scsi-3协议

【实例截图】

【核心代码】

Table of contents
1.0 Interface requirements............................................................................................................ 1
1.1 How to use this interface manual.................................................................................. 1
1.2 General interface description........................................................................................ 1
1.3 Physical interface characteristics.................................................................................. 3
1.4 Summary of SCSI commands and messages .............................................................. 4
2.0 SCSI bus .................................................................................................................................. 7
2.1 SCSI bus signals .......................................................................................................... 8
2.1.1 Drive select ...................................................................................................... 9
2.1.2 Signal values ................................................................................................... 9
2.1.3 OR-Tied signals ............................................................................................... 9
2.1.4 Signal sources ................................................................................................. 9
2.2 SCSI bus timing............................................................................................................ 10
2.2.1 Arbitration delay (2.4 µs).................................................................................. 10
2.2.2 Assertion period (90 ns).................................................................................. 10
2.2.3 Bus Clear delay (800 ns) ................................................................................ 11
2.2.4 Bus Free delay (800 ns) ................................................................................. 11
2.2.5 Bus Set delay (1.8 µs) .................................................................................... 11
2.2.6 Bus Settle delay (400 ns)................................................................................ 11
2.2.7 Cable Skew delay (10 ns) ............................................................................... 11
2.2.8 Data Release delay (400 ns) ........................................................................... 11
2.2.9 Deskew delay (45 ns) ..................................................................................... 11
2.2.10 Disconnection delay (200 µs).......................................................................... 11
2.2.11 Hold time (45 ns) ............................................................................................ 11
2.2.12 Negation period (90 ns) .................................................................................. 11
2.2.13 Reset Hold time (25 µs) .................................................................................. 12
2.2.14 Selection Abort time (200 µs).......................................................................... 12
2.2.15 Selection Timeout delay (250 ms)................................................................... 12
2.2.16 Transfer Period (negotiated by SDTR message) ............................................. 12
2.3 Fast synchronous transfer option timing....................................................................... 12
2.3.1 Fast Assertion period (30 ns).......................................................................... 12
2.3.2 Fast Cable Skew delay (5 ns)......................................................................... 12
2.3.3 Fast Deskew delay (20 ns) ............................................................................. 12
2.3.4 Fast Hold time (10 ns) .................................................................................... 12
2.3.5 Fast Negation period (30 ns) .......................................................................... 12
3.0 Logical characteristics ........................................................................................................... 13
3.1 SCSI bus phases.......................................................................................................... 13
3.1.1 Bus Free phase ............................................................................................... 13
3.1.2 Arbitration phase.............................................................................................. 14
3.1.3 Selection phase ............................................................................................... 14
3.1.4 Reselection phase ........................................................................................... 16
3.1.5 Information Transfer phases ............................................................................ 17
3.1.6 Command phase ............................................................................................. 19
3.1.7 Data phase ...................................................................................................... 19
3.1.8 Status phase (see Section 4.3)........................................................................ 19
3.1.9 Message phase ............................................................................................... 20
3.1.10 Signal Restrictions Between phase ................................................................. 20
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3.2 SCSI bus conditions ..................................................................................................... 21
3.2.1 Attention conditions (see Unit Attention Condition, 4.6) ................................... 21
3.2.2 Reset condition ................................................................................................ 22
3.2.3 Contingent Allegiance condition ....................................................................... 22
3.3 SCSI bus phase sequences ......................................................................................... 22
3.3.1 Nonarbitrating system...................................................................................... 22
3.3.2 Arbitrating systems .......................................................................................... 22
3.3.3 All systems ...................................................................................................... 23
3.4 SCSI pointers ............................................................................................................... 24
3.4.1 Current pointers ............................................................................................... 25
3.4.2 Saved pointers................................................................................................. 25
3.5 Message system specification ...................................................................................... 25
3.5.1 General message protocol............................................................................... 26
3.5.2 Messages - general ......................................................................................... 26
3.5.3 Message details............................................................................................... 28
3.5.3.1 One and Two Byte message............................................................ 28
3.5.3.2 Extended message .......................................................(01h) ......... 36
3.6 Message exception conditions handling ....................................................................... 42
3.7 S.M.A.R.T. system........................................................................................................ 45
4.0 SCSI commands ...................................................................................................................... 47
4.1 Command implementation requirements ...................................................................... 47
4.1.1 Reserved ......................................................................................................... 47
4.2 Command descriptor block (CDB) ................................................................................ 47
4.2.1 Operation code ................................................................................................ 48
4.2.2 Logical Unit Number (LUN).............................................................................. 49
4.2.3 Logical Block Address...................................................................................... 50
4.2.4 Relative Address Bit......................................................................................... 50
4.2.5 Transfer Length ............................................................................................... 50
4.2.6 Control Byte ..................................................................................................... 51
4.3 Status ........................................................................................................................... 51
4.4 Command examples..................................................................................................... 53
4.4.1 Single Command example............................................................................... 53
4.4.2 Disconnect example ........................................................................................ 55
4.5 Timing examples........................................................................................................... 57
4.6 Unit attention condition ................................................................................................. 72
4.7 Queued I/O processes.................................................................................................. 73
4.7.1 Untagged queuing............................................................................................ 73
4.7.2 Tagged queuing ............................................................................................... 73
4.8 Parameter Rounding..................................................................................................... 75
4.9 Command Processing considerations and exception conditions .................................. 75
4.9.1 Programmable Operating definition ................................................................. 75
4.9.2 Incorrect initiator connection ............................................................................ 76
4.9.3 Selection of an Invalid Logical unit................................................................... 76
5.0 Command descriptions .......................................................................................................... 77
5.1 Command descriptions for all device types .................................................................. 77
5.1.1 Group 0 commands for all device types .......................................................... 77
5.1.1.1 Test Unit Ready ............................................................(00h) ......... 77
5.1.1.2 Request Sense command ............................................(03h) ......... 78
5.1.1.2.1 Deferred errors ................................................................ 86
5.1.1.3 Inquiry command ..........................................................(12h) ......... 87
5.1.1.3.1 Vital product data pages .................................................. 91
5.1.1.4 Copy command ............................................................(18h) ......... 100
5.1.1.5 Receive Diagnostic results command...........................(1Ch)......... 100
5.1.1.6 Send Diagnostic command ...........................................(1Dh)......... 105
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5.1.2 Group 1 commands for all device types ........................................................ 108
5.1.2.1 Compare command ......................................................(39h) ....... 108
5.1.2.2 Copy and verify command ............................................(3Ah) ....... 108
5.1.2.3 Write Buffer command ..............................................(3Bh) ....... 108
5.1.2.3.1 Combined Header and Data mode ...............(000b) ..... 109
5.1.2.3.2 Write Data Only mode ..................................(010b) ..... 110
5.1.2.3.3 Download Microcode mode ..........................(100b) ..... 110
5.1.2.3.4 Download and Save Microcode mode ..........(101b) ..... 110
5.1.2.3.5 Download Microcode with offsets .................(110b)...... 111
5.1.2.3.6 Download Microcode with offsets and
save mode ....................................................(111b) ...... 112
