[SI-LIST] Re: GMII over Board-to-Board Connector
- From: "Michael Khusid" <mkhusid@xxxxxxxxxx>
- To: <Paul_Strachan@xxxxxxxxxxxxxxxxxx>
- Date: Fri, 15 Nov 2002 14:59:50 -0500
Paul,
About a year or two ago, I was involved in a design where GMII interface
ran through a parallel board-to-board connect. GMII is a
source-synchronous signal, so the timing of the bus is fairly
straightforward as long as your connector pins have the same length.
For the crosstalk purposes -- well, you do need a connector which is
good enough for this purpose. We used the Teradyne/Molex HDM parallel
board-to-board connector. It is specified to 0.5ns to 1ns rise time
depending on the grounding pattern and we were quite comfortable as long
as the grounding was sufficiently conservative.
The connector had press-fit interface on the mainboard and the solder
interface on the PHY extension card.
Best regards,
-----------------------------------------------------------------
Michael Khusid
Ansoft Corporation
SI/HF Application Engineer
25 Burlington Mall Road, 6th floor
Burlington, MA 01803-4100
Tel 781-229-8900 Ext. 34
Fax 781-229-8624
--------------------- http://www.ansoft.com ---------------------
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Paul Strachan
Sent: Friday, November 15, 2002 2:35 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] GMII over Board-to-Board Connector
Hi SI Group,
We are working on a module which requires a GMII interface to it's
carrier card. I know that the GMII interface is intended for IC to IC
communication, but I am wondering if anyone has successfully connected
GMII over a board-to-board connector? If so what type of connector was
used and was there any problems with crosstalk? Or was there any problem
with the signal degrading such that it was no longer compliant to the
GMII receiver input potential template?
We're nervous about the rise and fall times for the GMII clock, which
are 0.7ns to 1.0ns. This works out to a knee frequency of 700 to 500Mhz
and for single ended applications these frequencies are pushing the
capabilities of many common connector styles.
Any comments would be much appreciated.
Thanks,
Paul Strachan
Spectrum Signal Processing
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