Seagate ST31051, Product Manual

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Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E vii
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Table of contents
3.2 SCSI bus conditions ...................................................................................................... 20
3.2.1
Attention conditions (see Unit Attention Condition, 4.6) .................................... 20
3.2.2 Reset condition ................................................................................................ 21
3.2.3 Contingent Allegiance condition ....................................................................... 21
3.3 SCSI bus phase sequences .......................................................................................... 21
3.3.1
Nonarbitrating system ...................................................................................... 21
3.3.2 Arbitrating systems .......................................................................................... 21
3.3.3 All systems ....................................................................................................... 22
3.4 SCSI pointers ................................................................................................................ 23
3.4.1
Current pointers ............................................................................................... 24
3.4.2 Saved pointers ................................................................................................. 24
3.5 Message system specification ...................................................................................... 24
3.5.1
General message protocol ............................................................................... 25
3.5.2 Messages - general ......................................................................................... 25
3.5.3 Message details ............................................................................................... 27
3.5.3.1 One and Two Byte message ............................................................ 27
3.5.3.2 Extended message ....................................................... (01h) ......... 35
4.0 SCSI commands ...................................................................................................................... 42
4.1
Command implementation requirements ...................................................................... 42
4.1.1
Reserved ......................................................................................................... 42
4.2 Command descriptor block (CDB) ................................................................................ 42
4.2.1
Operation code ................................................................................................ 43
4.2.2 Logical Unit Number (LUN) .............................................................................. 44
4.2.3 Logical Block Address ...................................................................................... 45
4.2.4 Relative Address Bit ......................................................................................... 45
4.2.5 Transfer Length ................................................................................................ 45
4.2.6 Control Byte ..................................................................................................... 46
4.3 Status ........................................................................................................................... 46
4.4 Command examples ..................................................................................................... 48
4.4.1
Single Command example ............................................................................... 48
4.4.2 Disconnect example ......................................................................................... 50
4.5 Timing examples ........................................................................................................... 52
4.6 Unit attention condition .................................................................................................. 67
4.7 Queued I/O processes .................................................................................................. 68
4.7.1
Untagged queuing ............................................................................................ 68
4.7.2 Tagged queuing ............................................................................................... 68
4.8 Parameter Rounding ..................................................................................................... 70
4.9 Command Processing considerations and exception conditions ................................... 70
4.9.1
Programmable Operating definition .................................................................. 70
4.9.2 Incorrect initiator connection ............................................................................ 71
4.9.3 Selection of an Invalid Logical unit ................................................................... 71
5.0 Command descriptions ........................................................................................................... 72
5.1
Command descriptions for all device types ................................................................... 72
5.1.1
Group 0 commands for all device types ........................................................... 72
5.1.1.1 Test Unit Ready ............................................................. (0h) ........... 72
5.1.1.2 Request Sense command ............................................. (03h) ......... 73
5.1.1.2.1 Deferred errors ................................................................. 81
5.1.1.3 Inquiry command .......................................................... (12h) ......... 82
5.1.1.3.1 Vital product data pages ................................................... 86
5.1.1.4 Copy command ............................................................. (18h) ......... 95
5.1.1.5 Receive Diagnostic results command ........................... (1Ch) ......... 95
5.1.1.6 Send Diagnostic command ........................................... (1Dh) ......... 100