Quantum DLT 8000 Handbuch Seite 129

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SCSI Description
Quantum DLT 8000 Tape System 3-27
Table 36 Drive MESSAGE OUT Phase Response
ATN Signal True in Phase... The Drive Enters MESSAGE OUT…
COMMAND After transferring part or all of the command descriptor
block bytes.
DATA At the drive’s earliest convenience (often on a logical
block boundary). The initiator continues REQ/ACK
handshakes until it detects the phase change.
STATUS After the status byte has been acknowledged by the
initiator.
MESSAGE IN Before it sends another message. This permits a MESSAGE
PARITY ERROR message from the initiator to be
associated with the appropriate message.
SELECTION
1
Immediately after that SELECTION phase.
RESELECTION
2
After the drive has sent its IDENTIFY message for that
RESELECTION phase.
1
Before the initiator releases BSY, provided the initiator asserted ATN
2
The initiator should only assert the ATN signal during a RESELECTION phase to transmit
a BUS DEVICE RESET or DISCONNECT message.
The initiator keeps the ATN signal asserted if more than one byte is to be transferred.
The initiator can negate the ATN signal at any time, except it does not negate the ATN
signal while the ACK signal is asserted during a MESSAGE OUT phase. Normally, the
initiator negates the ATN signal while the REQ signal is true and the ACK signal is
false during the last REQ/ACK handshake of the MESSAGE OUT phase.
3.6.2 Reset Condition
The tape drive responds to power-on and/or bus reset conditions as described:
All tape drive SCSI lines assert high impedance when the tape drive is powered off.
The drive does not generate any spurious signals on the SCSI bus when the drive is
powered on.
Within five (5) seconds of power-on, and within 250 milliseconds (typically under 4
milliseconds) after a bus reset, the tape drive responds to SCSI bus selections and
returns the appropriate normal responses. Tape motion commands are returned with
Check Condition status, Sense Key of Not Ready, until the medium has been made
ready.
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