Hi Arpad,
I don't remember in what context the conversations you mentioned took place in
the meeting. Nonetheless, my proposal does cover the case Rx2 includes
optimization, as stated on the first page of my 24-MAY-2016 presentation in the
IBIS archive. That's one of the purposes of adding the additional IR-s.
Regards,
Fangyi
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] ;
On Behalf Of Muranyi, Arpad
Sent: Tuesday, May 09, 2017 1:14 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Fangyi and I had an AR to describe what bad things
can happen if IBIS 166.2 is approved in 7.0 and the Keysight BIRD with
additional IR is approved in IBIS 7.1 ...
Fangyi,
Since we ran out of time in the meeting, I didn't want to
"argue" this point, but I am confused by your answers you
gave me at two different times in the meeting.
At one point you stated that you did NOT address the case
in your solution which is when the Rx2 has some sort of
optimization to figure out its taps.
Later you said that the additional IR-s you are proposing
covers that case.
These two answers seem to be in contradiction. Could you
please explain what you meant by them, and whether your
proposal really covers the case when Rx2 includes any
optimization?
Thanks,
Arpad
=============================================================
From: ibis-macro-bounce@xxxxxxxxxxxxx<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of ;
fangyi_rao@xxxxxxxxxxxx<mailto:fangyi_rao@xxxxxxxxxxxx>
Sent: Monday, May 08, 2017 3:17 AM
To: wkatz@xxxxxxxxxx<mailto:wkatz@xxxxxxxxxx>;
ibis-macro@xxxxxxxxxxxxx<mailto:ibis-macro@xxxxxxxxxxxxx>
Subject: [ibis-macro] Re: Fangyi and I had an AR to describe what bad things
can happen if IBIS 166.2 is approved in 7.0 and the Keysight BIRD with
additional IR is approved in IBIS 7.1 ...
(Resend with typo fixed)
All,
In the attached doc I showed that the BIRD166 flow may unphysically amplify
redriver nonlinearity, internal noise and crosstalks when they reach downstream
DFE and that this amplification equals the upstream channel loss in dB. This
problem can't be resolved by incremental changes in current flow. That's why
additional columns are added to impulse response matrix in the Keysight BIRD.
BTW, there is no need to count the number of possible combinations. As more
aggressors and cascaded redrivers are added to the link, this number will keep
growing. The flow in the Keysight BIRD, described in a separate doc, is
designed in a scalable way so that one only needs to deal with 4 basic
combinations and all others are automatically covered.
Fangyi
