Table 3–5 Information Transfer Phases - Quantum DLT 8000 Product Manual

SCSI Description
Information Transfer Direction
True I/O Signal: from drive to initiator
False I/O Signal: from initiator to drive
Signal
MSG C/D
0 0
0 0
0 1
0 1
1 1
1 1
3-20
Table 3–5 Information Transfer Phases
I/O Phase Name
0 DATA OUT
1 DATA IN
0 COMMAND
1 STATUS
0 MESSAGE OUT
1 MESSAGE IN
Quantum DLT 8000 Tape System
Direction of Transfer/ Definition
Initiator to drive.
Allows the drive to request that data be
sent from the initiator to the drive.
Drive to initiator.
Allows the drive to send data to the
initiator.
Initiator to drive.
Allows the drive to request a command
from the initiator.
Drive to initiator.
Allows the drive to send status
information be sent from the drive to
the initiator.
Initiator to drive.
Allows the drive to request that
message(s) be sent from the initiator to
the drive; the drive invokes this phase in
response to the attention condition
created by the initiator.
The drive handshakes byte(s) until the
ATN signal is negated, except when
rejecting a message.
See 3.5.5.4 Message Out — Additional
Conditions.
Drive to initiator.
Allows the drive to send message(s) to
the initiator.