = 0; index < 2; index++) {
for (auto rf_index : RiseFall::rangeIndex())
delete capacitance_models_[index][rf_index];
}
}
void
ReceiverModel::setCapacitanceModel(TableModel *table_model,
int index,
RiseFall *rf)
{
capacitance_models_[index][rf->index()] = table_model;
}
bool
ReceiverModel::checkAxes(TablePtr table)
{
const TableAxis *axis1 = table->axis1();
const TableAxis *axis2 = table->axis2();
const TableAxis *axis3 = table->axis3();
return (axis1 && axis1->variable() == TableAxisVariable::input_net_transition
&& axis2 == nullptr
&& axis3 == nullptr)
|| (axis1 && axis1->variable() == TableAxisVariable::input_net_transition
&& axis2 && axis2->variable() == TableAxisVariable::total_output_net_capacitance
&& axis3 == nullptr)
|| (axis1 && axis1->variable() == TableAxisVariable::total_output_net_capacitance
&& axis2 && axis2->variable() == TableAxisVariable::input_net_transition
&& axis3 == nullptr);
}
////////////////////////////////////////////////////////////////
CheckTableModel::CheckTableModel(LibertyCell *cell,
TableModel *model,
TableModel *sigma_models[EarlyLate::index_count]) :
CheckTimingModel(cell),
model_(model)
{
for (auto el_index : EarlyLate::rangeIndex())
sigma_models_[el_index] = sigma_models ? sigma_models[el_index] : nullptr;
}
CheckTableModel::~CheckTableModel()
{
delete model_;
deleteSigmaModels(sigma_models_);
}
void
CheckTableModel::setIsScaled(bool is_scaled)
{
model_->setIsScaled(is_scaled);
}
void
CheckTableModel::checkDelay(const Pvt *pvt,
float from_slew,
float to_slew,
float related_out_cap,
bool pocv_enabled,
// Return values.
ArcDelay &margin) const
{
if (model_) {
float mean = findValue(pvt, model_, from_slew, to_slew, related_out_cap);
float sigma_early = 0.0;
float sigma_late = 0.0;
if (pocv_enabled && sigma_models_[EarlyLate::earlyIndex()])
sigma_early = findValue(pvt, sigma_models_[EarlyLate::earlyIndex()],
from_slew, to_slew, related_out_cap);
if (pocv_enabled && sigma_models_[EarlyLate::lateIndex()])
sigma_late = findValue(pvt, sigma_models_[EarlyLate::lateIndex()],
from_slew, to_slew, related_out_cap);
margin = makeDelay(mean, sigma_early, sigma_late);
}
else
margin = 0.0;
}
float
CheckTableModel::findValue(const Pvt *pvt,
const TableModel *model,
float from_slew,
float to_slew,
float related_out_cap) const
{
if (model) {
float axis_value1, axis_value2, axis_value3;
findAxisValues(from_slew, to_slew, related_out_cap,
axis_value1, axis_value2, axis_value3);
return model->findValue(cell_, pvt, axis_value1, axis_value2, axis_value3);
}
else
return 0.0;
}
string
CheckTableModel::reportCheckDelay(const Pvt *pvt,
float from_slew,
const char *from_slew_annotation,
float to_slew,
float related_out_cap,
bool pocv_enabled,
int digits) const
{
string result = reportTableDelay("Check", pvt, model_,
from_slew, from_slew_annotation, to_slew,
related_out_cap, digits);
if (pocv_enabled && sigma_models_[EarlyLate::earlyIndex()])
result += reportTableDelay("Check sigma early", pvt,
sigma_models_[EarlyLate::earlyIndex()],
from_slew, from_slew_annotation, to_slew,
related_out_cap, digits);
if (pocv_enabled && sigma_models_[EarlyLate::lateIndex()])
result += reportTableDelay("Check sigma late", pvt,
sigma_models_[EarlyLate::lateIndex()],
from_slew, from_slew_annotation, to_slew,
related_out_cap, digits);
return result;
}
string
CheckTableModel::reportTableDelay(const char *result_name,
const Pvt *pvt,
const TableModel *model,
float from_slew,
const char *from_slew_annotation,
float to_slew,
float related_out_cap,
int digits) const
{
if (model) {
float axis_value1, axis_value2, axis_value3;
findAxisValues(from_slew, to_slew, related_out_cap,
axis_value1, axis_value2, axis_value3);
string result = reportPvt(cell_, pvt, digits);
result += model_->reportValue(result_name, cell_, pvt,
axis_value1, from_slew_annotation, axis_value2,
axis_value3,
cell_->libertyLibrary()->units()->timeUnit(), digits);
return result;
}
return "";
}
void
CheckTableModel::findAxisValues(float from_slew,
float to_slew,
float related_out_cap,
// Return values.
float &axis_value1,
float &axis_value2,
float &axis_value3) const
{
switch (model_->order()) {
case 0:
axis_value1 = 0.0;
axis_value2 = 0.0;
axis_value3 = 0.0;
break;
case 1:
axis_value1 = axisValue(model_->axis1(), from_slew, to_slew,
related_out_cap);
axis_value2 = 0.0;
axis_value3 = 0.0;
break;
case 2:
axis_value1 = axisValue(model_->axis1(), from_slew, to_slew,
related_out_cap);
axis_value2 = axisValue(model_->axis2(), from_slew, to_slew,
related_out_cap);
axis_value3 = 0.0;
break;
case 3:
axis_value1 = axisValue(model_->axis1(), from_slew, to_slew,
related_out_cap);
axis_value2 = axisValue(model_->axis2(), from_slew, to_slew,
related_out_cap);
axis_value3 = axisValue(model_->axis3(), from_slew, to_slew,
related_out_cap);
break;
default:
criticalError(241, "unsupported table order");
}
}
float
CheckTableModel::axisValue(const TableAxis *axis,
float from_slew,
float to_slew,
float related_out_cap) const
{
TableAxisVariable var = axis->variable();
if (var == TableAxisVariable::related_pin_transition)
return from_slew;
else if (var == TableAxisVariable::constrained_pin_transition)
return to_slew;
else if (var == TableAxisVariable::related_out_total_output_net_capacitance)
return related_out_cap;
else {
criticalError(242, "unsupported table axes");
return 0.0;
}
}
bool
CheckTableModel::checkAxes(const TablePtr table)
{
const TableAxis *axis1 = table->axis1();
const TableAxis *axis2 = table->axis2();
const TableAxis *axis3 = table->axis3();
bool axis_ok = true;
if (axis1)
axis_ok &= checkAxis(axis1);
if (axis2)
axis_ok &= checkAxis(axis2);
if (axis3)
axis_ok &= checkAxis(axis3);
return axis_ok;
}
bool
CheckTableModel::checkAxis(const TableAxis *axis)
{
TableAxisVariable var = axis->variable();
return var == TableAxisVariable::constrained_pin_transition
|| var == TableAxisVariable::related_pin_transition
|| var == TableAxisVariable::related_out_total_output_net_capacitance;
}
////////////////////////////////////////////////////////////////
TableModel::TableModel(TablePtr table,
TableTemplate *tbl_template,
ScaleFactorType scale_factor_type,
const RiseFall *rf) :
table_(table),
tbl_template_(tbl_template),
scale_factor_type_(int(scale_factor_type)),
rf_index_(rf->index()),
is_scaled_(false)
{
}
int
TableModel::order() const
{
return table_->order();
}
void
TableModel::setScaleFactorType(ScaleFactorType type)
{
scale_factor_type_ = int(type);
}
void
TableModel::setIsScaled(bool is_scaled)
{
is_scaled_ = is_scaled;
}
const TableAxis *
TableModel::axis1() const
{
return table_->axis1();
}
const TableAxis *
TableModel::axis2() const
{
return table_->axis2();
}
const TableAxis *
TableModel::axis3() const
{
return table_->axis3();
}
float
TableModel::value(size_t axis_index1,
size_t axis_index2,
size_t axis_index3) const
{
return table_->value(axis_index1, axis_index2, axis_index3);
}
float
TableModel::findValue(float axis_value1,
float axis_value2,
float axis_value3) const
{
return table_->findValue(axis_value1, axis_value2, axis_value3);
}
float
TableModel::findValue(const LibertyCell *cell,
const Pvt *pvt,
float axis_value1,
float axis_value2,
float axis_value3) const
{
return table_->findValue(axis_value1, axis_value2, axis_value3)
* scaleFactor(cell, pvt);
}
float
TableModel::scaleFactor(const LibertyCell *cell,
const Pvt *pvt) const
{
if (is_scaled_)
// Scaled tables are not derated because scale factors are wrt
// nominal pvt.
return 1.0F;
else
return cell->libertyLibrary()->scaleFactor(static_cast<ScaleFactorType>(scale_factor_type_),
rf_index_, cell, pvt);
}
string
TableModel::reportValue(const char *result_name,
const LibertyCell *cell,
const Pvt *pvt,
float value1,
const char *comment1,
float value2,
float value3,
const Unit *table_unit,
int digits) const
{
string result = table_->reportValue("Table value", cell, pvt, value1,
comment1, value2, value3, table_unit, digits);
result += reportPvtScaleFactor(cell, pvt, digits);
result += result_name;
result += " = ";
result += table_unit->asString(findValue(cell, pvt, value1, value2, value3), digits);
result += '\n';
return result;
}
static string
reportPvt(const LibertyCell *cell,
const Pvt *pvt,
int digits)
{
const LibertyLibrary *library = cell->libertyLibrary();
if (pvt == nullptr)
pvt = library->defaultOperatingConditions();
if (pvt) {
string result;
stringPrint(result, "P = %.*f V = %.*f T = %.*f\n",
digits, pvt->process(),
digits, pvt->voltage(),
digits, pvt->temperature());
return result;
}
return "";
}
string
TableModel::reportPvtScaleFactor(const LibertyCell *cell,
const Pvt *pvt,
int digits) const
{
if (pvt == nullptr)
pvt = cell->libertyLibrary()->defaultOperatingConditions();
if (pvt) {
string result;
stringPrint(result, "PVT scale factor = %.*f\n",
digits,
scaleFactor(cell, pvt));
return result;
}
return "";
}
////////////////////////////////////////////////////////////////
Table0::Table0(float value) :
Table(),
value_(value)
{
}
float
Table0::value(size_t,
size_t,
size_t) const
{
return value_;
}
float
Table0::findValue(float,
float,
float) const
{
return value_;
}
string
Table0::reportValue(const char *result_name,
const LibertyCell *,
const Pvt *,
float value1,
