RE: [IBIS-Users] AMI convolution

Eric,
 
My message from yesterday didn't make it through
because I had a screen shot of a presentation in
it, so I am going to refer you to slide 1 of the
following presentation:
 
http://www.vhdl.org/pub/ibis/macromodel_wip/archive/20090921/arpadmurany
i/AMI%20flows:%20IBIS%205.0%20and%202009%20Sept%208,15%20proposals/AMI_F
lows.pdf
 
This flow diagram represents what is described by
the current AMI specification in IBIS v5.0.
 
I know others may have already answered your question,
but hopefully this will also help you in getting a
better understanding of the flow.  Please note that
the IBIS ATM group is working on corrections to this
flow, and the plan is to have the corrected version
in IBIS v5.1 once the BIRD written for it is ratified.
The proposed flow can be found at this link:
 
http://www.vhdl.org/pub/ibis/macromodel_wip/archive/20091118/arpadmurany
i/Final%20AMI%20flow%20for%20IBIS%205.1/AMI_Flows_5_final.pdf
 
Please let us know if you have any other questions or
suggestions.
 
Thanks,
 
Arpad
=====================================================
 
________________________________

From: Muranyi, Arpad 
Sent: Wednesday, November 18, 2009 10:38 AM
To: ibis-users@eda.org
Subject: RE: [IBIS-Users] AMI convolution


Eric,
 
The IBIS 5.0 AMI flow looks like this in a graphical
representation:
 
[screen shot deleted]
 
I hope this helps.
 
Arpad
==========================

________________________________

From: owner-ibis-users@server.eda.org
[mailto:owner-ibis-users@server.eda.org] On Behalf Of Eric Monteiro
Sent: Wednesday, November 18, 2009 9:55 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] AMI convolution


Hi everyone,
 
I was hoping someone could clarify who is responsible for convolution in
IBIS-AMI (EDA tool, or the modeler).
 
Clearly the convolution involving an FIR filter is upon the modeler, the
convolution I speak of is the one that is done with the channel
response.
 
My understanding has been as follows: (please correct me if I'm wrong)
 
(a) -- (Tx IC) -- (passive channel) --(b)--(Rx IC)
 
You force an impulse at (a), measure the response at (b).  (b) is the
analog channel response hAC(t).  GetWave then needs a wave, which should
be an ideal bit train, convolved with the bit period (creates a piece
wise linear wave) which is then convolved with hAC(t) to produce the
wave fed into GetWave.  There was discussion as to whether the modeler
or the EDA tool should do the above convolution.  Has it been decided
who this task falls on?
 
Best Regards,
Eric Monteiro

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