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

[Tim.Symons at microchip.com]

Lana,
Thank you for your question.
This is an interesting scenario, I will need to review this will other member organizations for their opinions before responding with a recommendation.

Regards
Tim Symons
SPL-5 Editor

Tim Symons | Associate Technical Fellow
Microchip Technology Inc.
Tim.Symons at microchip.com<mailto:Tim.Symons at microchip.com>

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From: t10-bounces at t10.org <t10-bounces at t10.org> On Behalf Of Lana Chan
Sent: Thursday, May 6, 2021 11:38 AM
To: t10 at t10.org
Subject: [T10] Clarification requested for the detection of END_TRAIN in Train-TX Speed Negotiation Window

EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
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

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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

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