[SI-LIST] Re: 10 Layer Stackup Recommendation for Board with High speed Signals(SERDES/DDR)
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Joel Brown <joel@xxxxxxxxxx>
- Date: Wed, 08 Aug 2012 12:25:28 -0700
If you can tolerate the impact on power delivery, that 12 layer stack-up
works. It requires about 3X the number of bypass capacitors as the
other stack-up for the same impedance. What you get out of it is core
between the S / G layers which has better thickness control than
prepreg. You also get Vss reference on all routing layers.
Steve.
On 8/8/2012 11:40 AM, Joel Brown wrote:
> I understand that having the power near the outer layers reduces
> inductance of the PDN.
> But this is how we would typically do it:
>
> Top
> GND
> SIG1 - SERDES / DDR2/High Speed Signals
> SIG2 - DDR2
> GND
> POWER1
> POWER2
> GND
> SIG3 - DDR2
> SIG4 - SERDES / DDR2/High SpeedSignals
> GND
> BOT
>
> On Wed, Aug 8, 2012 at 11:21 AM, Jory McKinley
> <jory_mckinley@xxxxxxxxx <mailto:jory_mckinley@xxxxxxxxx>> wrote:
>
> How about this:
> TOP/GND
> SPLIT PWR1/2
> GND
> SIG1 - SERDES / DDR2/High Speed Signals
>
> SIG2 - DDR2
>
> GND
> SIG3 - DDR2
> SIG4 - SERDES / DDR2/High SpeedSignals
> GND/ISOLATED PWR (covered by bottom ground and no signal reference)
> BOTTOM/GND
>
>
>
>
>
> Jory McKinley
> McKinley Consulting
> e-mail: jory_mckinley@xxxxxxxxx <mailto:jory_mckinley@xxxxxxxxx>
> phone: (774)-285-2859 <tel:%28774%29-285-2859>
>
>
> ________________________________
> From: steve weir <weirsi@xxxxxxxxxx <mailto:weirsi@xxxxxxxxxx>>
> To: si-list@xxxxxxxxxxxxx <mailto:si-list@xxxxxxxxxxxxx>
> Sent: Wednesday, August 8, 2012 1:46 PM
> Subject: [SI-LIST] Re: 10 Layer Stackup Recommendation for Board
> with High speed Signals(SERDES/DDR)
>
> That stack-up could be in real trouble: Big cavities, plus lot's of
> single-ended injection usually spells trouble. If you plan to
> route the
> DDR2 Manhattan using L3 and L8 as a routing pair, then about your only
> hope is if you forgo Power2 and make that also GND. Otherwise,
> something will have to give.
>
> Steve
> On 8/8/2012 6:32 AM, Prashanth Rajappan wrote:
> > Hi All,
> > I am looking for suggestions for our PCB which has high speed
> interfaces like SERDES /DDR2/GIGA BIT Ethernet.The current
> stackup is given below.
> >
> > Top
> > GND
> > SIG1 - SERDES / DDR2/High Speed Signals
> > SIG2 - DDR2
> > POWER1
> > GND
> > SIG3 - DDR2
> > SIG4 - SERDES / DDR2/High SpeedSignals
> > POWER2
> > BOT
> >
> > PLease let me know your comments or suggestion regarding the same.
> >
> > Thank you in advance!
> >
> >
> > Regards
> > Prasanth
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx
> <mailto: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
> <mailto:si-list-request@xxxxxxxxxxxxx> with 'help' in the Subject
> field
> >
> >
> > List forum is accessible at:
> > http://tech.groups.yahoo.com/group/si-list
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
>
>
> --
> Steve Weir
> IPBLOX, LLC
> 150 N. Center St. #211
> Reno, NV 89501
> www.ipblox.com <http://www.ipblox.com>
>
> (775) 299-4236 <tel:%28775%29%20299-4236> Business
> (866) 675-4630 <tel:%28866%29%20675-4630> Toll-free
> (707) 780-1951 <tel:%28707%29%20780-1951> Fax
>
> All contents Copyright (c)2012 IPBLOX, LLC. All Rights Reserved.
> This e-mail may contain confidential material.
> If you are not the intended recipient, please destroy all records
> and notify the sender.
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx
> <mailto: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
> <mailto:si-list-request@xxxxxxxxxxxxx> with 'help' in the Subject
> field
>
>
> List forum is accessible at:
> http://tech.groups.yahoo.com/group/si-list
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> 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
> <mailto: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
> <mailto:si-list-request@xxxxxxxxxxxxx> with 'help' in the Subject
> field
>
>
> List forum is accessible at:
> http://tech.groups.yahoo.com/group/si-list
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
>
>
> --
>
> */Joel Brown/*/*
> */
>
> Chief Electrical Design Engineer
>
> *Z Microsystems, Inc.*
>
> 9820 Summers Ridge Rd.
>
> San Diego, CA 92121
>
> Tel: 858-831-7011 <tel:858-831-7011>
>
> Fax: 858-831-7001 <tel:858-831-7001>
>
> joel@xxxxxxxxxx<mailto:joel@xxxxxxxxxx>
>
> http://www.zmicro.com<http://www.zmicro.com/>
>
>
--
Steve Weir
IPBLOX, LLC
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
(866) 675-4630 Toll-free
(707) 780-1951 Fax
All contents Copyright (c)2012 IPBLOX, LLC. All Rights Reserved.
This e-mail may contain confidential material.
If you are not the intended recipient, please destroy all records
and notify the sender.
------------------------------------------------------------------
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 forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