const char *comment1,
float value2,
float value3,
const Unit *table_unit,
int digits) const
{
string result = result_name;
result += " constant = ";
result += table_unit->asString(findValue(value1, value2, value3), digits);
if (comment1)
result += comment1;
result += '\n';
return result;
}
void
Table0::report(const Units *units,
Report *report) const
{
int digits = 4;
const Unit *table_unit = units->timeUnit();
report->reportLine("%s", table_unit->asString(value_, digits));
}
////////////////////////////////////////////////////////////////
Table1::Table1() :
Table(),
values_(nullptr),
axis1_(nullptr)
{
}
Table1::Table1(FloatSeq *values,
TableAxisPtr axis1) :
Table(),
values_(values),
axis1_(axis1)
{
}
Table1::Table1(Table1 &&table) :
Table(),
values_(table.values_),
axis1_(table.axis1_)
{
table.values_ = nullptr;
table.axis1_ = nullptr;
}
Table1::~Table1()
{
delete values_;
}
Table1 &
Table1::operator=(Table1 &&table)
{
values_ = table.values_;
axis1_ = table.axis1_;
table.values_ = nullptr;
table.axis1_ = nullptr;
return *this;
}
float
Table1::value(size_t axis_index1,
size_t,
size_t) const
{
return value(axis_index1);
}
float
Table1::value(size_t axis_index1) const
{
return (*values_)[axis_index1];
}
float
Table1::findValue(float axis_value1,
float,
float) const
{
return findValue(axis_value1);
}
float
Table1::findValue(float axis_value1) const
{
if (axis1_->size() == 1)
return this->value(axis_value1);
else {
size_t axis_index1 = axis1_->findAxisIndex(axis_value1);
float x1 = axis_value1;
float x1l = axis1_->axisValue(axis_index1);
float x1u = axis1_->axisValue(axis_index1 + 1);
float y1 = this->value(axis_index1);
float y2 = this->value(axis_index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
return (1 - dx1) * y1 + dx1 * y2;
}
}
float
Table1::findValueClip(float axis_value1) const
{
if (axis1_->size() == 1)
return this->value(axis_value1);
else {
size_t axis_index1 = axis1_->findAxisIndex(axis_value1);
float x1 = axis_value1;
float x1l = axis1_->axisValue(axis_index1);
float x1u = axis1_->axisValue(axis_index1 + 1);
if (x1 < x1l)
return this->value(0);
else if (x1 > x1u)
return this->value(axis1_->size() - 1);
else {
float y1 = this->value(axis_index1);
float y2 = this->value(axis_index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
return (1 - dx1) * y1 + dx1 * y2;
}
}
}
float
Table1::findValueClipZero(float axis_value1) const
{
if (axis1_->size() == 1)
return this->value(axis_value1);
else {
size_t axis_index1 = axis1_->findAxisIndex(axis_value1);
float x1 = axis_value1;
float x1l = axis1_->axisValue(axis_index1);
float x1u = axis1_->axisValue(axis_index1 + 1);
if (x1 < x1l || x1 > x1u)
return 0.0;
else {
float y1 = this->value(axis_index1);
float y2 = this->value(axis_index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
return (1 - dx1) * y1 + dx1 * y2;
}
}
}
string
Table1::reportValue(const char *result_name,
const LibertyCell *cell,
const Pvt *,
float value1,
const char *comment1,
float value2,
float value3,
const Unit *table_unit,
int digits) const
{
const Units *units = cell->libertyLibrary()->units();
const Unit *unit1 = axis1_->unit(units);
string result = "Table is indexed by\n ";
result += axis1_->variableString();
result += " = ";
result += unit1->asString(value1, digits);
if (comment1)
result += comment1;
result += '\n';
if (axis1_->size() != 1) {
size_t index1 = axis1_->findAxisIndex(value1);
result += " ";
result += unit1->asString(axis1_->axisValue(index1), digits);
result += " ";
result += unit1->asString(axis1_->axisValue(index1 + 1), digits);
result += '\n';
result += " --------------------\n";
result += "| ";
result += table_unit->asString(value(index1), digits);
result += " ";
result += table_unit->asString(value(index1 + 1),
digits);
result += '\n';
}
result += result_name;
result += " = ";
result += table_unit->asString(findValue(value1, value2, value3), digits);
result += '\n';
return result;
}
void
Table1::report(const Units *units,
Report *report) const
{
int digits = 4;
const Unit *unit1 = axis1_->unit(units);
const Unit *table_unit = units->timeUnit();
report->reportLine("%s", tableVariableString(axis1_->variable()));
report->reportLine("------------------------------");
string line;
for (size_t index1 = 0; index1 < axis1_->size(); index1++) {
line += unit1->asString(axis1_->axisValue(index1), digits);
line += " ";
}
report->reportLineString(line);
line.clear();
for (size_t index1 = 0; index1 < axis1_->size(); index1++) {
line += table_unit->asString(value(index1), digits);
line += " ";
}
report->reportLineString(line);
}
////////////////////////////////////////////////////////////////
Table2::Table2(FloatTable *values,
TableAxisPtr axis1,
TableAxisPtr axis2) :
Table(),
values_(values),
axis1_(axis1),
axis2_(axis2)
{
}
Table2::~Table2()
{
values_->deleteContents();
delete values_;
}
float
Table2::value(size_t axis_index1,
size_t axis_index2,
size_t) const
{
return value(axis_index1, axis_index2);
}
float
Table2::value(size_t axis_index1,
size_t axis_index2) const
{
FloatSeq *row = (*values_)[axis_index1];
return (*row)[axis_index2];
}
// Bilinear Interpolation.
