[SI-LIST] Re: PCI Express lane to lane skew
- From: <vani.chandrasekharan@xxxxxxxxx>
- To: <jeff.loyer@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 4 Aug 2005 09:30:37 +0530
=0D
Hi all,
Thanks a lot for all your inputs in this regard. It was of great help.
Warm regards
Vani
-----Original Message-----
From: Loyer, Jeff [mailto:jeff.loyer@xxxxxxxxx]=0D
Sent: Wednesday, August 03, 2005 8:45 PM
To: Vani Chandrasekharan (WT01 - Software Products & OSS);
si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] PCI Express lane to lane skew
You're correct. It's the skew between the lanes of a "xN" link (where N
represents the number of lanes in that link). Trace length differences
are usually the most biggest factor in that skew, though other routing
differences (microstrip vs. stripline, etc.) can add skew.
You might also hear it referred to as "inter-pair" skew (difference in
skew between 2 differential pairs). Intra-pair skew would be the skew
between 2 halves of a differential pair.=0D
It's typically not an issue in PCI Express, since the receivers allow
such a large skew.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of vani.chandrasekharan@xxxxxxxxx
Sent: Wednesday, August 03, 2005 3:03 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] PCI Express lane to lane skew
=3D0D
Hi all,
What is meant by lane to lane skew in PCI express context. Is it the
time difference of a particular data edge transmitted simultaneously on
any 2 lanes. i.e. relating the length of traces of the 2 lanes and hence
the skew. Or is it something else?
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