[T10] Clarification requested for coefficient setting in normal TTIU after error response TTIU

Tim.Symons at microchip.com Tim.Symons at microchip.com
Thu Jul 8 16:51:53 PDT 2021


Lana,
An error response indicates that the TTIU was corrupted and the PHY could not decode it.
The TTIU should be retransmitted with the same (NORMAL) request again with the because the training change has NOT been made.

Regards
Tim.

From: Lana Chan <lana at cadence.com>
Sent: Wednesday, June 16, 2021 6:14 PM
To: t10 at t10.org; Tim Symons - C33374 <Tim.Symons at microchip.com>
Subject: Clarification requested for coefficient setting in normal TTIU after error response TTIU

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Hello,
Can you please provide clarification for the following scenario:
Assuming target agent builds the Error Response TTIU with coefficient setting = NORMAL and transmitted Error Response TTIU. Now, after that only Pattern Type, Train Comp, Tx Init and Coefficient 1/2/3 status fields has changed in the next TTIU packet. [Reference - spl4r11 section 5.18.4.4.4 Error message handling page number ]

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Our assumption is for next TTIU packet, coefficient setting should not be changed and remain same. In this case it should be NORMAL for next TTIU packet.

Our understanding is right or not? Please let us know what value should be set in the coefficient setting for next TTIU packet, after the Error response TTIU?

Regards
Lana

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