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.
Regards,
John
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 observations:
- 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
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