RE: [IBIS-Users] IBIS AMI analog channel

Hi Eric,

The analog channel is considered to be the Tx back end, the serial
channel and the Rx front end. Not all of these can be defined by the
IBIS model, but certainly a part of it can be.  The other parts can be
defined by S parameters, transistor level models or macro-models. 

About the question as to why the AMI model is embedded inside the IBIS
model - the idea was to extend the capacity of the IBIS model to include
SERDES devices that are a part of the Tx and Rx.

 

Hope that answers your questions,

Regards,

Ambrish.

 

Cadence Design Systems, Inc.

 

________________________________

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Eric Monteiro
Sent: Tuesday, September 22, 2009 9:54 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] IBIS AMI analog channel

 

Hello

 

Upon reviewing the following presentation:

http://www.eda.org/ibis/summits/jul09/katz1.pdf
<http://www.eda.org/ibis/summits/jul09/katz1.pdf>  pages 3 through 6

 

Where the impulse respone is measured remains unlear. 

 

1) I assume the ideal pulse is forced at the input of the Tx and the
output is measured after the analog front end of the Rx (i.e. the input
to the CDR).

 

So my question is, where have other model developers forced the impulse
(input or output of Tx), and measured the impulse reponse (input or
output of Rx) that is then passed to AMI_Init?

 

2) If the pulse is indeed forced at the input of the Tx, and meausred at
the output of the Rx (right before the CDR) does that not mean that AMI
is NOT compatible with current IBIS models since you can't measure an
output from an Rx input buffer?  In which case, AMI should just be its
own standalone standard not imbeded within an IBIS model (like ICM),
shouldn't it?

 

Regards,

Eric

 

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