[ibis-macro] Re: AMI-init should pass modified IR to getwave....
- From: "Walter Katz" <wkatz@xxxxxxxxxx>
- To: <kukal@xxxxxxxxxxx>, "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
- Date: Thu, 14 Jun 2012 04:55:03 -0400 (EDT)
Kukal,
Who are "those" in you statement "those who want to leverage init as
complement to getwave and those who want to keep statistical-flow purely
independent."
Walter
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Taranjit Kukal
Sent: Thursday, June 14, 2012 2:04 AM
To: 'IBIS-ATM'
Subject: [ibis-macro] AMI-init should pass modified IR to getwave....
Hi All,
When I was implementing AMI model, I found a situation where it was
important that Rx ami_init needed to pass modified-IR to getwave function.
Reason was that Chip-RDL-routing was available as Impulse-Responses.
Removal for "Use_Init_Output" to make Statistical-flow independent of
Transient-flow, is going to break the original intent where init and
getwave were supposed to work in conjunction with each other handling
linear and non-linear filtering portions respectively (as shown below)
cid:image001.png@01CD49C5.F040DCA0
I would go back to Arpad's suggestion (year 2010) for having two
Impulse-responses coming out of ami_init
- One that goes to EDA tool for statistical flow
- One that gets passed to getwave to allow splitting of
modeling-effort across init and getwave and make things easy for linear
filters.
BIRD120 was brought up that deprecates use of "use_init_output" with a
view to keep statistical and time-domain simulations independent. But as I
think more, we need to allow both capabilities. It absolutely does not
make sense to implement simple linear filters within getwave when we can
convolute the filter-IR with channel-IR. We should take all steps to make
modeling easy and ensure enough flexibility.
This way, we cover both the scenarios - those who want to leverage init as
complement to getwave and those who want to keep statistical-flow purely
independent. Since this does not bring any disadvantage, I strongly feel
that we all re-consider outputting two modified-IRs out of init function -
one for statistical-flow and another one to complement getwave filtering.
Rgds
..kukal
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