float
Table2::findValue(float axis_value1,
float axis_value2,
float) const
{
size_t size1 = axis1_->size();
size_t size2 = axis2_->size();
if (size1 == 1) {
if (size2 == 1)
return value(0, 0);
else {
size_t axis_index2 = axis2_->findAxisIndex(axis_value2);
float x2 = axis_value2;
float y00 = value(0, axis_index2);
float x2l = axis2_->axisValue(axis_index2);
float x2u = axis2_->axisValue(axis_index2 + 1);
float dx2 = (x2 - x2l) / (x2u - x2l);
float y01 = value(0, axis_index2 + 1);
float tbl_value
= (1 - dx2) * y00
+ dx2 * y01;
return tbl_value;
}
}
else if (size2 == 1) {
size_t axis_index1 = axis1_->findAxisIndex(axis_value1);
float x1 = axis_value1;
float y00 = value(axis_index1, 0);
float x1l = axis1_->axisValue(axis_index1);
float x1u = axis1_->axisValue(axis_index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
float y10 = value(axis_index1 + 1, 0);
float tbl_value
= (1 - dx1) * y00
+ dx1 * y10;
return tbl_value;
}
else {
size_t axis_index1 = axis1_->findAxisIndex(axis_value1);
size_t axis_index2 = axis2_->findAxisIndex(axis_value2);
float x1 = axis_value1;
float x2 = axis_value2;
float y00 = value(axis_index1, axis_index2);
float x1l = axis1_->axisValue(axis_index1);
float x1u = axis1_->axisValue(axis_index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
float y10 = value(axis_index1 + 1, axis_index2);
float y11 = value(axis_index1 + 1, axis_index2 + 1);
float x2l = axis2_->axisValue(axis_index2);
float x2u = axis2_->axisValue(axis_index2 + 1);
float dx2 = (x2 - x2l) / (x2u - x2l);
float y01 = value(axis_index1, axis_index2 + 1);
float tbl_value
= (1 - dx1) * (1 - dx2) * y00
+ dx1 * (1 - dx2) * y10
+ dx1 * dx2 * y11
+ (1 - dx1) * dx2 * y01;
return tbl_value;
}
}
string
Table2::reportValue(const char *result_name,
const LibertyCell *cell,
const Pvt *,
float value1,
const char *comment1,
float value2,
float value3,
const Unit *table_unit,
int digits) const
{
const Units *units = cell->libertyLibrary()->units();
const Unit *unit1 = axis1_->unit(units);
const Unit *unit2 = axis2_->unit(units);
string result = "------- ";
result += axis1_->variableString(),
result += " = ";
result += unit1->asString(value1, digits);
if (comment1)
result += comment1;
result += '\n';
result += "| ";
result += axis2_->variableString();
result += " = ";
result += unit2->asString(value2, digits);
result += '\n';
size_t index1 = axis1_->findAxisIndex(value1);
size_t index2 = axis2_->findAxisIndex(value2);
result += "| ";
result += unit2->asString(axis2_->axisValue(index2), digits);
if (axis2_->size() != 1) {
result += " ";
result += unit2->asString(axis2_->axisValue(index2 + 1), digits);
}
result += '\n';
result += "v --------------------\n";
result += unit1->asString(axis1_->axisValue(index1), digits);
result += " | ";
result += table_unit->asString(value(index1, index2), digits);
if (axis2_->size() != 1) {
result += " ";
result += table_unit->asString(value(index1, index2 + 1), digits);
}
result += '\n';
if (axis1_->size() != 1) {
result += unit1->asString(axis1_->axisValue(index1 + 1), digits);
result += " | ";
result += table_unit->asString(value(index1 + 1, index2), digits);
if (axis2_->size() != 1) {
result += " ";
result +=table_unit->asString(value(index1 + 1, index2 + 1),digits);
}
}
result += '\n';
result += result_name;
result += " = ";
result += table_unit->asString(findValue(value1, value2, value3), digits);
result += '\n';
return result;
}
void
Table2::report(const Units *units,
Report *report) const
{
int digits = 4;
const Unit *table_unit = units->timeUnit();
const Unit *unit1 = axis1_->unit(units);
const Unit *unit2 = axis2_->unit(units);
report->reportLine("%s", tableVariableString(axis2_->variable()));
report->reportLine(" ------------------------------");
string line = " ";
for (size_t index2 = 0; index2 < axis2_->size(); index2++) {
line += unit2->asString(axis2_->axisValue(index2), digits);
line += " ";
}
report->reportLineString(line);
for (size_t index1 = 0; index1 < axis1_->size(); index1++) {
line = unit1->asString(axis1_->axisValue(index1), digits);
line += " |";
for (size_t index2 = 0; index2 < axis2_->size(); index2++) {
line += table_unit->asString(value(index1, index2), digits);
line += " ";
}
report->reportLineString(line);
}
}
////////////////////////////////////////////////////////////////
Table3::Table3(FloatTable *values,
TableAxisPtr axis1,
TableAxisPtr axis2,
TableAxisPtr axis3) :
Table2(values, axis1, axis2),
axis3_(axis3)
{
}
float
Table3::value(size_t axis_index1,
size_t axis_index2,
size_t axis_index3) const
{
size_t row = axis_index1 * axis2_->size() + axis_index2;
return values_->operator[](row)->operator[](axis_index3);
}
// Bilinear Interpolation.
float
Table3::findValue(float axis_value1,
float axis_value2,
float axis_value3) const
{
size_t axis_index1 = axis1_->findAxisIndex(axis_value1);
size_t axis_index2 = axis2_->findAxisIndex(axis_value2);
size_t axis_index3 = axis3_->findAxisIndex(axis_value3);
float x1 = axis_value1;
float x2 = axis_value2;
float x3 = axis_value3;
float dx1 = 0.0;
float dx2 = 0.0;
float dx3 = 0.0;
float y000 = value(axis_index1, axis_index2, axis_index3);
float y001 = 0.0;
float y010 = 0.0;
float y011 = 0.0;
float y100 = 0.0;
float y101 = 0.0;
float y110 = 0.0;
float y111 = 0.0;
if (axis1_->size() != 1) {
float x1l = axis1_->axisValue(axis_index1);
float x1u = axis1_->axisValue(axis_index1 + 1);
dx1 = (x1 - x1l) / (x1u - x1l);
y100 = value(axis_index1 + 1, axis_index2, axis_index3);
if (axis3_->size() != 1)
y101 = value(axis_index1 + 1, axis_index2, axis_index3 + 1);
if (axis2_->size() != 1) {
y110 = value(axis_index1 + 1, axis_index2 + 1, axis_index3);
if (axis3_->size() != 1)
y111 = value(axis_index1 + 1, axis_index2 + 1, axis_index3 + 1);
}
}
if (axis2_->size() != 1) {
float x2l = axis2_->axisValue(axis_index2);
float x2u = axis2_->axisValue(axis_index2 + 1);
dx2 = (x2 - x2l) / (x2u - x2l);
y010 = value(axis_index1, axis_index2 + 1, axis_index3);
if (axis3_->size() != 1)
y011 = value(axis_index1, axis_index2 + 1, axis_index3 + 1);
}
if (axis3_->size() != 1) {
float x3l = axis3_->axisValue(axis_index3);
float x3u = axis3_->axisValue(axis_index3 + 1);
dx3 = (x3 - x3l) / (x3u - x3l);
y001 = value(axis_index1, axis_index2, axis_index3 + 1);
}
float tbl_value
= (1 - dx1) * (1 - dx2) * (1 - dx3) * y000
+ (1 - dx1) * (1 - dx2) * dx3 * y001
+ (1 - dx1) * dx2 * (1 - dx3) * y010
+ (1 - dx1) * dx2 * dx3 * y011
+ dx1 * (1 - dx2) * (1 - dx3) * y100
+ dx1 * (1 - dx2) * dx3 * y101
+ dx1 * dx2 * (1 - dx3) * y110
+ dx1 * dx2 * dx3 * y111;
return tbl_value;
}
// Sample output.
