[ibis-macro] Re: Backchannel BIRD discussions
- From: Ambrish Varma <ambrishv@xxxxxxxxxxx>
- To: "twesterh@xxxxxxxxxx" <twesterh@xxxxxxxxxx>, "ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
- Date: Mon, 19 May 2014 08:24:32 -0700
Hi Todd,
We propose to publish 3 .bci files for recent standards as samples with the
BIRD. We can discuss the details of the contents when we are finalizing the
BIRD. Any future .bci files will be based on the protocols that become
available. We will set aside time in the IBIS Open Forum for discussing the new
.bci file at which point we may relegate the discussion/approval to the IBIS
ATM. Once approved, these files will be publicly available at the IBIS website
in a separate directory.
These .bci files will be parsed/tested using the latest IBIS parser before
getting posted so there should be no surprises at run time.
Thanks,
Ambrish.
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Todd Westerhoff
Sent: Monday, May 19, 2014 9:41 AM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Backchannel BIRD discussions
All,
Did we identify the means by which .bci files will be defined and
standardized going forward?
Todd.
Todd Westerhoff
VP, Semiconductor Relations
Signal Integrity Software Inc. . www.sisoft.com
6 Clock Tower Place . Suite 250 . Maynard, MA 01754
(978) 461-0449 x124 . twesterh@xxxxxxxxxx
"I want to live like that"
-Sidewalk Prophets
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Ambrish Varma
Sent: Monday, May 19, 2014 12:41 AM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Backchannel BIRD discussions
Thanks Arpad,
I would like to take this opportunity to point out the main highlights of
the Cadence proposals:
- Our proposal implements a traditional backchannel system where the
entire job of the EDA tool is to open a communication channel between the
Tx and Rx and let them communicate without the need for the EDA tool to
interpret anything from the Tx or the Rx. Once the training is completed,
the EDA tool detects the 'Traning_Done' parameter and closes the
communication channel.
- Our proposal also allows for flexible interaction between the Tx and Rx
based on a particular protocol. The details of the taps or any other
parameters are encapsulated in a separate BCI file that is pointed to in
the AMI file based on the protocols that are supported by the AMI model.
There is no hardcoded methods of communication that the other method
prescribes.
- The flexibility to implement and support a 'Private Protocol' is also
possible without any further addition of Reserved Parameters.
- The backchannel related parameters for training and any protocol
specific parameters are confined to the BCI file - the contents of which
(for a published protocol) are decided by IBIS and will be available
publicly for anyone to see/implement in their AMI models. This leaves the
.ami file relatively clean (with a couple of top level backchannel related
parameters).
These are a few salient features of our proposal. I would also like to
point out that we have had the backbone of the proposal (passing a
parameters string back and forth from the Tx to the Rx and vice versa)
tested in many models. In other words, this is a tried and tested method
and will add tremendous value to AMI and the IBIS specification and will
fill a huge void in how real devices are modeled.
We would be glad to answer any question that might still be out there
about our proposal.
Regards,
Ambrish.
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Friday, May 16, 2014 6:26 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Backchannel BIRD discussions
Hello everyone,
First, I would like to draw your attention to two presentations which have
been posted recently on the ATM website from Cadence and SiSoft on the
topic of Backchannel AMI modeling.
http://www.vhdl.org/pub/ibis/macromodel_wip/archive/20140506/ambrishvarma/
The%20BCI%20File/BCI_File_and_Communications.pdf
http://www.vhdl.org/pub/ibis/macromodel_wip/archive/20140513/walterkatz/Ba
ckchannel%20Training%20Co-Optimization/Backchannel_Training_%20Co-Optimiza
tion%20BIRD.pptx
Once again, our discussions are at crossroads and some important decisions
need to be made. I would like to make a request to everyone to become
familiar with the two proposals and be ready to express your opinion
and/or preference in the upcoming IBIS-ATM teleconference. I would like
to encourage IC vendors and model makers to pay attention to this
discussion and express your opinion in this discussion because the
decision we are about to make will have a great effect on how models with
Backchannel training and optimization features will have to be written.
Thanks in advance,
Arpad
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