Chapter 2: General SCSI Bus Operation
2-4
July 2004
81-81276-01 Rev A01
The tape drive writes (flushes) the write data cache to the data cartridge under the following
circumstances:
•
An initiator issues one or more WRITE FILEMARKS commands without intervening medium
motion commands.
•
An initiator issues a WRITE 0 FILEMARKS command.
•
The tape drive automatically writes data in the cache longer than specified by the value of the
Mode Parameter “Write Delay Time” to the data cartridge.
•
The tape drive receives a non-write type medium access command; for example, SPACE, READ,
UNLOAD, REWIND, and so forth.
2.7
Other SCSI Functionality
The tape drive supports these additional functions:
•
Linked commands
•
Untagged queuing.
2.8
Bus Phases
The tape drive conforms to the bus state transition table shown in the SCSI-2 standard, “Phase
Sequences.” The information in the following sections also applies.
2.8.1 ATTENTION Signal Response
The tape drive responds to an ATN condition at least at every phase transition, as long as the initiator
sets the ATN bit before the target abandons the REQ for the last byte of the previous phase. Ordinarily
the tape drive immediately recognizes ATN and changes the bus phase to MESSAGE OUT.
Summary of Contents for DLTtape DLT1
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
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