[SI-LIST] Re: 10 Layer Board Stack up

  • From: vasudevan.duraiswamy@xxxxxxxxxxx
  • To: si-list@xxxxxxxxxxxxx
  • Date: Mon, 2 Dec 2002 15:04:17 +0530

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


                                                                                
                                                                                
       
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[SI-LIST] Re: 10 Layer Board Stack up                                           
         
                                                                                
                                                                                
       
                                                                   
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                      2002-12-02 02:48 PM                                       
                                                                                
       
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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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