What is the difference between CCS Vs NLDM Vs ECSM Library delay model

[SK1989]

Hi,

I am quite uncertain about the difference between CCS, NLDM and ECSM. I will really appreciate if anyone can give the information regarding this.

In addition to that, from the layout generation to tapout of design in IC compiler, which model should be used ?


Thanks

Sachin

 

[Torq]

Use the force (google) : Non Linear Delay Model, Synopsys Composite Current Source Model
Comparing NLDM And CCS delay models - Paripath - improving sign-off
CCS mostly used for sign off analysis. It is precise, but too heavyweight library. Not all EDA tools even support it. And not all Fabs offer it for their processes.

 

[SK1989]

Hi,

Thanks for replying. Do you mean if i go for conventional library model (NLDM), will it be fine for sign-off ?

 

[libinpk]

The choice would depend on your process technology.
While the older nodes did just fine with NLDM (90nm+), the newer and smaller process nodes prefer CCS for better accuracy.