Quantum DLT 8000 Handbuch PDF herunterladen (Seite 122)

SCSI Description

3-20 Quantum DLT 8000 Tape System

Information Transfer Direction

True I/O Signal: from drive to initiator

False I/O Signal: from initiator to drive

Table 3–5 Information Transfer Phases

MSG

Signal

C/D I/O Phase Name Direction of Transfer/ Definition

0 0 0 DATA OUT Initiator to drive.

Allows the drive to request that data be

sent from the initiator to the drive.

0 0 1 DATA IN Drive to initiator.

Allows the drive to send data to the

initiator.

0 1 0 COMMAND Initiator to drive.

Allows the drive to request a command

from the initiator.

0 1 1 STATUS Drive to initiator.

Allows the drive to send status

information be sent from the drive to

the initiator.

1 1 0 MESSAGE OUT 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.

1 1 1 MESSAGE IN Drive to initiator.

Allows the drive to send message(s) to

the initiator.

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