SCSI BUS
7-14 C156-E228-02EN
(3) Signal sources
Table 7.6 lists signal sources for each interface phase.
Table 7.6 Bus phases and signal sources
Signal
Bus phase
BSY SEL I/O
C/D
MSG
REQ ACK
DB7-0,
P
ATN TRS
BUS
FREE
N N N N N N N N A
ARBIRATION A W N N N N ID N A
SELECTION I&T I N N N N I I A
RESELECTION I&T T
T
N
N
N
T
I
A
COMMAND T N T T T I I I A
DATA
IN
T N T T T I T I A
DATA
OUT
T N T T T I I I A
STATUS
T N T T T I T I A
MESSAGE
IN T N T T T I T I A
MESSAGE
OUT
T N T T T I I I A
A:
Any SCSI device can drive the signal. Two or more SCSI devices may
drive the signal at the same time.
I:
Only the SCSI device which operates as an INIT can drive the signal.
I&T: INIT, TARG, or both can drive this signal according to the interface
sequence.
In the RESELECTION phase, there is a sequence to be driven
simultaneously by both.
ID: Each SCSI device which is actively arbitrating the bus drives a unique data
bit (SCSI ID). The parity bit may be undriven or driven to the true state, but
must never be driven to the false state.
N:
Not to be driven by any SCSI device. The terminator pulls the signal to the
false state.
T:
Only the SCSI device which operates as an TARG can drive the signal.
W:
Only one SCSI device which wins ARBITRATION can drive the signal.
Summary of Contents for MCM3064SS
Page 1: ...C156 E228 02EN MCM3064SS MCM3130SS MCP3064SS MCP3130SS OPTICAL DISK DRIVES PRODUCT MANUAL ...
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Page 42: ...Specifications 2 12 C156 E228 02EN Figure 2 3 Example of alternate processing ...
Page 47: ...3 2 Mounting Requirements C156 E228 02EN 3 5 Figure 3 2 Outer dimensions 1 of 2 ...
Page 49: ...3 2 Mounting Requirements C156 E228 02EN 3 7 Figure 3 3 Outer dimensions 1 of 3 ...
Page 51: ...3 2 Mounting Requirements C156 E228 02EN 3 9 Figure 3 3 Outer dimensions 3 of 3 ...
Page 82: ...Installation 4 16 C156 E228 02EN Figure 4 6 SCSI connection check ...
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Page 148: ...SCSI BUS 7 46 C156 E228 02EN Figure 7 21 Bus phase sequence 1 of 2 ...
Page 149: ...7 8 Bus Sequence C156 E228 02EN 7 47 Figure 7 21 Bus phase sequence 2 of 2 ...
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