On 9/7/2014 8:49 PM, leeritchey@xxxxxxxxxxxxx<mailto:leeritchey@xxxxxxxxxxxxx> wrote: > All of the things proposed don't seem to have any basis. I, on the > other hand, have built test boards to find out. My findings are > available in my classes and do not show such vias have any value. > Hi Lee, Our simulation results suggest that, while these stitching vias have no discernable effect on signal integrity at the receiver at these speeds, they do noticeably affect electromagnetic emissions from the PCB edges, potentially threatening electromagnetic compliance testing failure, when they are omitted. And I was wondering if you have any experimental findings, in this regard, that you can share. Thanks! David Banas Sr. Member of the Technical Staff Altera Corp.<http://www.altera.com/> ________________________________ Confidentiality Notice. This message may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient, you are hereby notified that any use, disclosure, dissemination, distribution, or copying of this message, or any attachments, is strictly prohibited. If you have received this message in error, please advise the sender by reply e-mail, and delete the message and any attachments. Thank you. ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list 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