ccs table model

Signed-off-by: James Cherry <[email protected]>

include/sta/TableModel.hh

@@ -507,21 +507,20 @@ public:
   const RiseFall *rf() const { return rf_; }
   Table1 voltageWaveform(float in_slew,
                          float load_cap);
-  float timeToVoltage(float in_slew,
-                      float load_cap,
-                      float voltage);
+  float voltageTime(float in_slew,
+                    float load_cap,
+                    float voltage);
   const Table1 *currentWaveform(float slew,
                                 float cap);
   float referenceTime(float slew);
   static bool checkAxes(TableTemplate *tbl_template);
 
 private:
-  float timeToVoltage(const Table1 *waveform,
-                      float voltage);
-  size_t findValueIndex(const Table1 *table,
-                        float value);
-  Table1 *voltageWaveform(size_t wave_index,
-                          float cap);
+  float voltageTime1(float voltage,
+                     size_t wave_index,
+                     float cap);
+  FloatSeq *voltageTimes(size_t wave_index,
+                         float cap);
 
   // Row.
   TableAxisPtr slew_axis_;
@@ -529,8 +528,10 @@ private:
   TableAxisPtr cap_axis_;
   const RiseFall *rf_;
   Table1Seq current_waveforms_;
-  Table1Seq voltage_waveforms_;
+  FloatTable voltage_times_;
   Table1 *ref_times_;
+  float voltage_max_;
+  static constexpr size_t voltage_waveform_step_count_ = 20;
 };
 
 class DriverWaveform