//
// --------- input_net_transition = 0.00
// | ---- total_output_net_capacitance = 0.20
// | | related_out_total_output_net_capacitance = 0.10
// | | 0.00 0.30
// v | --------------------
// 0.01 v / 0.23 0.25
// 0.00 0.20 | 0.10 0.20
// |/ 0.30 0.32
// 0.40 | 0.20 0.30
string
Table3::reportValue(const char *result_name,
const LibertyCell *cell,
const Pvt *,
float value1,
const char *comment1,
float value2,
float value3,
const Unit *table_unit,
int digits) const
{
const Units *units = cell->libertyLibrary()->units();
const Unit *unit1 = axis1_->unit(units);
const Unit *unit2 = axis2_->unit(units);
const Unit *unit3 = axis3_->unit(units);
string result = " --------- ";
result += axis1_->variableString(),
result += " = ";
result += unit1->asString(value1, digits);
if (comment1)
result += comment1;
result += '\n';
result += " | ---- ";
result += axis2_->variableString(),
result += " = ";
result += unit2->asString(value2, digits);
result += '\n';
result += " | | ";
result += axis3_->variableString();
result += " = ";
result += unit3->asString(value3, digits);
result += '\n';
size_t axis_index1 = axis1_->findAxisIndex(value1);
size_t axis_index2 = axis2_->findAxisIndex(value2);
size_t axis_index3 = axis3_->findAxisIndex(value3);
result += " | | ";
result += unit3->asString(axis3_->axisValue(axis_index3), digits);
if (axis3_->size() != 1) {
result += " ";
result += unit3->asString(axis3_->axisValue(axis_index3 + 1), digits);
}
result += '\n';
result += " v | --------------------\n";
if (axis1_->size() != 1) {
result += " ";
result += unit1->asString(axis1_->axisValue(axis_index1+1), digits);
result += " v / ";
result += table_unit->asString(value(axis_index1+1,axis_index2,axis_index3),
digits);
if (axis3_->size() != 1) {
result += " ";
result += table_unit->asString(value(axis_index1+1,axis_index2,axis_index3+1),
digits);
}
}
else {
appendSpaces(result, digits+3);
result += " v / ";
}
result += '\n';
result += unit1->asString(axis1_->axisValue(axis_index1), digits);
result += " ";
result += unit2->asString(axis2_->axisValue(axis_index2), digits);
result += " | ";
result += table_unit->asString(value(axis_index1, axis_index2, axis_index3), digits);
if (axis3_->size() != 1) {
result += " ";
result += table_unit->asString(value(axis_index1, axis_index2, axis_index3+1),
digits);
}
result += '\n';
result += " |/ ";
if (axis1_->size() != 1
&& axis2_->size() != 1) {
result += table_unit->asString(value(axis_index1+1,axis_index2+1,axis_index3),
digits);
if (axis3_->size() != 1) {
result += " ";
result +=table_unit->asString(value(axis_index1+1,axis_index2+1,axis_index3+1),
digits);
}
}
result += '\n';
result += " ";
result += unit2->asString(axis2_->axisValue(axis_index2 + 1), digits);
result += " | ";
if (axis2_->size() != 1) {
result += table_unit->asString(value(axis_index1, axis_index2+1, axis_index3),
digits);
if (axis3_->size() != 1) {
result += " ";
result +=table_unit->asString(value(axis_index1, axis_index2+1,axis_index3+1),
digits);
}
}
result += '\n';
result += result_name;
result += " = ";
result += table_unit->asString(findValue(value1, value2, value3), digits);
result += '\n';
return result;
}
static void
appendSpaces(string &result,
int count)
{
while (count--)
result += ' ';
}
void
Table3::report(const Units *units,
Report *report) const
{
int digits = 4;
const Unit *table_unit = units->timeUnit();
const Unit *unit1 = axis1_->unit(units);
const Unit *unit2 = axis2_->unit(units);
const Unit *unit3 = axis3_->unit(units);
for (size_t axis_index1 = 0; axis_index1 < axis1_->size(); axis_index1++) {
report->reportLine("%s %s", tableVariableString(axis1_->variable()),
unit1->asString(axis1_->axisValue(axis_index1), digits));
report->reportLine("%s", tableVariableString(axis3_->variable()));
report->reportLine(" ------------------------------");
string line = " ";
for (size_t axis_index3 = 0; axis_index3 < axis3_->size(); axis_index3++) {
line += unit3->asString(axis3_->axisValue(axis_index3), digits);
line += " ";
}
report->reportLineString(line);
for (size_t axis_index2 = 0; axis_index2 < axis2_->size(); axis_index2++) {
line = unit2->asString(axis2_->axisValue(axis_index2),digits);
line += " |";
for (size_t axis_index3 = 0; axis_index3 < axis3_->size(); axis_index3++) {
line += table_unit->asString(value(axis_index1, axis_index2, axis_index3),digits);
line += " ";
}
report->reportLineString(line);
}
}
}
////////////////////////////////////////////////////////////////
TableAxis::TableAxis(TableAxisVariable variable,
FloatSeq *values) :
variable_(variable),
values_(values)
{
}
TableAxis::~TableAxis()
{
delete values_;
}
bool
TableAxis::inBounds(float value) const
{
size_t size = values_->size();
return size > 1
&& value >= (*values_)[0]
&& value <= (*values_)[size - 1];
}
// Bisection search.
