Hi all, I'm working on a PCI-E board for quite a while now, and I'm trying to figure something out here, regarding the clock scheme of the PCI-E. I've looked through the spec. of PCI-E and from wondering around the net i found a few things that don't match up: 1. I understand that the transmission rate is 250 MB/S/lane, hence, if I have x16link, then the tx rate will be 4GB/S/lane, BUT, i've read in few places (including the Spec.) that the idea in PCI-E is that one does not transmit clock, but rather 8b10b encoded data, and from this the other end re-create the recieve clock. how does that settle? 2. also, there's a 100MHz clock which is called a reference clock, that IS transmitted... how does that settle with remark 1) ? 3. furthermore, what is the 2.5Gb/s tx rate, which ussually, when people talk about PCI-E, they through it in the air...? 2.5Gb/s is not 250MB/s/lane... if anyone will be able to explain all that to me ,it will be great, cause i'm all messed up around here... Thanks guys and girls! Roy ------------------------------------------------------------------ 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