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.