[SI-LIST] FW: diff pair routing at 10gig
- From: "Mike Finczak" <mike@xxxxxxxxxxxxx>
- To: "'si-list'" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 31 May 2007 10:45:06 -0400
Moshe,
The XFP connector datasheets indicate that bare metal would be
touching the board. If you use an insulator, it could be routed
on the outer layer, but would add extra manual labor to install.
I did not have this option, and routed using two vias. I tried
to minimize any via stubs by routing the signal through most of
the via barrel (see the attached picture) and created special
via padstack that had circular route keepouts in place of any
internal unconnected via pads.
P.S. Also double check your BGA's. One the manufacturer's preliminary
datasheets showed the BGA pin pitch at 1.27 mm, in reality it
was 1.0 mm.
Regards,
Mike Finczak
CopperCAD Design
www.CopperCAD.com
905-488-8958
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Moshe Frid
Sent: Wednesday, May 30, 2007 4:19 AM
To: si-list
Subject: [SI-LIST] diff pair routing at 10gig
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
=20
Hello all
=20
Can someone help me with routing issue of diff pair at 10gig from serdes
chip to XFP connector=20
I have 2 options -=20
1. Rout in outer layer (cs) without vias with solder mask cover
reference plane in layer 2 (the traces will go under the xfp cage would
it be a problem)
2. Rout it in inner layer in strip line between to planes but with 2
vias per line=20
=20
What should work best for me
=20
thanks
________________________________
Moshe Frid=20
Senior PCB Designer=20
Adcom Computers and Communications Ltd.
17 Ha'Tidhar st., Ra'anana
Israel 43665
Tel: +(972)-9-7417411 ext. 108
Fax: +(972)-9-7417422
Mobile: +(972)-54-6573232
E-mail: moshef@xxxxxxxxxxx
<http://www.adcom.co.il>=20
=20
=20
-- Binary/unsupported file stripped by Ecartis --
-- Type: image/jpeg
-- File: image001.jpg
-- Desc: image001.jpg
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
-- Binary/unsupported file stripped by Ecartis --
-- Type: image/gif
-- File: Routing Topology.GIF
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
