[SI-LIST] Re: 10 Layer Stackup Recommendation for Board with High speed Signals(SERDES/DDR)

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: Jory McKinley <jory_mckinley@xxxxxxxxx>
  • Date: Wed, 08 Aug 2012 12:20:41 -0700

There are a couple of problems:
1. Unbalanced construction
2. The top could be useless as a plane depending on what and how many 
parts are used.

Best Regards,

Steve.
On 8/8/2012 11:21 AM, Jory McKinley 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
> phone: (774)-285-2859
> ------------------------------------------------------------------------
> *From:* steve weir <weirsi@xxxxxxxxxx>
> *To:* 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
> >
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> -- 
> Steve Weir
> IPBLOX, LLC
> 150 N. Center St. #211
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-- 
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.



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