Ivor, be afraid of that stack-up. Be very afraid. With only layer 2 as ground, I expect it to be an EMC and signaling nightmare. Please see previous thread discussions on the excellent Intel server 8 layer stack-up and why it works so well, as well as discussions on cavity resonance. Steve. At 10:16 AM 3/11/2005 -0800, Ivor Bowden wrote: >I should have mentioned, there is ground flood on all unused areas of >all signal and component layers, to help make up for there being only >one ground plane. >Ivor > >on 3/11/2005 9:46 AM Ivor Bowden wrote: > > >Hi SI Gurus, > > > >I am working on a 10 layer board, stackup is: > > > >1 component/signal > >2 ground > >3 signal > >4 power > >5 signal > >6 signal > >7 power > >8 signal > >9 power > >10 component/signal > > > >The technology is mixed, mostly 1 to 3 V logic levels plus some LVDS and > >a little analog. > > > >The power layers are all fairly well bypassed, across the board. > > > >There are also a number of local power planes embedded in the signal planes. > > > >The issue is, one local power net, with relatively heavy supply > >requirements, is currently implemented with 3 plane areas on 3 separate > >signal layers, stitched together with vias. I am thinking it would be > >better to split the power plane on layer 9 to give this supply its own > >dedicated plane area, as layer 9 does not deliver in that area. The > >concern is signals crossing the plane split, but since there are no > >signals on layer 10 in that area, and layer 7 is a well bypassed power > >plane, it shouldn't hurt to split layer 9? > > > >I know each design is unique and requires its own proper study, but if > >anyone would share their general impressions of this scenario, I would > >appreciate it! > > > >Thanks, > > > >Ivor Bowden > >------------------------------------------------------------------ > >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 FAQ wiki page is located at: > > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > > >List technical documents are available at: > > http://www.si-list.org > > > >List archives are viewable at: > > //www.freelists.org/archives/si-list > >or at our remote archives: > > http://groups.yahoo.com/group/si-list/messages > >Old (prior to June 6, 2001) list archives are viewable at: > > http://www.qsl.net/wb6tpu > > > > > > > > > > > > >------------------------------------------------------------------ >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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > >List technical documents are available at: > http://www.si-list.org > >List archives are viewable at: > //www.freelists.org/archives/si-list >or at our remote archives: > http://groups.yahoo.com/group/si-list/messages >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > The weirsp@xxxxxxxxxx e-mail address will terminate March 31, 2005. Please update your address book with weirsi@xxxxxxxxxx ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu