UAS Draft

John Lohmeyer lohmeyer at
Wed Feb 13 10:14:54 PST 2008

Formatted message: <A HREF="r0802135_f.htm">HTML-formatted message</A>

Hello Yoni,
You have raised valid points. I think it is important for the UAS project
that an appropriate liaison activity be established with the appropriate USB
group or groups.
I would caution people to not read too much into UAS rev 0. Curtis Stevens
posted this draft as a straw man for review by the UAS working group last
week. It has received no review (yet) by CAP nor T10. I have added it to the
March 12-13 CAP agenda.
At 2/13/2008 08:59 AM, Yoni Shternhell wrote:
>Hello all,
>Upon first review of the UAS draft (T10/2095-D) one cannot escape several
>    * Even though one of the triggers leading to this (UAS) project was the
introduction of USB 3.0 (see T10/07-400r1), the initial draft carefully
avoids any direct mention or reference to it. While this approach might be
considered as a valid workaround avoiding the need to execute the USB 3.0
Contributors Agreement required by the USB  3.0 Promoters Group in order to
gain access to the evolving USB 3.0 draft specifications,  it does not make
any technical sense: one does not have to be a USB 3.0 Contributor to
understand that USB 3.0 will be significantly different from USB 2.0, 
therefore, in order for UAS to be compatible or at least non-conflicting with
 USB 3.0, the UAS specification must reference the USB 3.0 specification. 
>    * One of the key promises of UAS (according to the initial draft) is:
does not interfere with the USB Mass Storage Class (MSC) bulk-only
transport). This is a non-trivial promise, deserving significant attention;
therefore I suggest including in the UAS document a dedicated chapter about
the envisioned coexistence/non-interference/inter-operability between a
device and host, taking into considerations all the valid/envisioned
configuration combinations on both the host and device side (UAS enabled vs.
classicalUSB host protocol stack or both). This suggested new chapter in the
UAS spec, IMHO, must be discussed and agreed upon even before further
embarking into the bits and pieces of the UAS protocol details.  Furthermore,
this chapter must be cooperatively coordinated with both USB IF and the USB
3.0 Promoter Group in order to ensure fulfillment of the above cited promise. >
>Yoni Shternhell | Standardization Engineer- CTO Office | SanDisk | o.
+972.(0)9.7632594 m. +972.(0)54.9222041| f. +972.(0)3.548-8666|
John Lohmeyer		       Email: lohmeyer at
LSI Corp.		       Voice: +1-719-533-7560
4420 ArrowsWest Dr.		Cell: +1-719-338-1642
Colo Spgs, CO 80907

More information about the T10 mailing list