![background image](http://html1.mh-extra.com/html/quantum/dlttape-dlt-4000/dlttape-dlt-4000_product-manual_3688580067.webp)
SCSI Description
Quantum DLT 4000 Tape Drive
3-5
Table 3–2 Signal Sources
Signals
Bus Phase
BSY
SEL
C/D I/O
MSG REQ
ACK ATN
DB(7–0)
DB(P)
DB(15-8)
DB(P1)
BUS FREE
None
None
None
None
None
None
ARBITRATION
All
Winner
None
None
S ID
S ID
SELECTION
I&T
Init
None
Init
Init
Init
RESELECTION
I&T
Targ
Targ
Init
Targ
Targ
COMMAND
Targ
None
Targ
Init
Init
None
DATA IN
Targ
None
Targ
Init
Targ
Targ
DATA OUT
Targ
None
Targ
Init
Init
Init
STATUS
Targ
None
Targ
Init
Targ
None
MESSAGE IN
Targ
None
Targ
Init
Targ
None
MESSAGE OUT
Targ
None
Targ
Init
Init
None
All:
The signal is driven by all SCSI devices that are actively arbitrating.
SCSI ID: Each SCSI device that is actively arbitrating asserts its unique SCSI ID bit. The other
seven (or fifteen) data bits are released. The parity bit DB (P or P1) can be released or
driven true, but is never driven false during this phase.
I&T:
The signal is driven by the initiator, drive, or both, as specified in the SELECTION and
RESELECTION phase.
Init:
If driven, this signal is driven only by the active initiator.
None:
The signal is released; that is, not driven by any SCSI device. The bias circuitry of the bus
terminators pulls the signal to the false state.
Winner: The signal is driven by the winning SCSI device.
Targ:
If the signal is driven, it is driven only by the active drive.
Summary of Contents for DLTtape DLT 4000
Page 1: ...DLT 4000 Tape Drive Product Manual November 10 2003 81 60043 04 ...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued ...
Page 6: ......
Page 24: ...About This Manual Quantum DLT 4000 Tape Drive xxiv ...
Page 62: ...Hardware Implementation 2 28 Quantum DLT 4000 Tape Drive ...
Page 100: ...Messages 4 12 Quantum DLT 4000 Tape Drive ...
Page 264: ...SCSI Commands 5 164 Quantum DLT 4000 Tape Drive ...
Page 274: ...Appendix B EEPROM Resident Bugcheck and Event Logs B 6 Quantum DLT 4000 Tape System ...
Page 280: ...Appendix C Updating the Firmware C 6 Quantum DLT 4000 Tape Drive ...
Page 298: ...Index Index 6 Quantum DLT4000 Tape Drive ...
Page 299: ......