[SI-LIST] Re: 14 Layer Stackup

Why do you think you have to route differneital pairs broadside coupled? 
I'm interpreting your statement that this means in two adjacent layers.  Is
that correct?


> [Original Message]
> From: <jain.nitin@xxxxxxxxx>
> To: <leeritchey@xxxxxxxxxxxxx>
> Cc: <si-list@xxxxxxxxxxxxx>
> Date: 6/19/2006 6:34:31 PM
> Subject: [SI-LIST] Re: 14 Layer Stackup
>
>
> Hello Lee,
>
> Thanks for the information. I had thought about the stackup you just
> suggested. I have a issue with this stackup. I have lot of high speed
> differential nets to be routed and if I use the stackup you suggested
> I'll have to route in board side coupled fashion which is not easy (in
> terms of cost, reliability etc). What do you think if I have some kind
> of following arrangement:
> Top           1
> Signal        2
> Plane         3 Vdd1
> Signal        4
> Plane         5 Gnd
> Plane         6 Vdd2
> Signal        7
> Signal        8
> Plane         9 Gnd
> Plane         10 Vdd3
> Signal        11
> Plane         12 Gnd
> Signal        13
> Bottom        14
>
> I think you might not very comfortable with Vdd1 in layer 3. What issues
> I can face if I go with above stackup.
>
> With regards,
> Nitin
> =0D
> -----Original Message-----
> From: Lee Ritchey [mailto:leeritchey@xxxxxxxxxxxxx]=0D
> Sent: Monday, June 19, 2006 8:14 PM
> To: Nitin Jain (WT01 - Broadband Networks); si-list@xxxxxxxxxxxxx
> Subject: RE: [SI-LIST] 14 Layer Stackup
>
> Jain,
>
> I'd suggest you change the stackup as I have shown below.  Then, I'd
> make layer assignments as shown.
>
>
> > [Original Message]
> > From: <jain.nitin@xxxxxxxxx>
> > To: <si-list@xxxxxxxxxxxxx>
> > Date: 6/19/2006 10:01:00 AM
> > Subject: [SI-LIST] 14 Layer Stackup
> >
> >
> > Hello,
> >
> > We are planning to use 14 layer stackup for our design. In our stackup
>
> > we have total 6 planes and we are planning to use 3 planes as power=0D
> > planes and hence we are left with 3 gnd planes. Now I want to know is=0D
> > there any defined strategy to assign planes as pwr or gnd. In other=0D
> > words which plane should be assigned as pwr and which should be=0D
> > assigned as gnd.=3D0D =3D0D The 14 layer stackup looks like this:
> >
> > Top         1       top
> > Signal      2       Signal
> > Plane       3       Plane   Gnd
> > Signal      4       Plane   Vdd1
> > Plane       5       Signal
> > Plane       6       Signal
> > Signal      7       Plane   Gnd
> > Signal      8       Plane   Vdd2
> > Plane       9       Signal
> > Plane       10      Signal
> > Signal      11      Plane   Vdd3
> > Plane       12      Plane   Gnd
> > Signal      13      Signal
> > Bottom      14      Bottom
> >
> > With regards,
> > Nitin
> >
> >
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