Reminder, SAS PHY WG call, June 12, 10:00am CDT

Bent Hessen-Schmidt bhessen at SynthesysResearch.com
Fri Jun 13 09:25:56 PDT 2008


Formatted message: <A HREF="r0806131_f.htm">HTML-formatted message</A>

Hi Guillaume,
The 97 kHz limit with associated SJ amplitude of 45.3 UI is a standard
built-in capability in most BERTs. The 240 kHz limit of 7.4 UI (1,233
ps) at 6 Gb/s exceed the limit of some older equipment by merely 10%.
Although we do not mind having upgrade business, it is less desirable
|from a users point of view and could easily be mitigated by using 270
kHz as the test point. Further SSC waveforms have energy at 270 kHz (odd
harmonic) and much less so at 240 kHz (even harmonic, which ideally
should have zero energy).   
Sincerely,
Bent Hessen-Schmidt
SyntheSys Research, Inc.
3475-D Edison Way
Menlo Park, CA 94025
(650) 364-1853
www.BERTScope.com
________________________________
From: Guillaume Fortin (Montreal)
[mailto:Guillaume_Fortin at pmc-sierra.com] 
Sent: Thursday, June 12, 2008 7:11 PM
To: Bent Hessen-Schmidt; Alvin.Cox at seagate.com; t10 at t10.org
Subject: RE: Reminder, SAS PHY WG call, June 12, 10:00am CDT
Hi Bent,
The 240kHz was picked up by Mike in his original proposal for the 1/JTF
mask. It was the same limit as what we would have by extending the
SAS-1.1 mask to 6G and it also gave an SJ amplitude that seemed to be in
the within the SJ generation capabilities of BERT testers.
What is your take on the feasibility of setting a 97kHz limit for the SJ
mask, with an associated SJ amplitude of 45.3UI? Will most test
equipment meet this SJ generation requirement?
Thanks,
Guillaume
________________________________
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Bent
Hessen-Schmidt
Sent: Thursday, June 12, 2008 12:31 AM
To: Alvin.Cox at seagate.com; t10 at t10.org
Subject: RE: Reminder, SAS PHY WG call, June 12, 10:00am CDT
Hi Alvin, Guilllaume and fellow SAS workgroup members,
I am unable to join the call tomorrow morning, but like to submit the
following comments:
I like Guillaume's presentation on inverse JTF. I suggest picking values
for 270 kHz instead of 240 kHz on slides 10, 21 and 22 as 240 kHz is an
even harmonic and the SSC waveform generally have more energy at odd
harmonics. This will also have the points on the line spaced more
evenly. Further there is indeed test equipment available which include
all of the 3 functions at the far left of slide 16 in one instrument
plus programmable de-emphasis as an additional option (several of the
other member on the call already have this equipment). 
Sincerely,
Bent Hessen-Schmidt
SyntheSys Research, Inc.
3475-D Edison Way
Menlo Park, CA 94025
(650) 364-1853
www.BERTScope.com
________________________________
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of
Alvin.Cox at seagate.com
Sent: Wednesday, June 11, 2008 7:28 AM
To: t10 at t10.org
Subject: Reminder, SAS PHY WG call, June 12, 10:00am CDT
Toll Free Dial in Number: (877)810-9442 
International Access/Caller Paid Dial In Number: (636)651-3190 
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Webex information: 
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Topic: SAS-2 PHY WG 
Date: Thursday 
Time: 10:00 am, Central Daylight Time 
Meeting number: 826 515 680 
Meeting password: 6gbpsSAS 
Agenda: 
1. Letter ballot comment resolution status [Elliott] 
2. External mini-SAS Cable keying 
3. Update on receiver testing. [Witt, Newman] 
	Comments on reverse JTF?
http://www.t10.org/ftp/t10/document.08/08-248r0.pdf
<http://www.t10.org/ftp/t10/document.08/08-248r0.pdf&gt;  
Alvin Cox
Seagate Technology, LLC
Cell 405-206-4809
E-Mail	alvin.cox at seagate.com



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