Quantum 10K II - Manual (Page 353)

Appendix B. SCSI Bus Signal Timing
B–32 Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
B.8.11 LINKED COMMAND COMPLETE Message (0Ah)
The drive sends the LINKED COMMAND COMPLETE Message to the initiator to
signal that the execution of a linked command has been completed and the status
has been sent. The initiator should then set the pointers to the initial state for the
next linked command.
B.8.12 LINKED COMMAND COMPLETE (WITH FLAG) Message (0Bh)
The drive sends the LINKED COMMAND COMPLETE (WITH FLAG) message to
the initiator to signal that the execution of a linked command (with the flag bit set)
has been completed and the status has been sent. The initiator should then set the
pointers to the initial state for the next linked command.
B.8.13 MESSAGE PARITY ERROR Message (09h)
This message tells the drive that the last message byte it passed to the host
contained a parity error. If the bus phase was not Message In when the host
asserted ATN, the drive releases the SCSI bus.
B.8.14 MESSAGE REJECT Message (07h)
The MESSAGE REJECT message is sent from either the drive or the initiator to
indicate that the last message or message byte received was inappropriate or has not
been implemented.
To indicate its intention of sending this message, the initiator asserts the ATN
signal before it releases the ACK signal for the REQ/ACK handshake of the message
byte that is to be rejected. If the drive receives this message under any other
circumstances, it rejects the message
When a drive sends the MESSAGE REJECT message, it changes to the MESSAGE
IN phase and sends it before requesting additional messages bytes from the initiator.
This provides an interlock so that the initiator can determine which message byte
was rejected.
After a drive sends a MESSAGE REJECT message, and if the ATN signal is still
asserted, the drive returns to the MESSAGE OUT phase. The subsequent MESSAGE
OUT phase begins with the first byte of a message.