Subject: RE: [IBIS-Users] input termination
From: erik.van.der.ven@philips.com
Date: Tue Oct 07 2003 - 05:22:50 PDT
Hello Giovanni,
Yes, I have a Spectre netlist with the termination included. I do not use
s2ibis. I do not understand how you use s2ibis since it is not suitable
for differential signals, and I do not see how it should model the input
termination.
In your second case: do you use the series model type? As far as I
understand from the discussions here it is not implemented in most
simulators.
Can anyone tell if the [series pin mapping] is implemented in simulation
tools?
With kind regards,
Erik
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
giovanni.abril@ngc.com
10/03/03 03:59 PM
To: Erik van der Ven/NYM/SC/PHILIPS@EMEA2
cc:
Subject: RE: [IBIS-Users] input termination
Classification:
Hi Erik,
Do you have a spice netlist with the internal termination included? In
the past I have modeled this two different ways:
In one case I used spice2ibis because I had the internal termination
included.
In the second case I added a series resistor between the two input pins in
my IBIS model.
Both ways worked well.
Let me know if you have any questions,
Gio
-----Original Message-----
From: erik.van.der.ven@philips.com [mailto:erik.van.der.ven@philips.com]
Sent: Friday, October 03, 2003 2:51 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] input termination
Hello IBIS experts,
I have to model an LVDS input with internal termination.
What is the best way to model this internal circuitry?
What are the alternatives?
And are the above implementations suitable for most IBIS simulators?
In an input model Vinl and Vinh can be specified. This does not apply to
my case since the absolute values are not of impotance, only the
differential voltage matters. Is it enough to specify Vdiff in the [diff
pin] keyword? Will Vinl and Vinh be ignored then? (since they also have
default values normally).
With kind regards,
Erik.
Ir. Erik van der Ven
Room DB1032
Business Line Networking Infrastructure
Philips Semiconductors BV
Gerstweg 2
6534 AE Nijmegen
The Netherlands
Phone: +31-24-3534334
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