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4-10 Quantum DLT 7000 Tape System
4.2.8 LINKED COMMAND COMPLETE Message (0Ah)
This message is sent from a target to an initiator to indicate that the execution
of a linked command (with the FLAG bit set to zero) is complete and that
status has been sent. The initiator then sets the pointers to the initial state for
the next command.
If received by a target, this message is handled as an illegal message; the drive
enters the MESSAGE IN phase and returns MESSAGE REJECT.
4.2.9 LINKED COMMAND COMPLETE, with Flag Message (0Ah)
This message is sent from a target to an initiator to indicate that the execution
of a linked command (with the FLAG bit set to one) is complete and that status
has been sent.
4.2.10 MESSAGE PARITY ERROR Message (09h)
This message is sent from the initiator to tell the drive that the last message
byte the drive passed on to the initiator contained a parity error.
To indicate that it intends to send the message, the initiator sets the ATN
signal before it releases ACK for the REQ/ACK handshake of the message that
has the parity error. This provides an interlock so that the target can determine
which message has the parity error. If the target receives this message under any
other condition, it proceeds directly to the BUS FREE state by releasing the BSY
signal, signifying a catastrophic error.
The target’s response to this message is to switch to the MESSAGE IN phase
and re-send from the beginning all the bytes of the message that precipitated the
MESSAGE PARITY ERROR message.
4.2.11 MESSAGE REJECT Message (07h)
This message is sent from the initiator or target to indicate that the last
message received was inappropriate or has not been implemented.
To indicate its intention to send this message, the initiator asserts the ATN
signal before it releases ACK for the REQ/ACK handshake of the message that
is to be rejected. MESSAGE REJECT is issued in response to any message the
drive considers to be illegal or not supported. When sending to the initiator, the
tape drive does so before requesting any additional message bytes.