[ibis-macro] Re: Backchannel BIRD discussions
- From: Ambrish Varma <ambrishv@xxxxxxxxxxx>
- To: "ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
- Date: Sun, 18 May 2014 21:41:14 -0700
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/Backchannel%20Training%20Co-Optimization/Backchannel_Training_%20Co-Optimization%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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