Question about SAS Wide ports & first burst data

Mignon Fernandez Mignon.M.Fernandez at bitmicro.com
Tue Feb 2 18:15:09 PST 2010


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1002021_f.htm">HTML-formatted message</a>

Hello,
Regarding Wide Ports, is it possible for the initiator to transmit the
first burst data using a different phy from the phy used in transmitting
the command?
Please refer to the diagram below (both connections are open).
Target Wide Port
Initiator Wide Port
+-----------------+			  +-----------------+
|		  |			  |		    |
|  +-----------+  |			  |  +-----------+  |
|  |	       |<-+-------WRITE CMD0------+--|		 |  |
|  |	       |  | (first burst enabled) |  |		 |  |
|  |   PHY A   |  |			  |  |	 PHY A	 |  |
|  |	       |--+----------ACK----------+->|		 |  |
|  |	       |  |			  |  |		 |  |
|  +-----------+  |			  |  +-----------+  |
|		  |			  |		    |
|  +-----------+  |			  |  +-----------+  |
|  |	       |<-+------WRITE DATA-------+--|		 |  |
|  |   PHY B   |  | (first burst data of  |  |	 PHY B	 |  |
|  |	       |  |	    CMD0)	  |  |		 |  |
|  +-----------+  |			  |  +-----------+  |	  
|		  |			  |		    |
+-----------------+			  +-----------------+
Thanks!
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