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dcalc load slew default

This commit is contained in:
James Cherry 2020-11-04 14:01:22 -08:00
parent 4c3e0ec1bd
commit 6136412cb3
1 changed files with 1 additions and 10 deletions
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11
dcalc/DmpCeff.cc
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@ -268,7 +268,6 @@ protected:
// Load rspf elmore delay.
double elmore_;
double p3_;
double elmore_slew_factor_;
private:
virtual double dvl0dt(double t) = 0;
@ -336,8 +335,6 @@ DmpAlg::init(const LibertyLibrary *drvr_library,
vl_ = drvr_library->slewLowerThreshold(rf);
vh_ = drvr_library->slewUpperThreshold(rf);
slew_derate_ = drvr_library->slewDerateFromLibrary();
elmore_slew_factor_ = log(vh_) - log(vl_);
}
// Find Ceff, delta_t and t0 for the driver.
@ -564,9 +561,6 @@ DmpAlg::loadDelaySlew(const Pin *,
// Elmore delay is small compared to driver slew.
|| elmore < gate_slew_ * 1e-3) {
delay = elmore;
// solve v=1-exp(-t/rc) for t, elmore_slew_factor_ = t(vh) - t(vl)
// slew = elmore * (log(vh_) - log(vl_))
// slew = elmore * elmore_slew_factor_;
slew = gate_slew_;
}
else {
@ -600,11 +594,8 @@ DmpAlg::loadDelaySlew(const Pin *,
slew = slew1;
}
catch (DmpError &error) {
// Failed - use elmore delay and driver slew.
delay = elmore_;
// solve v=1-exp(-t/rc) for t, elmore_slew_factor_ = t(vh) - t(vl)
// slew = elmore * (log(vh_) - log(vl_))
slew = elmore * elmore_slew_factor_;
slew = gate_slew_;
}
}
}