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Table of Contents
Quantum DLT 7000 Tape System
viii
2.5 Power On Self Test (POST)..................................................................... 2-23
2.6 Troubleshooting ................................................................................... 2-25
Chapter 3: SCSI DESCRIPTION
3.1 SCSI Overview....................................................................................... 3-1
3.2 SCSI Commands.................................................................................... 3-2
3.3 Signal States......................................................................................... 3-4
3.3.1 Signal Values................................................................................ 3-4
3.3.2 SCSI ID Bits................................................................................... 3-5
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 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 IGNORE WIDE RESIDUE Message (23h)........................................... 4-8
4.2.7 INITIATOR DETECTED ERROR Message (05h)................................... 4-9
4.2.8 LINKED COMMAND COMPLETE Message (0Ah).............................. 4-10
4.2.9 LINKED COMMAND COMPLETE, with Flag Message (0Ah).............. 4-10
4.2.10 MESSAGE PARITY ERROR Message (09h)...................................... 4-10
4.2.11 MESSAGE REJECT Message (07h)................................................. 4-10
4.2.12 NO OPERATION (08h).................................................................. 4-11
4.2.13 RESTORE POINTERS Message (03h).............................................. 4-11
4.2.14 SAVE DATA POINTER Message (02h)............................................ 4-11
4.2.15 SYNCHRONOUS DATA TRANSFER REQUEST Message (01h)............. 4-11
4.2.16 WIDE DATA TRANSFER REQUEST Message (01h)............................ 4-13