Ivor, Is layer 7 a split plane? Qazi Iqbal -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ivor Bowden Sent: Friday, March 11, 2005 11:17 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Splitting this power plane. 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 -- PRIVACY WARNING: For auditing purposes, a copy of this message has been saved in a permanent database. -- PRIVACY WARNING: For auditing purposes, a copy of this message has been saved in a permanent database. ------------------------------------------------------------------ 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