Quantum DLTtape DLT 4000, Product Manual

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Table of Contents
viii Quantum DLT 4000 Tape Drive
2.5.2 Selecting Density......................................................................... 2-21
2.6 Power On Self Test (POST).................................................................... 2-23
2.7 Troubleshooting................................................................................... 2-25
Chapter 3: SCSI Description..................................................................................... 3-1
3.1 SCSI Overview ...................................................................................... 3-1
3.2 SCSI Commands.................................................................................... 3-1
3.3 Signal States ........................................................................................ 3-4
3.3.1 Signal Values .............................................................................. 3-4
3.3.2 SCSI ID Bits.................................................................................. 3-6
3.4 SCSI Signals.......................................................................................... 3-6
3.4.1 SCSI Signal Definitions................................................................. 3-6
3.4.2 Signal Bus Timing........................................................................ 3-7
3.5 SCSI Bus Phases .................................................................................... 3-10
3.5.1 BUS FREE Phase ........................................................................... 3-10
3.5.2 ARBITRATION Phase ..................................................................... 3-12
3.5.3 SELECTION Phase ........................................................................ 3-13
3.5.4 RESELECTION Phase ..................................................................... 3-15
3.5.5 Information Transfer Phases........................................................ 3-17
3.6 SCSI Bus Conditions.............................................................................. 3-24
3.6.1 Attention Condition.................................................................... 3-24
3.6.2 Reset Condition .......................................................................... 3-25
3.6.3 Queued Unit Attentions.............................................................. 3-26
Chapter 4: Messages............................................................................................... 4-1
4.1 Message Format ................................................................................... 4-1
4.2 Supported SCSI Messages..................................................................... 4-5
4.2.1 ABORT Message (06h)................................................................. 4-5
4.2.2 BUS DEVICE RESET Message (0Ch) ............................................... 4-5
4.2.3 COMMAND COMPLETE Message (00h) ........................................ 4-5
4.2.4 DISCONNECT Message (04h) ....................................................... 4-6
4.2.5 IDENTIFY Message (80h - FFh)...................................................... 4-7
4.2.6 INITIATOR DETECTED ERROR Message (05h) ................................. 4-8
4.2.7 LINKED COMMAND COMPLETE Message (0Ah) ............................. 4-9
4.2.8 LINKED COMMAND COMPLETE, with Flag Message (0Ah).............. 4-9
4.2.9 MESSAGE PARITY ERROR Message (09h)....................................... 4-9
4.2.10 MESSAGE REJECT Message (07h)................................................. 4-9
4.2.11 NO OPERATION Message (08h).................................................... 4-10
4.2.12 RESTORE POINTERS Message (03h) .............................................. 4-10
4.2.13 SAVE DATA POINTER Message (02h)............................................ 4-10
4.2.14 SYNCHRONOUS DATA TRANSFER REQUEST Message ..................... 4-10