[SI-LIST] Re: 6 layers stackup
- From: "I Ilamparidhi" <ilam.paridhi@xxxxxxxxx>
- To: "Raju, Ramakrishna" <ramakrishna.raju-Contractor@xxxxxxxxxxxxxxx>
- Date: Fri, 25 Apr 2008 10:56:34 +0530
Hello Ram,
Why do you say 'G' is better than 'P' for chip pins?
Please explain me.
Thanks
Ilam
On Thu, Apr 24, 2008 at 2:31 PM, Raju, Ramakrishna <
ramakrishna.raju-Contractor@xxxxxxxxxxxxxxx> wrote:
> Hi,
>
> Apart from the previous threads, the basic idea to use G layer next to
> top layer is that the return path for the chip pins will be good compare
> to P layer.
>
> Regards,
> Ram
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of David Instone
> Sent: Thursday, April 24, 2008 2:05 PM
> To: Saoer Sinaga
> Cc: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: 6 layers stackup
>
> I think your question is 'why have the G layer nearest the top of the
> board rather than the P layer?' Probably because the chips are
> generally on the top side of the board and having the the G layer
> nearest means your hi-speed racks can reference G rather than P without
> needing vias. Of course with a good decoupling referencing P rather
> than G might not be a problem, see previous threads on this list re
> referencing G or P. However, the G layer is generally one complete area
> over the board while the P layer must often be split into sections for
> different voltages; giving rise to problems where signal traces have to
> cross the splits
>
> Regards
> Dave Instone
> +44 (0)1235 824963
>
> OXFORD SEMICONDUCTOR LIMITED
> 25 MILTON PARK
> ABINGDON
> OXFORDSHIRE
> OX14 4SH
> Registered in England no 2733820
> Registered Address: As above
>
>
>
> Saoer Sinaga wrote:
> > Dear all,
> > May I know the reason why people would generally use S1 S2 G P S3 S4
> > configuration for six-layer stackup? Why not S1 S2 P G S3 S4?
> > Thanks.
> >
> > regards,
> > Saoer
> >
> > On Wed, Feb 20, 2008 at 11:17 PM, Fernando Yuitiro Mori
> <mori@xxxxxxxxxxxxx>
> > wrote:
> >
> >
> >> Hi,
> >> I normally use S1 S2 G P S3 S4 for the 6 layers stackup. I need the 4
> >> layer with 60 ohms, so there are some problem if I use S1 G S2 S3 P
> S4?
> >>
> >> Regards,
> >>
> >> Fernando Mori
> >> ------------------------------------------------------------------
> >> 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 technical documents are available at:
> >> http://www.si-list.net
> >>
> >> 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 technical documents are available at:
> > http://www.si-list.net
> >
> > 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 technical documents are available at:
> http://www.si-list.net
>
> 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
>
>
>
> CONFIDENTIALITY
> This e-mail message and any attachments thereto, is intended only for use
> by the addressee(s) named herein and may contain legally privileged and/or
> confidential information. If you are not the intended recipient of this
> e-mail message, you are hereby notified that any dissemination, distribution
> or copying of this e-mail message, and any attachments thereto, is strictly
> prohibited. If you have received this e-mail message in error, please
> immediately notify the sender and permanently delete the original and any
> copies of this email and any prints thereof.
> ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT
> INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform
> Electronic Transactions Act or the applicability of any other law of similar
> substance and effect, absent an express statement to the contrary
> hereinabove, this e-mail message its contents, and any attachments hereto
> are not intended to represent an offer or acceptance to enter into a
> contract and are not otherwise intended to bind the sender, Sanmina-SCI
> Corporation (or any of its subsidiaries), or any other person or entity.
> ------------------------------------------------------------------
> 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 technical documents are available at:
> http://www.si-list.net
>
> 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
>
>
>
--
I. Ilamparidhi
Design Engineer
Freescale Semiconductor India Pvt. Ltd.
Mobile No : +91-9999036561
Office No : 0120-439-3538
Fax No : 0120-425-3625
------------------------------------------------------------------
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 technical documents are available at:
http://www.si-list.net
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:
