Quantum DLT 8000 Instrukcja Obsługi Pobierz pdf (Strona 9)

Table of Contents

Quantum DLT 8000 Tape System vii

CHAPTER 3: SCSI DESCRIPTION

3.1 SCSI Overview ......................................................................................................................................3-1

3.2 SCSI Commands...................................................................................................................................3-3

3.3 Signal States.........................................................................................................................................3-7

3.3.1 Signal Values ...............................................................................................................................3-7

3.3.2 SCSI ID Bits....................................................................................................................................3-7

3.4 SCSI Signals...........................................................................................................................................3-9

3.4.1 SCSI Signal Definitions................................................................................................................3-9

3.4.2 Signal Bus Timing..................................................................................................................... 3-10

3.5 SCSI Bus Phases................................................................................................................................. 3-13

3.5.1 BUS FREE Phase......................................................................................................................... 3-13

3.5.2 ARBITRATION Phase ................................................................................................................. 3-15

3.5.3 SELECTION Phase...................................................................................................................... 3-16

3.5.4 RESELECTION Phase.................................................................................................................. 3-17

3.5.5 Information Transfer Phases................................................................................................... 3-19

3.5.5.1 Asynchronous Data Transfer........................................................................................ 3-22

3.5.5.2 Synchronous Data Transfer........................................................................................... 3-23

3.5.5.3 Signal Restrictions Between Phases ............................................................................ 3-24

3.5.5.4 STATUS Phase.................................................................................................................. 3-25

3.6 SCSI Bus Conditions ......................................................................................................................... 3-27

3.6.1 Attention Condition................................................................................................................. 3-27

3.6.2 Reset Condition......................................................................................................................... 3-28

3.6.3 Queued Unit Attentions .......................................................................................................... 3-29

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