[T10] A question about the condition of Transition SP15,

[Tim Symons]

When in SP15: SAS_PHY_Ready state and optical mode is enabled



If:

1.       a phy has transmitted a Start DWS message; and

2.       afterward it receives a COMINIT Detected message,



then the state will transition to the  SP0:OOB_COMINIT state.



This state does not send a DWS Reset Message, but if it receives one then that would also cause a transition to SP0:OOB_COMINIT.





I hope this helps to clarify the rules of the state machine.

Tim Symons.



-------- Forwarded Message --------

Subject:        [T10] A question about the condition of Transition SP15,

hope

to receive your reply. Thankyou.

Date:   Sun, 4 Sep 2016 11:10:11 +0000

From:   Guojian (F) <guojian111 at hisilicon.com>

To:     t10 at t10.org <t10 at t10.org>







Hi T10 ORG,



I have a question about the condition of *Transition SP15.*



If optical mode is enabled, and the SP state machine is in SP15 with negation speed is 3Gbps. When the other side send COMINIT using 3Gbps rate, the DWS reset message will not be generated.



Then should the SP state machine transmit from SP15 to SP0?



Hope to receive your reply! Thank you!



Guojian



Description in SAS3.0 protocol:



*5.12.4.10.2 Transition SP15:SAS_PHY_Ready to SP0:OOB_COMINIT*



If optical mode is enabled or D.C. mode is enabled, then this transition shall occur after receiving:



a) a DWS Lost message, if this state does not send a Start DWS message;



b) a DWS Lost message followed by a COMINIT Detected message, if this state does not send a Start



DWS message; or



c) a DWS Reset message.



If optical mode is enabled, then this transition shall not occur after receiving a COMINIT Detected message:



a) before receiving a DWS Lost message; or



b) after sending a Start DWS message.




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