[SI-LIST] Fw: PCIe 3.0 Clock Jitter Tool
- From: Joseph.Schachner@xxxxxxxxxxxxxxxxxx
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 11 Feb 2015 09:45:15 -0500
Hi, Nagar.
The previous answer (that you need to be a member of PCI SIG to get the
Clock tool) is correct.
By the way, it is not the "PCIE 3.0 Clock Jitter Compliance Measurement
Tool". What the web site page about testing tools says about it is:
(FYI Only) PCI Express Clock Phase Jitter Test Software: ClockTool version
1.3:
Software package that analyzes captured reference clock data to PCI
Express 1.1 CEM specification or the PCI Express Base 2.0 specification.
Software runs on Windows XP*
The text above is from the PCIe 1.1 section. Below is text from the PCIe
2.0 section:
PCI Express Clock Phase Jitter Test Software: ClockTool version 1.3.
Same as for PCI Express 1.1a
This tool is not referred to in the PCIe Gen3 section of that web page.
Since you thought this was a "PCIE 3.0 ... Compliance Measurement Tool", I
just want to add a few words about what PCIe TX compliance testing really
is. If you are building a system board (or root complex on something)
sure, you want to test the clock. However, at PCI compliance workshops we
stopped running the clock signal through the intel Clock Jitter tool I
think back at Gen 2, and we certainly don't do it for Gen 3. For Gen2 and
Gen3 the Test spec mandates that we acquire the clock and the data signal
simultaneously, and SigTest measures jitter on the data signal relative to
the simultaneously acquired clock signal. See any company's MOI or the
test spec itself, you'll see that.
The reason for this change from PCIe 1.1 should be obvious. Jitter on the
data and jitter on the clock could both be "in spec" magnitudes, but if
the phase of the jitter was not tightly correlated the data relative to
clock jitter could be higher than either, instead of less (as you would
expect if they moved together). It is from experience gained during PCIe
1.1 testing that the CEM group realized they needed to change the
methodology to measure data to clock jitter, because that is what matters
- that is what the receiver may need to deal with.
I hope this is interesting. If you are working with PCIe I encourage you
to join the PCI SIG. You would get access to all the specs, all the
approved MOIs, all the test tools, and you would be able to listen in to
work group meetings, if you want to.
-- Joseph Schachner
Senior Software Engineer
Teledyne LeCroy
From: "nagar ashish" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender
"ashish_nagar1@xxxxxxxxx" for DMARC)
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>,
Date: 02/10/2015 11:24 PM
Subject: [SI-LIST] PCIe 3.0 Clock Jitter Tool
Sent by: si-list-bounce@xxxxxxxxxxxxx
I am looking for PCIe 3.0 Clock Jitter Compliance measurement  tool. Read
about many are using Intel Clock Jitter Tool for the same purpose. Need
help to find how to procure the tool, tried PCI-SIG, intel, doing google
also.....but no luck so far.
Anyone used the tool ? How to procure the tool ? and is that the standared
compliance tool for PCIe 3 Clock Jitter ??
Ashish
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