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Forums > Silicon-package-board > Signal Integrity and Modeling

Subject: How to change rise and fall time in Stimulus Edit of SigXplorer
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HappySniper
Posts: 3
Online: User is Offline
10/22/2007 12:26 AM  

I'm using SigXplorer of Cadence SPB 15.2 to simulate the signal integrity. After extracting the topology, I need to define the stimulus. In the dialog of 'IO Cell Stimulus Edit', the stimulus could be customized. But the rise time and fall time are fixed(Tr 2.737 ns and Tf 3.357 ns). The question is how to modify them?

Thank you in advance

HappySniper





Donald Telian
Posts: 42
Online: User is Offline
10/23/2007 3:20 PM  
Tr and Tf are derived directly from the "dt" parameter in your model's DML file (or the [Ramp] keyword in the original IBIS) which gives the 20-80% rise/fall times. As such, the values in the form are derived from the equation dt/0.6. Change the dt value, reload the libraries, and you'll see the Tr and Tf values change to whatever you want.

That said, many models/simulations are insensitive to changes in Tr/Tf - but that depends on your application.

Donald
Donald Telian
SI Consultant
telian@sti.net
559-760-5793
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Forums > Silicon-package-board > Signal Integrity and Modeling > How to change rise and fall time in Stimulus Edit of SigXplorer


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