SCSI Description
Quantum DLT 4000 Tape Drive
3-13
4.
The SCSI device waits at least an arbitration delay to determine arbitration
results.
NOTE
Step 4 requires that every device complete the arbitration phase to
the point of SEL being asserted (for a SELECTION or RESELECTION
phase) to avoid hanging the bus.
•
If a higher priority SCSI ID bit is true on the DATA BUS, the SCSI
device loses the arbitration.
•
The losing SCSI device releases the BSY signal and its SCSI ID bit
within one bus clear delay after the SEL signal asserted by the
arbitration winner becomes true.
•
The losing SCSI device waits for the SEL signal to become true
before releasing the BSY signal and SCSI ID bit when arbitration is
lost.
•
The losing SCSI device returns to Step 1.
•
If no higher priority SCSI ID bit is true on the DATA BUS, the SCSI
device wins the arbitration and asserts the SEL signal.
•
The winning SCSI device waits at least one bus clear delay plus one
bus settle delay after asserting the SEL signal before changing any
signals.
3.5.3 SELECTION Phase
The SELECTION phase allows an initiator to select a drive to initiate a drive
function.
The SCSI device that won the arbitration has both the BSY and SEL signals
asserted and has delayed at least one bus clear delay plus one bus settle delay
before ending the ARBITRATION phase. The SCSI device that won the
arbitration becomes an initiator by not asserting the I/O signal.
During SELECTION, the I/O signal is negated so that this phase can be
distinguished from the RESELECTION phase.
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: ......