Proposal for additional 6G SAS Phy spec

Alvin.Cox at Alvin.Cox at
Mon Apr 16 11:00:04 PDT 2007

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This is exactly the type of discussion we need at the meeting. It will be 
included along with any other issues that people can find with the 
Alvin Cox
Seagate Technology, LLC
Tel 405-350-7424
Cell 405-206-4809
E-Mail	alvin.cox at
"Jenkins, Mike" <Mike.Jenkins at> 
Sent by: owner-t10 at
No Phone Info Available
04/16/2007 11:55 AM
<t10 at>
Proposal for additional 6G SAS Phy spec
Alvin & the SAS Phy folks,
I would like to revive the proposal for a minimum spec on the TX VMA.  I 
believe Kevin originally proposed this, and now, especially in the absence 
of a normative spec on de-emphasis, I believe nothing formally limits the 
minimum VMA.  The current proposal sets max/min limits on the peak 
voltage, but not on VMA which is arguably a more relevant parameter for 
signal integrity.
Hence, I propose 600 mVppd as the minimum value for TX VMA (which is the 
same value I believe Kevin proposed originally).
This subject really doesn’t seem to have much meat for a presentation, but 
I would like to discuss this during the Phy meeting, if we can spare a 
little time.  I will try to summarize these points with a few slides and 
will upload them if anyone requests.

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