SCSI Description
3-4
Quantum DLT 4000 Tape Drive
Table 3–1 Implemented ANSI SCSI-2 Commands (continued)
Command
Code
Class
Description
SPACE
11h
Mandatory
Provides a selection of positioning
functions (both forward and backward)
that are determined by the code and
count.
TEST UNIT READY
00h
Mandatory
Provides a means to check if the logical
unit is ready.
VERIFY
2Fh
Optional
Requests the drive to verify the data
written to the medium.
WRITE
0Ah
Optional
Requests the drive to write the data
transferred from the initiator to the
medium.
WRITE BUFFER
3Bh
Optional
Used in conjunction with the READ
BUFFER command as a diagnostic for
testing target memory and the integrity
of the SCSI bus.
Used to update drive firmware from the
host via the SCSI bus.
WRITE FILEMARKS
10h
Mandatory
Requests that the target write the
specified number of filemarks or
setmarks to the current position on the
logical unit.
3.3
SIGNAL STATES
The following paragraphs describe signal values and SCSI ID bits.
3.3.1 Signal Values
All signal values are actively driven true (low voltage). Because the signal
drivers are OR-tied, the bus terminator’s bias circuitry pulls false when it is
released by the drivers at every SCSI device. If any device asserts a signal, (e.g.,
OR-tied signals), the signal is true. Table 3–2 shows the ANSI-specified and
defined signal sources. Any device can assert RST at any time.
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: ......