Fangyi,
If I understand your case, your BIRD solves this by adding the additional
IR outputs. Again, if I understand your case correctly, your BIRD does not
do any good on IBIS 6.1 models, since they do not have the additional IR.
Am I missing something. Maybe you can explain your case better in the ATM
meeting tomorrow.
Walter
Walter Katz
<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of
fangyi_rao@xxxxxxxxxxxx
Sent: Monday, May 8, 2017 6:20 PM
To: wkatz@xxxxxxxxxx; 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 ...
Hi Walter,
Regarding you question
What bad things happen if BIRD 166.3 is included in IBIS 7.0?
That's exactly what I answered in the doc I sent earlier, which shows how
your BIRD166 flow erroneously amplifies redriver nonlinearity (e.g.
limiting mode and compression), internal device noise and xtlk. The
erroneous amplification equals the upstream channel loss in dB. For
instance, if the upstream channel loss is 20dB, the amplification is 20dB.
Fangyi
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 8, 2017 4:17 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
From: ibis-macro-bounce@xxxxxxxxxxxxx
<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Walter Katz
Sent: Wednesday, May 03, 2017 11:40 AM
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx <mailto:ibis-macro@xxxxxxxxxxxxx> >
Subject: [ibis-macro] 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 ...
All,
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.
I am enclosing a presentation which is a short review of the current IBIS
166.2, and adds a section demonstrating that no bad things will happen if
166.2 is included in IBIS 7.0 and the Keysight BIRD with additional IR is
approved in IBIS 7.1.
In summary:
* There are 81 possible flows based on IBIS 6.1 models.
* There are 625 possible flows in the Keysight BIRD.
* The 81 flows in IBIS 7.0 remain the same in IBIS 7.1.
Therefore the flows in IBIS 7.1 will not change any of the flows in IBIS
7.0.
Walter
Walter Katz
<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156
