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Chapter 3: SCSI Messages
3-6
July 2004
81-81276-01 Rev A01
3.2.8 INITIATOR DETECTED ERROR (05h)
An initiator sends this message to inform a target that an error, for example, a bus parity error, has
occurred that does not prevent the target from attempting the operation again. Upon receiving this
message, the tape drive tries to retransfer the last command, data, or status bytes by using the
RESTORE POINTERS message.
3.2.9 LINKED COMMAND COMPLETE (0Ah)
A target sends this message to an initiator to indicate that the execution of a linked command (with the
Flag bit set to 0) is complete and that the target has sent status back to the initiator. The initiator then
sets the pointers to the initial state for the next command.
When a target receives this message, it handles it as an illegal message. The tape drive enters the
MESSAGE IN phase and returns MESSAGE REJECT.
3.2.10 LINKED COMMAND COMPLETE, with flag (0Bh)
A target sends this message to an initiator to indicate that the execution of a linked command (with the
Flag bit set to 1) is complete and that the target has sent status back to the initiator.
3.2.11 MESSAGE PARITY ERROR (09h)
An initiator sends this message to the target to indicate that one or more bytes in the last message it
received had 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 conditions, it proceeds directly to the BUS FREE phase by releasing the BSY signal.
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 generated the original MESSAGE PARITY ERROR
message.
Summary of Contents for DLTtape DLT1
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
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