size_t
TableAxis::findAxisIndex(float value) const
{
size_t size = values_->size();
if (size <= 1 || value <= (*values_)[0])
return 0;
else if (value >= (*values_)[size - 1])
// Return max_index-1 for value too large so interpolation pts are index,index+1.
return size - 2;
else {
int lower = -1;
int upper = size;
while (upper - lower > 1) {
int mid = (upper + lower) >> 1;
if (value >= (*values_)[mid])
lower = mid;
else
upper = mid;
}
return lower;
}
}
void
TableAxis::findAxisIndex(float value,
// Return values.
size_t &index,
bool &exists) const
{
size_t size = values_->size();
if (size != 0
&& value >= (*values_)[0]
&& value <= (*values_)[size - 1]) {
int lower = -1;
int upper = size;
while (upper - lower > 1) {
int mid = (upper + lower) >> 1;
if (value == (*values_)[mid]) {
index = mid;
exists = true;
return;
}
if (value > (*values_)[mid])
lower = mid;
else
upper = mid;
}
}
exists = false;
}
const char *
TableAxis::variableString() const
{
return tableVariableString(variable_);
}
const Unit *
TableAxis::unit(const Units *units)
{
return tableVariableUnit(variable_, units);
}
////////////////////////////////////////////////////////////////
static EnumNameMap<TableAxisVariable> table_axis_variable_map =
{{TableAxisVariable::total_output_net_capacitance, "total_output_net_capacitance"},
{TableAxisVariable::equal_or_opposite_output_net_capacitance, "equal_or_opposite_output_net_capacitance"},
{TableAxisVariable::input_net_transition, "input_net_transition"},
{TableAxisVariable::input_transition_time, "input_transition_time"},
{TableAxisVariable::related_pin_transition, "related_pin_transition"},
{TableAxisVariable::constrained_pin_transition, "constrained_pin_transition"},
{TableAxisVariable::output_pin_transition, "output_pin_transition"},
{TableAxisVariable::connect_delay, "connect_delay"},
{TableAxisVariable::related_out_total_output_net_capacitance, "related_out_total_output_net_capacitance"},
{TableAxisVariable::time, "time"},
{TableAxisVariable::iv_output_voltage, "iv_output_voltage"},
{TableAxisVariable::input_noise_width, "input_noise_width"},
{TableAxisVariable::input_noise_height, "input_noise_height"},
{TableAxisVariable::input_voltage, "input_voltage"},
{TableAxisVariable::output_voltage, "output_voltage"},
{TableAxisVariable::path_depth, "path_depth"},
{TableAxisVariable::path_distance, "path_distance"},
{TableAxisVariable::normalized_voltage, "normalized_voltage"}
};
TableAxisVariable
stringTableAxisVariable(const char *variable)
{
return table_axis_variable_map.find(variable, TableAxisVariable::unknown);
}
const char *
tableVariableString(TableAxisVariable variable)
{
return table_axis_variable_map.find(variable);
}
const Unit *
tableVariableUnit(TableAxisVariable variable,
const Units *units)
{
switch (variable) {
case TableAxisVariable::total_output_net_capacitance:
case TableAxisVariable::related_out_total_output_net_capacitance:
case TableAxisVariable::equal_or_opposite_output_net_capacitance:
return units->capacitanceUnit();
case TableAxisVariable::input_net_transition:
case TableAxisVariable::input_transition_time:
case TableAxisVariable::related_pin_transition:
case TableAxisVariable::constrained_pin_transition:
case TableAxisVariable::output_pin_transition:
case TableAxisVariable::connect_delay:
case TableAxisVariable::time:
case TableAxisVariable::input_noise_height:
return units->timeUnit();
case TableAxisVariable::input_voltage:
case TableAxisVariable::output_voltage:
case TableAxisVariable::iv_output_voltage:
case TableAxisVariable::input_noise_width:
return units->voltageUnit();
case TableAxisVariable::path_distance:
return units->distanceUnit();
case TableAxisVariable::path_depth:
case TableAxisVariable::normalized_voltage:
case TableAxisVariable::unknown:
return units->scalarUnit();
}
// Prevent warnings from lame compilers.
