[SI-LIST] Re: Crosstalk between two planes

Jaison,
Try to route all address/cmd/ctrl on one layer and data,clock on another
layer.Sig#1 and Sig#2 traces should not cross each other.Increase the
dielectric space between sig#1 and sig2,which must be higher than Sig-Gnd
spacing.Its better if you route the high speed traces on outer layers and
route low speed signal on inner layers.

On Thu, Jun 17, 2010 at 1:36 PM, Jaison Fernandez (RBEI/EED2) <
Jaison.Fernandez@xxxxxxxxxxxx> wrote:

> Dear Experts,
> I have a layer stack up like  as follows:
>
> 1. Top
> 2. Gnd1
> 3. Power
> 4. Gnd2
> 5. Sig1
> 6. Sig2
> 7. Gnd3
> 8. Bottom
>
>
> My board is one which contains ATMEL AT91SAM9M10, 128MB SDRAM (166MHz), GPS
> Chip solution, High current motor Drivers etc.
>
> I placed Atmel and SDRAM in bottom layer and routed the SDRAM signals in
> Sig1 and Sig2 planes.
> Could any one tell me the chances crosstalk between sig1 and Sig2 planes
> and possible ways to avoid it.
> Due to some tool limitations I can't able to due any POST SI
> analysis.(Stack up of Layer1 to Layer 3 is fixed due to some high current
> applications)
>
> Regards,
> Jaison Fernandez
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-- 
bala


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