[SI-LIST] Re: PCI-Express Clarifications.

The PCI Express spec is governed by the PCI-SIG.  The PCI-SIG has 
made a PCI Express Jitter subgroup.  This group has just finished 
defining the Clock jitter measurement models and techniques.  They 
are now working on the data jitter.  I have been told (by several 
members outside our company and Mike Li who is co-chair of this 
group) that there will be significant changes to what is currently in 
the spec.  They are chartered to finish this work soon (1 to 2 
months).  So, stay tuned.

As for the current spec, there is a TX and RX spec for jitter and 
other parameters.  The TX is at the transmitter pins (or as close to 
them as possible).  The RX is at the reciever pins (or as close to 
them as possible).  You can go to this link to see our automated 
solution for testing PCI Express to compliance for all signal 
integrity parameters.

http://www.wavecrest.com/market_applications/pciexpress.htm

Good luck,
Craig Emmerich
Wavecrest Corp.


--- In si-list@xxxxxxxxxxxxxxx, "Rahul R" <ping_rahul@xxxx> wrote:
> Hi Experts,
> I need some clarification on the PCI-E Card Electo Mechanical Spec 
about the eye diagram measurements for the cases of system board as 
well as the Addin card acting as a receiver. The spec says they need 
to be measured into a 100 ohm diff load but where exactly do the 
measurements need to be taken. Also, what is the use of the AC 
coupling caps in addition to blocking the DC path  between the addin 
card and the board. 
> 
> 
> Thanks,
> Rahul.
> 
> 
> 
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