Messages

4.2.4 DISCONNECT Message (04h)

The DISCONNECT message is sent from the drive to inform the initiator that the present connection is going to be broken (the drive plans to disconnect by releasing the BSY signal) and a later reconnect will be required to complete the current I/O process. The message does not cause the initiator to save the data pointer. After sending the message, the drive goes to the BUS FREE phase by releasing the BSY signal.

The DISCONNECT message can also be sent by the initiator to tell the drive to suspend the current phase and disconnect from the bus. The drive’s response to and its handling of a DISCONNECT message are based on when, in the I/O process, the initiator introduces the DISCONNECT message. Table 4–4 summarizes the drive’s response.

 

Table 4–4 Drive Response to DISCONNECT Message

 

 

BUS Phase

Drive Response

 

 

SELECTION

The drive discards the DISCONNECT message and goes to BUS FREE.

COMMAND

The drive discards the DISCONNECT message and goes to BUS FREE. The

 

ATTENTION request is ignored while the Command Descriptor Block is

 

fetched. The drive does not switch to MESSAGE OUT until the current

 

DMA completes.

DATA

The ATTENTION request is ignored while the current data transfer

 

completes; that is, the drive does not switch to MESSAGE OUT until

 

after the current DMA completes. The drive returns a MESSAGE REJECT

 

message and responds with CHECK CONDITION status, indicating the

 

command aborted because of an invalid message.

STATUS

The drive sends a MESSAGE REJECT message, then sends COMMAND

 

COMPLETE.

MESSAGE IN

The drive sends a MESSAGE REJECT message and switches to the BUS

 

FREE phase.

 

 

4-6

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Disconnect Message 04h, Drive Response to Disconnect Message, Selection, Complete
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