CHAPTER 6: SCSI Description
Table 6-3.
ANSI 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 SDLT220
Page 1: ...TANDBERG Super DLTTM Product manual Revision 2 June 2002 432589 01 ...
Page 20: ...CHAPTER 1 Introduction ...
Page 34: ...CHAPTER 2 SDLT 220 320 Product Information ...
Page 52: ...CHAPTER 3 Drive Specifications ...
Page 76: ...CHAPTER 4 Installing Your Tape Drive ...
Page 92: ...CHAPTER 5 Using Your Tape Drive ...
Page 104: ...CHAPTER 6 SCSI Description ...
Page 120: ...APPENDIX A SDLT I Tape Cartridge ...
Page 130: ...APPENDIX B DLT IV Tape Cartridge ...