FreeLists / si-list / [SI-LIST] Re: 10 Layer Board Stack up

["Nagaraj" <nagaraj@xxxxxxxxxxxxxxxxxxxx>]

Hi,

We cann't Provide more GND Plane ( 4 ) as you specified and There is no
Provision for

Splitting VCC2.5 in VCC3.3 Plane as There are 12V and 5 Volts are Already
Shared the VCC3.3 and 2.5 Plane

Is there any Other Layer Stack up Can you Suggest.

My Question is Why Multiple Ground are Very much Needed?



Thanks in Advance

Regards

Nagaraj



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of
vasudevan.duraiswamy@xxxxxxxxxxx
Sent: Monday, December 02, 2002 5:34 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 10 Layer Board Stack up



Hi,

It is correct that the layers should be symmetrical, to provide better
copper balancing,

Power planes are generally defined by

      power integrity / decopling requirement

      impedance requirement

                Routability

Your stack up can be modified as follows

1)Top Signal 1
2)GND
3)Signal 2
4)VCC3.3
5)GND
6)VCC2.5
7)GND
8)Signal 3
9)GND
10)Bottom Signal 4


     Routing, switch  the signals between layer pair Top Signal 1 and Signal
2  or  between layer pair Bottom Signal 4 and Signal 3

     Don't  switch over routing between  Signal 1/2  to Signal 3 / 4

Incase of more routing layer requirement,  make layer 4 & 7 also routing
layer , make layer 5 split power plane of VCC 3.3 & 2.5, make layer 6 as GND

Regards,

Vasudevan D
Technical Leader - PCB Design, CFT
Philips Software Centre Pvt Ltd,
Philips Innovation Campus,
# 01, Murphy Road, Ulsoor,
Bangalore - 560 008. India
Tel: +91 80 5579 000 extn : 5030
fax : +91 80 5546 645



                      stephanie.goedecke+FromInterNet@
                      philips.com                                  To:
si-list@xxxxxxxxxxxxx
                      Sent by:                                     cc:
(bcc: Vasudevan Duraiswamy/BTC/CFT/PHILIPS)
                      si-list-bounce@xxxxxxxxxxxxx                 Subject:
[SI-LIST] Re: 10 Layer Board Stack up


Classification:
                      2002-12-02 02:48 PM
                      Please respond to
                      stephanie.goedecke+FromInterNet







Hi,

generally, the layers should be symmetrical.  The details of the layout
depend on the
details of the board.

Stephanie Goedecke

Philips - SP3D Chip Design GmbH
Petersbrunnerstr.17
82319 Starnberg / Germany

Phone:  +49-8151-270-160
Fax : +49-8151-270-200



Hi ,

In 10 Layer Board stack How Multiple Ground Plane Will be More effective and
Why.

Is there any Formula/Thumb rule behind this.

most of my Critical Signal ( CLK)  are Running at Signal Layer 1
and My Board Stack up is

Top
GND
Signal Layer 1
VCC3.3
GND
VCC2.5
Signal Layer 2
Signal Layer 3
GND
Bottom



Thanks in Advance.

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