Subbu, it means the design is severely flawed. Steve. At 06:44 AM 4/19/2006, Subramanian R wrote: >Hi Steve, >Balaji, that dog won't hunt. > >Sorry, i didn't get u. wht was ur meaning?? > >Regards >Subbu > >On 4/18/06, steve weir <weirsi@xxxxxxxxxx> wrote: > > > > Balaji, that dog won't hunt. > > > > > > Steve. > > At 07:48 AM 4/18/2006, Balaji S wrote: > > >Hello All, > > >I have a couple of queries: > > >I have a stack-up as given below > > > > > >--------TOP > > >--------S1 > > >--------VCC > > >--------GND > > >--------S2 > > >--------BOTTOM > > > > > >All high speed signals (SDRAM - 133MHz) are routed on S1.I have copper > > >pour on TOP and > > >BOTTOM layers. The component density is High on both the outer layers, > > >hence a solid plane is not obtained. > > > > > >1. For controlled impedance calculations, do i consider the traces on S2 > > >as striplines or Micro-strip lines? > > >2. Our Fabricator told us that, when doing the impedance measurement on > > >coupons, he will > > > be considering GND and BOTTOM layers as solid planes. Will not the > > >result be different in the actual board, > > > since the Copper on BOTTOM layer is not completely solid? > > > > > >Thank you > > > > > >With Regards > > >Balaji S > > > > > >------------------------------------------------------------------ > > >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 > > > > > > > >------------------------------------------------------------------ >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