SAS word sync.

Elliott, Robert (Server Storage) Elliott at hp.com
Mon Mar 3 11:35:46 PST 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
SAS phys sends data dwords, not primitives (aka ordered sets), when
idle.  Fibre Channel uses IDLE primitives when it's idle.  Thus, three
consecutive primitives are not as likely to show up in SAS.

--
Rob Elliott, elliott at hp.com
Hewlett-Packard Industry Standard Server Storage Advanced Technology
https://ecardfile.com/id/RobElliott




> -----Original Message-----
> From: Seto, Pak-lung [mailto:pak-lung.seto at intel.com] 
> Sent: Monday, March 03, 2003 11:39 AM
> To: 't10 at t10.org'
> Subject: SAS word sync.
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * "Seto, Pak-lung" <pak-lung.seto at intel.com>
> *
> Need clarification on SAS dword synchronization.
> 
> In the SAS doc 3d, clause 6.8 SP_DWS, Fig 63 SP_DWS state machine.
> 
> According to the state machine, it does not require to detect 
> 3 "consecutive" primitives to declare dword synchronization.  
> It allows normal valid dword in between the 3 primitives and 
> still can claim dword synchronization which is not the same 
> as Fibre Channel.  Fibre Channel requires 3 consecutive 
> primiitves to be detected.  Is it what SAS want to have word 
> sync different from Fibre Channel?  If the answer is yes, is 
> there any reason why?
> 
> Pak
> 
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