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 > ------------------------------------------------------------------ > 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 technical documents are available at: > http://www.si-list.net > > 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 > > > -- bala ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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