It is all depends on the stack-up, diff. pair track/gap spacing and length they run in parallel to each other on the layout. Regards, M. Semic -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Mohanty, Sarada Sent: 22 February 2013 11:32 To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] PCIe Spacing between Tx or Rx Diff pair. Hi All, Could anyone tell me what the spacing we need maintain between diff pairs(TX & RX) for PCIe2 Gen 2. As per below snapshot, it will be 4x the trace width .If my understanding is wrong ,please correct me. [cid:image002.jpg@01CE111E.4F804320] Regards, Sarada ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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