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Chapter 2 Messages
Supported SCSI Messages
16
Quantum ATL SuperLoader Software Interface Guide
Table 5 Identify
Message
Ignore Wide
Residue (23h)
2
The IGNORE WIDE RESIDUE message is sent by the target to the
initiator to indicate that the number of valid bytes sent during the
last REQ/ACK handshake and REQB/ACKB handshake of a
DATA IN phase is less than the negotiated transfer width. The
Ignore field indicates the number of invalid data bytes transferred.
This message is sent immediately following that DATA IN phase
and prior to any other messages.
illustrates the data
format of an IGNORE WIDE RESIDUE message.
describes
the Ignore field bit definitions.
Field
Description
Identify
The Identify bit must be set to 1. This identifies the message as an IDENTIFY
message.
DiscPriv
Disconnect Privilege. The DiscPriv can be 0, provided that no other I/O
process is currently active in the SuperLoader. If not set to 1 and other I/O
processes are currently active in the SuperLoader, the SuperLoader returns
BUSY status.
LUNTAR
The Logical Unit/Target Routine (LUNTAR) field must be set to zero. The
SuperLoader does not support target routines. A LUNTAR bit of one causes
the drive to send a MESSAGE REJECT message and switch to the BUS FREE
phase.
Reserved
The Reserved bits must be zero. If a Reserved bit is non-zero, the
SuperLoader returns a MESSAGE REJECT message and switches to the BUS
FREE phase.
LUNTRN
Logical Unit Number. The SuperLoader has two logical units. The tape
drive is always logical unit 0, and the media changer device is always logical
unit 1.
Summary of Contents for SuperLoader DLT
Page 1: ...ATL SuperLoader DLT and ATL SuperLoader LTO Software Interface Guide 81 60220 01 A02...
Page 18: ...Preface Document Conventions xviii Quantum ATL SuperLoader Software Interface Guide...
Page 44: ...Chapter 2 Messages Supported SCSI Messages 26 Quantum ATL SuperLoader Software Interface Guide...
Page 196: ...Index 178 Quantum ATL SuperLoader Software Interface Guide...