[SI-LIST] Re: Split Plane Routing
- From: Matthew Humphreys <humps@xxxxxxx>
- To: "Si-List@Freelists. Org" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 1 Feb 2002 08:40:51 -0800
Hi Pat,
May I ask why you need to split the gnd planes?
Also, shouldn't pwr2 be whichever plane is most heavily used, (IE. The plane
supplying most of the high-speed signals) not necessarily the highest
voltage?
Matt
-----Original Message-----
From: Ken Cantrell [mailto:Ken.Cantrell@xxxxxxxxxxx]
Sent: Friday, February 01, 2002 8:10 AM
To: psharkey@xxxxxxxxxxx; Si-List@Freelists. Org
Subject: [SI-LIST] Re: Split Plane Routing
Pat,
Other than NEVER(personal opinion)splitting the ground plane:
1 - S1
2 - pwr1 (lowest voltage)
3 - S2
4 - gnd
5 - pwr2 (highest voltage)
6 - S3
7 - gnd
8 - S4
would work. If emissions are still an issue, flood the top and bottom.
That may not fix your emissions, but it will reduce it. The way the board
is tied to the chassis is just as critical as the board emissions
themselves. There are times when you have to split the ground plane, but
you should, in general, resist any push to do this. If it is a "must do",
then minimize the number of traces crossing the split, and confine the type
of traces to slow and/or aperiodic signals.
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Pat Sharkey
Sent: Friday, February 01, 2002 7:10 AM
To: Si-List@Freelists. Org
Subject: [SI-LIST] Split Plane Routing
Hello all,
Given the following stackup with planes split in different areas -
1 - S1
2 - GND (SPLIT 1)
3 - S2
4 - GND(SPLIT 2)
5 - POWER(SPLIT 3)
6 - S3
7 - GND (SPLIT 4)
8 - S4.
For a signal which originates on layer 8, should the signal only be
routed on layers 6 & 8? Or, can layers 1 and 3 also be used to cross
a plane split on layer 7, assuming layers 2 and 4 are not split in the
same place (z axis)?
Thanks in advance,
Pat
------------------------------------------------------------------
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 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
------------------------------------------------------------------
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 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
------------------------------------------------------------------
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 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:
