question re: Training SNW

Day, Brian Brian.Day at lsi.com
Wed Nov 4 15:06:06 PST 2009


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r0911040_f.htm">HTML-formatted message</a>

Regarding Question #1 - The "Training Completed" message was intended to be
outside the scope of the standard, as that is dependent on each vendor's
technology implementation.  The main point is the receiver has completed
whatever (if any) internal adjustments it may have needed to perform on the
incoming training pattern.
Re Question #2 - Yes... it's more than okay...	it's required that the
transition take place.	 The devices at each end of the cable will often not
finish their receiver adjustments at the same time, so a device not seeing a
TRAIN pattern would be a likely scenario.
Brian Day
LSI Corporation
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Mignon
Fernandez
Sent: Thursday, October 22, 2009 12:31 AM
To: t10 at t10.org
Cc: Olive Anne P. Ochoada
Subject: question re: Training SNW
Hello,
We would like to clarify some points regarding the Training SNW.
>From page 301 of T10/1760-D Revision 16 specs:
6.8.4.12.5 Transition SP29:SAS_Train to SP30:SAS_TrainingDone
This transition shall occur if:
a) the TLT timer has not expired;
b) this state receives a Training Completed message;
c) dword synchronization is acquired; and
d) this state receives a TRAIN Received message or a TRAIN_DONE Received
message.
If a TRAIN_DONE Received message was received, then the transition shall
include a TRAIN_DONE
Received argument.
Question #1:
What conditions should be met before the SP_SM receiver sends a Training
Completed message?
Does Training Completed mean that a TRAIN_PATTERN has been received and
transmitted?
Question #2:
What happens if this scenario occurs?
à While the phy is transmitting a TRAIN_PATTERN, the receiver detects a
TRAIN_DONE pattern.
(no TRAIN_PATTERN is ever received from the attached phy). Is it OK to
transition to SAS_TrainingDone?
Or does the phy really have to wait for a TRAIN_PATTERN.
Thank you
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