[ibis-macro] Back-channel BIRD discussion
- From: "Dmitriev-Zdorov, Vladimir" <vladimir_dmitriev-zdorov@xxxxxxxxxx>
- To: "ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 8 Apr 2014 20:21:37 +0000
Hi Walter,
A couple comments/questions about the presentation.
I agree that Rx optimization (e.g. made in INIT) can do almost everything since
Rx knows the channel's response. If Rx were to know how to set Tx equalization,
it could find the optimal tap coefficients and send them to Tx. This statement
remains true regardless of the backchannel support. Therefore there is a
question. Why in our regular flow we call Tx INIT prior to Rx INIT? Maybe we
should allow Rx INIT be first? Then, it can update impulse response
accordingly. If we have a mechanism to pass tap values from Rx to Tx, that's
fine. If we don't, then Tx can receive the impulse response modified by Rx
optimization and do the best it can.
Second is about making BCI file a property of Rx, a tempting idea, considering
that in the current BIRD BCI file should be read/understood by Tx, Rx and EDA
tool. The last is required in the current spec to allow EDA tool to generate
the training pattern, as required by the protocol. Making your proposal, do you
mean that Rx training can be made on any reasonable input, not only by that
specified by the back-channel communication protocol?
Vladimir
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Ambrish Varma
Sent: Wednesday, April 02, 2014 6:56 AM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Revised Backchannel BIRD
Hi All,
The latest version of the Backchannel BIRD (draft 8) has been uploaded on the
ATM website and is available here:
http://www.vhdl.org/ibis/macromodel_wip/archive/20140401/ambrishvarma/Backchannel%20support%20BIRD%20147%20draft%208/Backchannel_BIRD147_Draft8.docx
Or
http://tinyurl.com/o8cqyqr
This is the version that was discussed at the 04/01/2014 ATM and includes
support for AMI_Init/Statistical Backchannel training.
Please let me know if there are any questions.
Thanks,
Ambrish.
Ambrish Varma.
Cadence Design Systems.
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