Date: Thu, 08 Jun 2006 10:42:17 +0530 From: Mona <monika.talwar@nsysinc.com> To: t10@t10.org Subject: SAS Transport layer- ST_IFR/ST_ITS State machines X-Message-Number: 6937 Formatted message: HTML-formatted message Hello !! Could anybody please clear my doubts in SAS transport layer!! <>I have some doubts . I am referring SAS Revision 3a, released on 22 April 2006 <>Following are the queries : 1.In the ST_IFR state machine it has been stated on page 383(section 9.2.6.2.2.2)that "If the ST_ITS state machine for the tag specified in the Send Task Management Request is currently in use,then this state machine shall set the retransmit bit argument to one. If the ST_ITS state machine for the tag specified in the Send Task Management Request is not currently in use, then this state machine shall set the Retransmit Bit argument to zero." I am not able to figure out which scenario is being talked out here. As per my understanding, ST_ITS state-machine is busy when ST_IFR assigns it any task. After ST_ITS state machine sends Transmission status(nak or ack/nak time-out etc) to ST_IFR state machine, the ST_ITS state machine corresponding to that tag becomes free. Moreover, Is there any static binding b/w ST_ITS state machine and TAG, or that ST_IFR can allocate any state-machine when TASK/COMMAND request arrives? I am concerned if I have missed something. 2.Is CDB field's contents are visible to transport layer? If no then how does Transport layer comes to know whether the COMMAND is a read command or write command. If Yes, then why does data size need to be specified exclusively in the Execute Command request from Application layer when TRANSFER LENGTH/PARAMETER LIST LENGTH/ALLOCATION LENGTH are there in CDB to specify the size of the data. -- ---------------------------------- Best regards Mona nSys http://www.nsysinc.com Accelerating designs +1-510-402-4544 ---------------------------------- -- ---------------------------------- Best regards Mona nSys http://www.nsysinc.com Accelerating designs +1-510-402-4544 ----------------------------------