[SI-LIST] Re: Intel Motherboard with DDR2

Chris,
You are correct, there was no recommendation in that presentation to
have
1/2 oz signal and 2 oz power plane on the other side.  That was just my
EXTREME example to highlight the difference between your response and
Jon's comment.  A balanced stackup could be made with very un-balanced
cores.

Intel's stackup was well balanced with respect to both cores and overall
stackup.


Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592

-----Original Message-----
From: Chris Cheng [mailto:Chris.Cheng@xxxxxxxxxxxx]=20
Sent: Tuesday, February 22, 2005 11:35 AM
To: Sparkman, Aubrey; Chris Cheng; 'si-list@xxxxxxxxxxxxx '
Subject: RE: [SI-LIST] Re: Intel Motherboard with DDR2

Aubrey,
I don't think there was any recommendationin in that presentation to
have
1/2 oz signal and 2 oz power plane on the other side. Did I missed
anything ?

-----Original Message-----
From: Aubrey_Sparkman@xxxxxxxx
To: Chris.Cheng@xxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Sent: 2/22/2005 8:21 AM
Subject: RE: [SI-LIST] Re: Intel Motherboard with DDR2

 Chris,
Jon said " balanced ***cores*** (S-S or plane-plane)"

He did not say balanced stackups.  Both must be considered in
production.  Severely unbalanced  ***cores***  (such as one with a 2 oz
reference plane on one side and a HALF oz signal layer on the other
side) will warp like a potato chip suffer yield problems BEFORE it gets
to the step where all the cores are combined.


Aubrey Sparkman
Enterprise Engineering Signal Integrity Team Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx
(512) 723-3592

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