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This point is a bit confusing because the generic batch simulation wizard also includes the quick analysis features. The Default IC characteristics actually are not used in detailed simulation. Simulations require actual models on all the pins of all the nets involved in the simulation. Default IC characteristics are used only in the formulas for quick analysis crosstalk.
It's important to understand the difference between quick analyis and detailed simulation. Quick analysis never runs the simulator. It uses formulas and reports. When you request a crosstalk report by quick analysis it uses a formula, so it can use the rise or fall time from an assigned model, or just from the default IC characteristic. It uses the rise or fall time from models if they are assigned. If no driver type model is assigned to any pin on a net then quick analysis uses the default IC rise/fall time.
If you want to actually run a simulation of net crosstalk, you need to use the detailed simulation function in the Generic Batch Wizard. This function runs the circuit simulator and requires IBIS models on all pins of all the nets included in each simulation.
You can read more about crosstalk simulation in these SupportNet technotes.
For detailed analysis of crosstalk do we have to assign models net by net or is there any method to assign models in one shot i tried assigning models using .REF & .QPL file but its not working in audit run it is showing driver model missing and if i am assigning it net by net then it working.
if there is any method to assign models in one shot then kindly convey.