RE: [SI-LIST] : which layers should I use for routing my high spe ed traces

About this list Date view Thread view Subject view Author view

From: Moran, Brian P (brian.p.moran@intel.com)
Date: Mon May 07 2001 - 12:29:07 PDT


Saeen,

Just as a side. Did I read your stack up correctly, that your building an 11
layer board. I assume your PECLPWR layer is actually two layers. If not
I'd check with your board vendor about non-symetrical stack ups. I'd be very
uncomfortable with that arrangment. As far as layer assignments, grounds
always make good return current planes, for either edge.

Brian P. Moran
Signal Integrity Engineer
Intel Corporation
brian.p.moran@intel.com

-----Original Message-----
From: Greim, Michael [mailto:mgreim@sonusnet.com]
Sent: Monday, May 07, 2001 11:58 AM
To: 'Saeen Malik'; si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : which layers should I use for routing my high
spe ed traces

Ok,

I'll ask the obvious question. If all you have is
peclpower and ground, why don't you simply change
layer 3 and 9 to peclpower and layer 6 to ground
and then you would have the most flexibility in your
design. Then you could route on any of the layers.

Whaddya think?

Best Regards,

Michael C. Greim Sonus Networks
mgreim@sonusnet.com 978-589-8336

Making the world safe for digital signals everywhere

And all this science I don't understand
It's just my job six days a week

The time is gone. The email's over
Thought I'd something more to say......

-----Original Message-----
From: Saeen Malik [mailto:saeens@hotmail.com]
Sent: Monday, May 07, 2001 2:38 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : which layers should I use for routing my high speed
traces

I have the following stackup. I need to route 644 MHz. PECL signals. Which

layers should I use

------------------ gnd
      ---- route layer 1
------------------ gnd
      ---- route layer 2
      ---- route layer 3
------------------ peclpower
      ---- route layer 4
      ---- route layer 5
------------------ gnd
      ---- route layer 6
------------------ gnd

My inclination is to use layers 2,3 and 4,5 because it would provide return

path for
both cases - switching high and low. On the other hand if I use the single
stripline layers,
the return current when the device switched high would have to go through a
cap to enter the power
pin.

What do you people think???

Saeen
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Jun 21 2001 - 10:11:51 PDT