User manual MAXTOR SERIAL ATTACHED SCSI

[. . . ] Users Guide Serial Attached SCSI (SAS) Interface Manual Users Guide Serial Attached SCSI (SAS) Interface Manual ©2003, 2004, 2005, 2006 Seagate Technology LLC All rights reserved Publication number: 100293071, Rev. B May 2006 Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology LLC. SeaTools, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either registered trademarks or trademarks of Seagate Technology LLC. Other product names are registered trademarks or trademarks of their owners. [. . . ] Primitive sequences Number of times to transmit 1 2 3 6 Number of times received to detect 1 1 3 3 Primitive sequence type Single Repeated Triple Redundant Any number of ALIGNs and NOTIFYs may be sent inside primitive sequences without affecting the count or breaking the consecutiveness requirements. Rate matching ALIGNs and NOTIFYs shall be sent inside primitive sequences inside of connections if rate matching is enabled (see 4. 9. 2). 4. 2. 4. 2 Single primitive sequence Primitives labeled as single primitive sequences are sent one time. 4. 2. 4. 3 Triple primitive sequence Primitives that form triple primitive sequences (e. g. , CLOSE (NORMAL)) are sent three times consecutively. ALIGNs and NOTIFYs may be sent inside primitive sequences as described in 4. 2. 4. 1. Serial Attached SCSI (SAS) Interface Manual, Rev. B 57 Receivers detect a triple primitive sequence after the identical primitive is received in three consecutive dwords. After receiving a triple primitive sequence, a receiver is not detect a second instance of the same triple primitive sequence until it has received three consecutive dwords that are not any of the following: a. Figure 22 shows examples of triple primitive sequences. Tim e Triple prim itive sequenc e A Triple prim itive s equenc e A Triple prim itive s equence A idle dword idle dword idle dword idle dword idle dword idle dword Triple A Triple A Triple A Triple A Triple A Triple A Triple A Triple A Rec eiver detec ts Triple prim itive sequenc e A Triple prim itive sequenc e B Triple prim itive sequenc e A Rec eiver detects Tim e Triple prim itive sequenc e B Triple A Receiver detects Triple B Rec eiver detec ts A LIGN A LIGN A LIGN A LIGN A LIGN A LIGN Triple A Triple A Triple A Triple B Triple B Triple B Triple A Triple A Triple A Triple A Triple A Triple A Triple A A LIGN Triple B Rec eiver detec ts Rec eiver detec ts Rec eiver detec ts Figure 22. Triple primitive sequence 4. 2. 4. 4 Redundant primitive sequence Primitives that form redundant primitive sequences (e. g. , BROADCAST (CHANGE)) are sent six times consecutively. ALIGNs and NOTIFYs may be sent inside primitive sequences as described in 4. 2. 4. 1. A receiver detects a redundant primitive sequence after the identical primitive is received in any three of six consecutive dwords. After receiving a redundant primitive sequence, a receiver does not detect a second instance of the same redundant primitive sequence until it has received six consecutive dwords that are not any of the following: a. an ALIGN or NOTIFY. 58 Serial Attached SCSI (SAS) Interface Manual, Rev. B Triple B A LIGN A LIGN A LIGN A LIGN A LIGN A LIGN Redundant A Redundant A Redundant A Redundant A Rec eiver detects Redundant A Redundant A Redundant A Redundant A Redundant A Redundant A Redundant B Redundant B Redundant B Redundant B Redundant B Redundant B Redundant A Redundant A Redundant A Redundant A Rec eiver detec ts Redundant A Redundant A Redundant A Redundant A idle dword idle dword idle dword idle dword idle dword idle dword Tim e Redundant A A LIGN Redundant A A LIGN Redundant A A LIGN Rec eiver detects Redundant A A LIGN Redundant A A LIGN Redundant A Redundant prim itive s equence A Redundant prim itive sequenc e A Redundant A Rec eiver detects Redundant A Redundant prim itive s equence A Redundant prim itive s equence A Redundant A Figure 23. Redundant primitive sequence Redundant A Serial Attached SCSI (SAS) Interface Manual, Rev. B Tim e Redundant prim itive sequenc e B Rec eiver detec ts Figure 23 shows examples of redundant primitive sequences. 59 4. 2. 5 4. 2. 5. 1 Primitives not specific to type of connections AIP (Arbitration in progress) AIP is sent by an expander device after a connection request to indicate that the connection request is being processed and indicate the status of the connection request. The versions of AIP representing different statuses are defined in table 20. Primitive AIP (NORMAL) AIP (RESERVED 0) AIP (RESERVED 1) AIP (RESERVED 2) AIP (WAITING ON CONNECTION) AIP (WAITING ON DEVICE) AIP (WAITING ON PARTIAL) AIP (RESERVED WAITING ON PARTIAL) AIP primitives Description Expander device has just accepted the connection request. Expander device has determined the routing for the connection request, but the destination phys are all being used for connections. Expander device has determined the routing for the connection request and forwarded it to the output physical link. Expander device has determined the routing for the connection request, but the destination phys are all busy with other partial pathways (i. e. , connection requests that have not reached the destination phy). Processed the same as AIP (WAITING ON PARTIAL). See 4. 9. 1 for details on connections. [. . . ] Parameter control bits for SAS log parameters Value for LOG SENSE 0 0 0 0 0 1 1 Bit Value for LOG SELECT 0 or 1 0 or 1 0 or 1 0 or 1 any 1 1 Description DU DS TSD ETC TMC LBIN LP The value is provided by the device server. The device server supports saving of the parameter. The device server manages saving of the parameter. No threshold comparison is made on this value. [. . . ]