return nullptr;
}
////////////////////////////////////////////////////////////////
OutputWaveforms::OutputWaveforms(TableAxisPtr slew_axis,
TableAxisPtr cap_axis,
const RiseFall *rf,
Table1Seq &current_waveforms,
Table1 *ref_times) :
slew_axis_(slew_axis),
cap_axis_(cap_axis),
rf_(rf),
current_waveforms_(current_waveforms),
voltage_currents_(current_waveforms.size()),
voltage_times_(current_waveforms.size()),
ref_times_(ref_times),
vdd_(0.0)
{
}
OutputWaveforms::~OutputWaveforms()
{
current_waveforms_.deleteContents();
voltage_currents_.deleteContents();
voltage_times_.deleteContents();
delete ref_times_;
}
bool
OutputWaveforms::checkAxes(const TableTemplate *tbl_template)
{
const TableAxis *axis1 = tbl_template->axis1();
const TableAxis *axis2 = tbl_template->axis2();
const TableAxis *axis3 = tbl_template->axis3();
return (axis1 && axis1->variable() == TableAxisVariable::input_net_transition
&& axis2->variable() == TableAxisVariable::time
&& axis3 == nullptr)
|| (axis1 && axis1->variable() == TableAxisVariable::input_net_transition
&& axis2 && axis2->variable() == TableAxisVariable::total_output_net_capacitance
&& axis3->variable() == TableAxisVariable::time)
|| (axis1 && axis1->variable() == TableAxisVariable::total_output_net_capacitance
&& axis2 && axis2->variable() == TableAxisVariable::input_net_transition
&& axis3->variable() == TableAxisVariable::time);
}
const Table1 *
OutputWaveforms::currentWaveform(float slew,
float cap)
{
size_t slew_index = slew_axis_->findAxisIndex(slew);
size_t cap_index = cap_axis_->findAxisIndex(cap);
size_t wave_index = slew_index * cap_axis_->size() + cap_index;
return current_waveforms_[wave_index];
}
float
OutputWaveforms::timeCurrent(float slew,
float cap,
float time)
{
size_t slew_index = slew_axis_->findAxisIndex(slew);
size_t cap_index = cap_axis_->findAxisIndex(cap);
size_t cap_count = cap_axis_->size();
size_t wave_index00 = slew_index * cap_count + cap_index;
size_t wave_index01 = slew_index * cap_count + (cap_index + 1);
size_t wave_index10 = (slew_index + 1) * cap_count + cap_index;
size_t wave_index11 = (slew_index + 1) * cap_count + (cap_index + 1);
const Table1 *waveform00 = current_waveforms_[wave_index00];
const Table1 *waveform01 = current_waveforms_[wave_index01];
const Table1 *waveform10 = current_waveforms_[wave_index10];
const Table1 *waveform11 = current_waveforms_[wave_index11];
// Interpolate waveform samples at voltage steps.
size_t index1 = slew_index;
size_t index2 = cap_index;
float x1 = slew;
float x2 = cap;
float x1l = slew_axis_->axisValue(index1);
float x1u = slew_axis_->axisValue(index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
float x2l = cap_axis_->axisValue(index2);
float x2u = cap_axis_->axisValue(index2 + 1);
float dx2 = (x2 - x2l) / (x2u - x2l);
float y00 = waveform00->findValueClipZero(time);
float y01 = waveform01->findValueClipZero(time);
float y10 = waveform10->findValueClipZero(time);
float y11 = waveform11->findValueClipZero(time);
float current
= (1 - dx1) * (1 - dx2) * y00
+ dx1 * (1 - dx2) * y10
+ dx1 * dx2 * y11
+ (1 - dx1) * dx2 * y01;
return current;
}
float
OutputWaveforms::referenceTime(float slew)
{
return ref_times_->findValue(slew);
}
void
OutputWaveforms::setVdd(float vdd)
{
vdd_ = vdd;
}
Table1
OutputWaveforms::voltageWaveform(float slew,
float cap)
{
float volt_step = vdd_ / voltage_waveform_step_count_;
FloatSeq *times = new FloatSeq;
FloatSeq *volts = new FloatSeq;
for (size_t v = 0; v <= voltage_waveform_step_count_; v++) {
float volt = v * volt_step;
float time = voltageTime(slew, cap, volt);
times->push_back(time);
volts->push_back(volt);
}
TableAxisPtr time_axis = make_shared<TableAxis>(TableAxisVariable::time, times);
return Table1(volts, time_axis);
}
float
OutputWaveforms::voltageTime(float slew,
float cap,
float volt)
{
size_t slew_index = slew_axis_->findAxisIndex(slew);
size_t cap_index = cap_axis_->findAxisIndex(cap);
size_t cap_count = cap_axis_->size();
size_t wave_index00 = slew_index * cap_count + cap_index;
size_t wave_index01 = slew_index * cap_count + (cap_index + 1);
size_t wave_index10 = (slew_index + 1) * cap_count + cap_index;
size_t wave_index11 = (slew_index + 1) * cap_count + (cap_index + 1);
float cap0 = cap_axis_->axisValue(cap_index);
float cap1 = cap_axis_->axisValue(cap_index + 1);
// Interpolate waveform samples at voltage steps.
size_t index1 = slew_index;
size_t index2 = cap_index;
float x1 = slew;
float x2 = cap;
float x1l = slew_axis_->axisValue(index1);
float x1u = slew_axis_->axisValue(index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
float x2l = cap_axis_->axisValue(index2);
float x2u = cap_axis_->axisValue(index2 + 1);
float dx2 = (x2 - x2l) / (x2u - x2l);
float y00 = voltageTime1(volt, wave_index00, cap0);
float y01 = voltageTime1(volt, wave_index01, cap1);
float y10 = voltageTime1(volt, wave_index10, cap0);
float y11 = voltageTime1(volt, wave_index11, cap1);
float time
= (1 - dx1) * (1 - dx2) * y00
+ dx1 * (1 - dx2) * y10
+ dx1 * dx2 * y11
+ (1 - dx1) * dx2 * y01;
return time;
}
float
OutputWaveforms::voltageTime1(float voltage,
size_t wave_index,
float cap)
{
FloatSeq *voltage_times = voltageTimes(wave_index, cap);
float volt_step = vdd_ / voltage_waveform_step_count_;
size_t volt_idx = voltage / volt_step;
float time0 = (*voltage_times)[volt_idx];
float time1 = (*voltage_times)[volt_idx + 1];
float time = time0 + (time1 - time0) * (voltage - volt_step * volt_idx);
return time;
}
FloatSeq *
OutputWaveforms::voltageTimes(size_t wave_index,
float cap)
{
FloatSeq *voltage_times = voltage_times_[wave_index];
if (voltage_times == nullptr) {
findVoltages(wave_index, cap);
voltage_times = voltage_times_[wave_index];
}
return voltage_times;
}
void
OutputWaveforms::findVoltages(size_t wave_index,
float cap)
{
if (vdd_ == 0.0)
criticalError(239, "output waveform vdd = 0.0");
// Integrate current waveform to find voltage waveform.
