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,
SyntheSys Research, Inc.
(650) 364-1853
From: Guillaume Fortin
(
Sent: Thursday, June 12, 2008 7:11
PM
To:
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@t10.org [mailto:owner-t10@t10.org] On
Behalf Of
Sent: Thursday, June 12, 2008
12:31
To: Alvin.Cox@seagate.com;
t10@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,
SyntheSys Research, Inc.
(650) 364-1853
From:
owner-t10@t10.org [mailto:owner-t10@t10.org] On
Behalf Of Alvin.Cox@seagate.com
Sent: Wednesday, June 11, 2008
7:28
To: t10@t10.org
Subject: Reminder, SAS PHY WG
call, June 12, 10:00am CDT
Toll Free Dial in Number: (877)810-9442
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Access/Caller Paid Dial In Number: (636)651-3190
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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
Alvin Cox
Seagate Technology, LLC
Cell 405-206-4809
E-Mail alvin.cox@seagate.com