Date: Mon May 30 2011 - 22:05:33 PDT
C. K.,
R_pin, L_pin, C_pin are for modeling the package of a
chip on a pin per pin bases. These values override the
package R, L, C values in the [Package] keyword, because
these provide more accuracy. But these are still just a
lumped, uncoupled RLC model which is not very useful for
today’s very high frequencies.
You don’t have to “make use” of these values, the simulator
(hopefully) has support to include them in your simulation
for you. If not, you can read these values and write a
circuit manually into your simulation netlist.
Series models in IBIS allow you to connect various circuit
elements between two die-pads. These are called series
as opposed to buffers which are not “through” models.
I would recommend that you should look at the IBIS Cookbook
http://www.eda.org/ibis/cookbook/cookbook-v4.pdf which should
give you a lot of answers to questions like this.
Arpad
===============================================================
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Chee.Kiang.Chua@continental-corporation.com
Sent: Monday, May 30, 2011 11:54 PM
To: ibis-users
Subject: [IBIS-Users] Requesting for some help / information regarding the use of IBIS in SI simulation.
Hello,
A very good morning to everyone!
My name is C.k.Chua.
I am writing to request for some help / information regarding the use of IBIS in SI simulation.
I am relatively new to IBIS. While using IBIS models for SI simulation, I come across some “features” in the IBIS file that I do not know how I can make use of the information. Please help me with the following queries that I have:
(1) I wish to perform SI simulation on the differential signal but there are no models assigned to the pins. Instead the values for R_pin, L_pin and C_pin are given. (as below)
Query:
(1-1) Can I make use of the values of R_pin, L_pin and C_pin given to perform SI simulation?
(1-2) How do I make use of the values of R_pin, L_pin and C_pin given to perform SI simulation?
(2) While trying to import models, I come across “series model” (as below)
Query:
(2-1) May I know what is Series Model and how do I make use of series model.
MANY THANKS in advance and appreciate your time for reading my mail.
Best Wishes and Have a Nice Day Ahead!
C.K.Chua
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