// i = C dv/dt
FloatSeq volts;
Table1 *currents = current_waveforms_[wave_index];
const TableAxis *time_axis = currents->axis1();
float prev_time = time_axis->axisValue(0);
float prev_current = currents->value(0);
float voltage = 0.0;
volts.push_back(voltage);
bool always_rise = true;
bool invert = (always_rise && rf_ == RiseFall::fall());
for (size_t i = 1; i < time_axis->size(); i++) {
float time = time_axis->axisValue(i);
float current = currents->value(i);
float dv = (current + prev_current) / 2.0 * (time - prev_time) / cap;
voltage += invert ? -dv : dv;
volts.push_back(voltage);
prev_time = time;
prev_current = current;
}
// Make voltage -> current table.
FloatSeq *axis_volts = new FloatSeq(volts);
TableAxisPtr volt_axis =
make_shared<TableAxis>(TableAxisVariable::input_voltage, axis_volts);
FloatSeq *currents1 = new FloatSeq(*currents->values());
Table1 *volt_currents = new Table1(currents1, volt_axis);
voltage_currents_[wave_index] = volt_currents;
// Sample the voltage waveform at uniform intervals to speed up
// voltage time lookup.
FloatSeq *voltage_times = new FloatSeq;
float volt_step = vdd_ / voltage_waveform_step_count_;
size_t i = 0;
float time0 = time_axis->axisValue(i);
float volt0 = volts[i];
i = 1;
float time1 = time_axis->axisValue(i);
float volt1 = volts[i];
for (size_t v = 0; v <= voltage_waveform_step_count_; v++) {
float volt3 = v * volt_step;
while (volt3 > volt1 && i < volts.size() - 1) {
time0 = time1;
volt0 = volt1;
i++;
time1 = time_axis->axisValue(i);
volt1 = volts[i];
}
float time3 = time0 + (time1 - time0) * (volt3 - volt0) / (volt1 - volt0);
voltage_times->push_back(time3);
}
voltage_times_[wave_index] = voltage_times;
}
float
OutputWaveforms::voltageCurrent(float slew,
float cap,
float volt)
{
size_t slew_index = slew_axis_->findAxisIndex(slew);
size_t cap_index = cap_axis_->findAxisIndex(cap);
size_t cap_count = cap_axis_->size();
size_t wave_index00 = slew_index * cap_count + cap_index;
size_t wave_index01 = slew_index * cap_count + (cap_index + 1);
size_t wave_index10 = (slew_index + 1) * cap_count + cap_index;
size_t wave_index11 = (slew_index + 1) * cap_count + (cap_index + 1);
float cap0 = cap_axis_->axisValue(cap_index);
float cap1 = cap_axis_->axisValue(cap_index + 1);
// Interpolate waveform samples at voltage steps.
size_t index1 = slew_index;
size_t index2 = cap_index;
float x1 = slew;
float x2 = cap;
float x1l = slew_axis_->axisValue(index1);
float x1u = slew_axis_->axisValue(index1 + 1);
float dx1 = (x1 - x1l) / (x1u - x1l);
float x2l = cap_axis_->axisValue(index2);
float x2u = cap_axis_->axisValue(index2 + 1);
float dx2 = (x2 - x2l) / (x2u - x2l);
const Table1 *waveform00 = voltageCurrents(wave_index00, cap0);
const Table1 *waveform01 = voltageCurrents(wave_index01, cap1);
const Table1 *waveform10 = voltageCurrents(wave_index10, cap0);
const Table1 *waveform11 = voltageCurrents(wave_index11, cap1);
float y00 = waveform00->findValueClipZero(volt);
float y01 = waveform01->findValueClipZero(volt);
float y10 = waveform10->findValueClipZero(volt);
float y11 = waveform11->findValueClipZero(volt);
float current
= (1 - dx1) * (1 - dx2) * y00
+ dx1 * (1 - dx2) * y10
+ dx1 * dx2 * y11
+ (1 - dx1) * dx2 * y01;
return current;
}
const Table1 *
OutputWaveforms::voltageCurrents(size_t wave_index,
float cap)
{
const Table1 *waveform = voltage_currents_[wave_index];
if (waveform == nullptr) {
findVoltages(wave_index, cap);
waveform = voltage_currents_[wave_index];
}
return waveform;
}
////////////////////////////////////////////////////////////////
DriverWaveform::DriverWaveform(const char *name,
TablePtr waveforms) :
name_(name),
waveforms_(waveforms)
{
}
DriverWaveform::~DriverWaveform()
{
stringDelete(name_);
}
Table1
DriverWaveform::waveform(float slew)
{
const TableAxis *volt_axis = waveforms_->axis2();
FloatSeq *time_values = new FloatSeq;
FloatSeq *volt_values = new FloatSeq;
for (float volt : *volt_axis->values()) {
float time = waveforms_->findValue(slew, volt, 0.0);
time_values->push_back(time);
volt_values->push_back(volt);
}
TableAxisPtr time_axis = make_shared<TableAxis>(TableAxisVariable::time,
time_values);
Table1 waveform(volt_values, time_axis);
return waveform;
}
} // namespace
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