[SI-LIST] Re: si-list@freelists.org
- From: Rui Pimenta <rpimenta@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 18 Apr 2005 17:32:11 +0200
Dear Mark and Tim,
Apart from the force, I am worried that at such magnetic field will change their
properties. Probably they will saturate and then the filter will become another
thing.
In terms of frequency I want as fast as possible. I will have optical
transceivers close
to the FPGA ~ 6 in.
I did not contact Murata, I'll do it right away. But if you could get some
information
from them would be great.
Did you, (Mark/Xilinx), do any tests without these ferrite beads?
Thank you once more,
Rui Pimenta
On Mon, 18 Apr 2005 08:23:57 -0600
"Mark Alexander" <mark.alexander@xxxxxxxxxx> wrote:
> Rui,
>
> Are you concerned that these Ferrite beads will experience a force from
> the 5T field? I haven't looked into this myself. Have you consulted
> Murata on the matter? I've got a contact over there I can check with if
> you like.
>
> As for the frequencies you're operating at... Tim wasn't quite right
> with his comment. Lower data rates don't necessarily equate to higher
> jitter tolerance or power supply noise rejection, as the vulnerabilities
> of the CDR are fairly complex. Our testing suggests that the best
> jitter tolerance is achieved between 2.5 Gbps and 3.125 Gbps for the
> Virtex-2 Pro RocketIO transceivers.
>
> -mark
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Rui Pimenta
> Sent: Monday, April 18, 2005 4:55 PM
> 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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