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dmp ceff Rd Vth factor

This commit is contained in:
James Cherry 2020-11-08 12:44:00 -07:00
parent a56fa7f428
commit a4df141cbc
2 changed files with 9 additions and 4 deletions
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12
dcalc/DmpCeff.cc
View File

@ -81,6 +81,7 @@ private:
static double static double
gateModelRd(const LibertyCell *cell, gateModelRd(const LibertyCell *cell,
GateTableModel *gate_model, GateTableModel *gate_model,
const RiseFall *rf,
double in_slew, double in_slew,
double c2, double c2,
double c1, double c1,
@ -1571,7 +1572,7 @@ DmpCeffDelayCalc::gateDelay(const LibertyCell *drvr_cell,
float c2, rpi, c1; float c2, rpi, c1;
parasitics_->piModel(drvr_parasitic, c2, rpi, c1); parasitics_->piModel(drvr_parasitic, c2, rpi, c1);
setCeffAlgorithm(drvr_library_, drvr_cell, pvt, table_model, setCeffAlgorithm(drvr_library_, drvr_cell, pvt, table_model,
in_slew1, related_out_cap, drvr_rf_, in_slew1, related_out_cap,
c2, rpi, c1); c2, rpi, c1);
double dmp_gate_delay, dmp_drvr_slew; double dmp_gate_delay, dmp_drvr_slew;
gateDelaySlew(dmp_gate_delay, dmp_drvr_slew); gateDelaySlew(dmp_gate_delay, dmp_drvr_slew);
@ -1598,6 +1599,7 @@ DmpCeffDelayCalc::setCeffAlgorithm(const LibertyLibrary *drvr_library,
const LibertyCell *drvr_cell, const LibertyCell *drvr_cell,
const Pvt *pvt, const Pvt *pvt,
GateTableModel *gate_model, GateTableModel *gate_model,
const RiseFall *rf,
double in_slew, double in_slew,
float related_out_cap, float related_out_cap,
double c2, double c2,
@ -1606,7 +1608,7 @@ DmpCeffDelayCalc::setCeffAlgorithm(const LibertyLibrary *drvr_library,
{ {
double rd = 0.0; double rd = 0.0;
if (gate_model) { if (gate_model) {
rd = gateModelRd(drvr_cell, gate_model, in_slew, c2, c1, rd = gateModelRd(drvr_cell, gate_model, rf, in_slew, c2, c1,
related_out_cap, pvt, pocv_enabled_); related_out_cap, pvt, pocv_enabled_);
// Zero Rd means the table is constant and thus independent of load cap. // Zero Rd means the table is constant and thus independent of load cap.
if (rd < 1e-2 if (rd < 1e-2
@ -1706,6 +1708,7 @@ DmpCeffDelayCalc::reportGateDelay(const LibertyCell *drvr_cell,
static double static double
gateModelRd(const LibertyCell *cell, gateModelRd(const LibertyCell *cell,
GateTableModel *gate_model, GateTableModel *gate_model,
const RiseFall *rf,
double in_slew, double in_slew,
double c2, double c2,
double c1, double c1,
@ -1713,7 +1716,7 @@ gateModelRd(const LibertyCell *cell,
const Pvt *pvt, const Pvt *pvt,
bool pocv_enabled) bool pocv_enabled)
{ {
float cap1 = (c1 + c2) * .75; float cap1 = c1 + c2;
float cap2 = cap1 + 1e-15; float cap2 = cap1 + 1e-15;
ArcDelay d1, d2; ArcDelay d1, d2;
Slew s1, s2; Slew s1, s2;
@ -1721,7 +1724,8 @@ gateModelRd(const LibertyCell *cell,
d1, s1); d1, s1);
gate_model->gateDelay(cell, pvt, in_slew, cap2, related_out_cap, pocv_enabled, gate_model->gateDelay(cell, pvt, in_slew, cap2, related_out_cap, pocv_enabled,
d2, s2); d2, s2);
float rd = abs(delayAsFloat(d1) - delayAsFloat(d2)) / (cap2 - cap1); double vth = cell->libertyLibrary()->outputThreshold(rf);
float rd = -log(vth) * abs(delayAsFloat(d1) - delayAsFloat(d2)) / (cap2 - cap1);
return rd; return rd;
} }

1
dcalc/DmpCeff.hh
View File

@ -82,6 +82,7 @@ protected:
const LibertyCell *cell, const LibertyCell *cell,
const Pvt *pvt, const Pvt *pvt,
GateTableModel *gate_model, GateTableModel *gate_model,
const RiseFall *rf,
double in_slew, double in_slew,
float related_out_cap, float related_out_cap,
double c2, double c2,