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SCSI Description
3-26
Quantum DLT 8000 Tape System
3.6
SCSI Bus Conditions
The SCSI bus has two asynchronous conditions: Attention and Reset.
3.6.1 Attention Condition
The attention condition informs a drive that an initiator has a message ready. The drive
gets the message by performing a MESSAGE OUT phase. The attention condition
requires the following timing:
•
The initiator creates the attention condition by asserting ATN at any time
except during the ARBITRATION or BUS FREE phases.
•
The initiator negates the ATN signal at least two deskew delays before
asserting the ACK signal while transferring the last byte of the message.
•
If the drive detects that the initiator failed to meet this requirement, then
the drive goes to BUS FREE.
•
Before transition to a new bus phase, the initiator asserts the ATN signal,
then waits at least two deskew delays before negating the ACK signal for
the last byte transferred in the current bus phase. Asserting the ATN signal
later cannot be honored until a later bus phase and then cannot result in
the expected action.
The drive responds with MESSAGE OUT as described in the following table.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
Page 6: ......
Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
Page 102: ......
Page 372: ......
Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
Page 407: ......