SAS revision 4 errata

Jim.Coomes at Jim.Coomes at
Mon Jun 23 14:40:27 PDT 2003

* From the T10 Reflector (t10 at, posted by:
* Jim.Coomes at

You are right. I missed the SP1 State.

The corrected fix to the problem I raised is just an editorial change.

The fix is as Mark's suggestion:

Change: transition

To: Transition SP2:OOB_NoCOMSASTimeout to SP4:OOB_COMSAS


----- Forwarded by Jim Coomes/Seagate on 06/23/03 04:27 PM -----
                      "Elliott, Robert                                                                                                 
                      (Server Storage)"        To:       <Jim.Coomes at>, <t10 at>                                       
                      <Elliott at>         cc:                                                                                     
                      Sent by:                 Subject:  RE: SAS revision 4 errata                                                     
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                      06/23/03 03:28 PM                                                                                                

* From the T10 Reflector (t10 at, posted by:
* "Elliott, Robert (Server Storage)" <Elliott at>
> -----Original Message-----
> From: Jim.Coomes at [mailto:Jim.Coomes at]
> Sent: Friday, June 20, 2003 2:02 PM
> To: Elliott, Robert (Server Storage); t10 at
> Subject: SAS revision 4 errata
> Rob,
> If there is a rev to SAS, here is another error:
> Conflict text to figure:
> doc page 122, Section Transition SP2:OOB_NoCOMSATimeout to
> states "This transition shall occur after receiving a COMINIT Detected
> message."
> doc page 121 Figure 67 shows the SP2:OOB_NoCOMSASTimeout
> state tranitioning
> to SP4 (rather than SP3) when COMINIT Detected message is received.
> Problem:
> Note: This is not the case illustrated in figure 66. In that case the
> timeout occurred on COMINIT. Here the timeout is on COMSAS.
> A transition to  SP3:OOB_AwaitCOMINIT_Sent will result in a hang as
> Transmit COMINIT only occurs in SP0: COMINIT and a COMINIT Transmitted
> confirmation is need to exit SP3:OOB_AwaitCOMINIT_Sent.
> A transition to SP4:OOB_COMSAS is a problem for the attached
> phy. It may
> have completed a Hot-plug timeout and transitioned to
> SP0: COMINIT. A COMINIT Detected confirmation is required to
> exit the SP0.

There's one other exit arc in the bottom left you might have missed.
COMINIT Transmitted causes a transition from SP0 into SP1.  SP1
looks for both COMSAS Detected and COMINIT Detected.

> Suggested Fix:
> Change to:
> "Transition SP2:OOB_NoCOMSATimeout to SP0:OOB_COMINIT"
> Change figure to reflect this change:
> Delete arrow SP2 to SP4,
> Add arrow SP2 to SP0 with COMINIT Detected.

I agree with Mark's suggestion - only the typo from SP3 to SP4
needs to change.

> Jim

Rob Elliott, elliott at
Hewlett-Packard Industry Standard Server Storage Advanced Technology

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