Signal Source - Fujitsu C150-E049-02EN Oem Manual

3-10
Table 3.4 Signal Source
Bus Phase
BUS FREE
ARBITRATION
SELECTION
RESELCTION
COMMAND
DATA IN
DATA OUT
STATUS
MESSAGE IN
MESSAGE OUT
All: The signal shall be driven by all SCSI devices that are actively
arbitrating.
S ID: A unique data bit (the SCSI ID) shall be driven by each SCSI
device that is actively arbitrating; the other seven data bits shall be
released (i.e., not driven) by this SCSI device. The parity bit
(DB(P)) may be released or driven to the true state, but shall never
be driven to the false state during this phase.
The signal shall be driven by the initiator, target or both, as
specified in the SELECTION phase and RESELECTION phase.
Init: If driven, this signal shall be driven only by the active initiator.
None: The signal shall be released; that is, not be driven by any SCSI
device. The bias circuitry of the bus terminators pulls the signal to
the false state.
Win: The signal shall be driven by the one SCSI device that wins
arbitration.
Targ: If the signal is driven, it shall be driven only by the active target.
C/D, I/O,
MSG,
BSY SEL REQ
None None None
All Win None
I&T Init None
I&T Targ Targ
Targ None Targ
Targ None Targ
Targ None Targ
Targ None Targ
Targ None Targ
Targ None Targ
ACK, DB(7,0)
ATN DB(P)
None None
None S ID
Init Init
Init Targ
Init Init
Init Targ
Init Init
Init Targ
Init Targ
Init Init
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