[T10] Clarification requested for the detection of END_TRAIN in Train-TX Speed Negotiation Window

[Lana Chan]

Hello,
I am seeking clarification regarding END_TRAIN in Train-Tx Speed Negotiation Window in the Physical Layer in which the  Train-Tx comprises of the exchange of Transmitter Training Pattern between two SAS devices.

Per the Working Draft SAS Protocol Layer - 4 (spl4r11), Section - 5.11.4.2.3.4.2 Transmitter training,  the transmitter training pattern comprises of the following

[cid:image001.jpg at 01D7426C.50B1CDD0]

Can you please provide clarification for the following scenario:

  1.  Receiver does detect the END_TRAIN and TTIU received is considered as valid.
  2.  Receiver does not detect the END_TRAIN and still considered the received TTIU.
  3.  Receiver does not detect the END_TRAIN and discarded the received TTIU.

As per our understanding receiver discarded the TTIU, If END_TRAIN is not detected (point-3). We are not agreeing to point-2. Please let us know which scenario is valid.

Kind regards
Lana

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.t10.org/pipermail/t10/attachments/20210506/d73d300b/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 17139 bytes
Desc: image001.jpg
URL: <https://www.t10.org/pipermail/t10/attachments/20210506/d73d300b/attachment.jpg>