5.1.2.4 Read Buffer command ..............................................(3Ch)....... 113
5.1.2.4.1 Read Combined Descriptor Header
and Data mode .............................................(000b) ..... 113
5.1.2.4.2 Read data ...................................................................... 114
5.1.2.4.3 Read Buffer Descriptor mode .......................(011b)...... 114
5.1.3 Group 2 Commands for All Device Types ...................................................... 115
5.1.3.1 Change Definition command.........................................(40h) ....... 115
5.1.3.2 Log Select command ....................................................(4Ch)....... 117
5.1.3.2.1 Write, Read and Verify Error Counter pages
(code 02, 03, 05h) ........ 123
5.1.3.2.2 Non-Medium Error page ...............................(code 06h) 125
5.1.3.2.3 Cache Statistics page...................................(code 37h) 125
5.1.3.3 Log Sense command....................................................(4Dh)....... 126
5.1.3.4 Other Group 2 commands ............................................................. 128
5.1.4 Groups 3 through 5 commands for all device types....................................... 128
5.1.5 Group 6 commands for all device types ........................................................ 128
5.1.6 Group 7 commands for all device types ........................................................ 128
5.2 Command descriptions for direct access devices....................................................... 129
5.2.1 Group 0 commands for direct access devices ............................................... 129
5.2.1.1 Rezero Unit command ..................................................(01h) ....... 129
5.2.1.2 Format Unit command ..................................................(04h) ....... 130
5.2.1.3 Reassign Blocks command ..........................................(07h). ...... 137
5.2.1.4 Read command ............................................................(08h) ....... 139
5.2.1.5 Write command ............................................................(0Ah) ....... 141
5.2.1.6 Seek command.............................................................(0Bh) ....... 142
5.2.1.7 Mode Select (6) command............................................(15h) ....... 143
5.2.1.8 Reserve command........................................................(16h) ....... 147
5.2.1.9 Release command........................................................(17h). ...... 149
5.2.1.10 Mode Sense (6) command ...........................................(1Ah) ....... 150
5.2.1.11 Start Stop Unit command .............................................(1Bh) ....... 183
5.2.1.12 Prevent/Allow Medium Removal command ..................(1Eh). ...... 184
5.2.2 Group 1 command for direct access devices................................................. 184
5.2.2.1 Read Capacity command .............................................(25h) ....... 184
5.2.2.2 Read Extended command ............................................(28h) ....... 186
5.2.2.3 Write Extended command ............................................(2Ah) ....... 188
5.2.2.4 Seek Extended command.............................................(2Bh) ....... 189
5.2.2.5 Write and Verify command............................................(2Eh) ....... 190
5.2.2.6 Verify command ............................................................(2Fh) ....... 191
5.2.2.7 Synchronize Cache command ......................................(35h) ....... 192
5.2.2.8 Read Defect Data command ........................................(37h) ....... 193
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5.2.2.9 Read Long command ...................................................(3Eh) ....... 195
5.2.2.10 Write Long command....................................................(3Fh) ....... 197
5.2.2.11 Write Same command ..................................................(41h) ....... 198
5.2.2.12 Reserve (10) command ................................................(56h) ....... 199
5.2.2.13 Release (10) command ................................................(57h) ....... 200
5.2.2.14 Mode Select (10) command..........................................(55h) ....... 201
5.2.2.15 Mode Sense (10) command .........................................(5Ah) ....... 202
5.2.2.16 Pre-Fetch command .....................................................(34h) ....... 203
5.3 Exclusive Or commands ...................................................................................... 204
5.3.1 XDWRITE command ....................................................................(50h) ....... 205
5.3.2 XPWRITE command ....................................................................(51h) ....... 206
5.3.3 XDREAD command .....................................................................(52h) ....... 207
5.3.4 XDWRITE EXTENDED command................................................(80h) ....... 208
5.3.5 REBUILD command .....................................................................(81h) ....... 210
5.3.6 REGENERATE command ............................................................(82h) ....... 213
6.0 Seagate Technical Support Services................................................................................... 215
A.1.0 Appendix A. SCSI Configured Auto Magically (SCAM).................................................. A-1
List of Figures
Figure 2.0-1 SCSI ID bits................................................................................................................... 7
Figure 3.3-1 Phase sequences with arbitration ..................................................................................23
Figure 3.3-2 Phase sequences without arbitration .............................................................................23
Figure 3.4-1 Simplified SCSI System.................................................................................................24
Figure 3.5.3-1 Wide SCSI byte ordering ...............................................................................................41
Figure 4.4-1. Single command example .............................................................................................54
Figure 4.4-2. Disconnect example ......................................................................................................56