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Barracuda 4LP Installation Guide, Rev. B
68 Pin SCSI I/O
Connector
J1
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
not used
Host Alternate
Usage Plug
+5V
+5V
N.C.
Ground
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
Figure 12. Using J1-Auxillary connector for model "W"
and "WD" drive alternate ID select and LED
connection
+5V
Ground
Pin 1
A
3 A 2 A 1
A 0
11 9 7 5 3 1
12 10 8 6 4 2
Drive Activity LED
J1-Auxiliary
Pin 1A
J1-DC Power
4P
3P2P
(default)
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
A 0 A 1 A 2 A 3
Remote Switches
Pins 2, 4, 6, and 8 are normally
not grounded. They are driven low
(ground) for 250 ms after a Reset or
PWR ON to allow drive to read
SCSI ID selected. Pin 8 may
also be used to drive the cathode
of an external Activity LED.
W/WD drives
Drive
HDA
Rear
1P
PCB
41
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