[SI-LIST] Re: 6 layers stackup
- From: "Raju, Ramakrishna" <ramakrishna.raju-Contractor@xxxxxxxxxxxxxxx>
- To: I Ilamparidhi <ilam.paridhi@xxxxxxxxx>
- Date: Fri, 25 Apr 2008 11:17:41 +0530
Hi Ilam,
Good question,
In most of the PCB Designs Ground bounce is caused by the simultaneous
switching of drivers in an
IC package and it may cause functionality as well as EMI related issues.
Ground Bounce presents a situation where the ground reference system is
not immediate to the Ground chip pins.
Let me know weather I have answered your question.
Regards,
Ram
________________________________
From: I Ilamparidhi [mailto:ilam.paridhi@xxxxxxxxx]
Sent: Friday, April 25, 2008 10:57 AM
To: Raju, Ramakrishna
Cc: David Instone; Saoer Sinaga; si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: 6 layers stackup
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
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
Other related posts:
