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A message can be one or more bytes in length. One or more messages can be sent
during a single MESSAGE phase, but a message cannot be split over MESSAGE
phases. The initiator is required to end the MESSAGE OUT phase (by negating
ATN) when it sends certain messages that are identified in Table 4–2.
When a connection to the drive is established (i.e., the drive is selected with ATN
asserted), the first message byte passed by the initiator must be either an
IDENTIFY, ABORT, or BUS DEVICE RESET message. If not, the drive discards
the message, saves no status information, and goes to the BUS FREE phase.
If an initiator supplies an unsupported message (for example, COMMAND
COMPLETE or a reserved or undefined message code), the drive returns a
MESSAGE REJECT message and continues where it left off (possibly returning to
MESSAGE OUT if ATN is raised).
The first byte of the message, as defined in Table 4–1, determines the format of the
message.
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00h One-byte message (COMMAND COMPLETE)
01h Extended message
02h – 1Fh One-byte message
20h – 2Fh Two-byte message
40h – 7Fh Reserved
80h – FFh One-byte message (IDENTIFY)
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The DLT8000 tape drive supports the messages listed in Table 4–2. The message
code and the direction of the message flow is also included in the table (In = target
to initiator, Out = initiator to target).