ECSM characterization

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viviadam

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What does ECSM capacitance mean? Why do we set separate threshold point when determining the ECSM capacitance at pin level and timing level?
The format for pin level is:
Code:
Pin A
{
    ...
    ...
    ecsm capacitance (rise) {
    threshold_pct =50.0
     index1=(...)
     values=(...) 
     }
     ...
     ...
}

for timing arc level:
    //
    ....
    rise_transition()
     {
           waveform_1 {}
           waveform_'n'  {}
           ecsm_capacitance (rise)
           {
               threshold_pct = 50.0
               ...
              }     
           ecsm_capacitance (rise)
           {
               threshold_pct = 70.0
               ...
              }     
          }
What does threshold_pct mean and why we set seperate threshold points to sweep the capacitances?
Thank you,
 
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