[SI-LIST] Re: si-list@freelists.org
- From: "Viaene, Tim" <tim.viaene@xxxxxxxxx>
- To: "'rpimenta@xxxxxxxxxx'" <rpimenta@xxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Mon, 18 Apr 2005 11:26:45 +0200
Dear Rui,
It is not as bad as it looks.
The noise on the supply gives phase jitter on the rocket io clock. As you
are using your rocket io at 1Gig instead of the maximum 3.3 Gig your margin
for jitter is much bigger.
I do not expect any problem -without bead - if you are using your link in
"normal applications"
normal means : limited link length; no backplane ;or to an optical connector
You can place an 0603 footprint on the layout, place a 0ohm resistor and -if
needed- place a small value.
If you have more info on your link i can give you more feed-back.
Best Regards,
Tim,
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Rui Pimenta
Sent: Monday, April 18, 2005 10:55 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] si-list@xxxxxxxxxxxxx
Dear all,
I am designing a new PCB boards which contains the Virtex-II pro
XC2VP50-5FF1152C. I want
to use 12 RocketIO Transceivers with speeds above 1Gb/s.
These boards will be working in a heavy-ion detector under a magnetic field
of ~5 Tesla.
^^^^^^^^
As discribed, in Xilinx user guide ug024 page 111, it is recommended the use
of ferrite
beads from Murata for the power filtering on each transceiver power pin.
Since I have a magnetic field of ~5 Tesla I have some questions:
1- Is there any other way of designing these power filters without using
ferrite/coils,
and similar performance?
2- What are the risks that I will be taken if I don't place the ferrite? The
RocketIOs
will not work?
3- Any suggestions for overcome this issue?
I have inquired Xilinx on this matter and I am waiting for their answer.
What I am afraid
is that their answer may include something like: We cannot guarantee
anything that goes
out of specs. Which doesn't help me.
That is why I am contacting the list seeking for suggestions/advises.
Thanks in advance,
Rui Pimenta
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