Avago Technologies LSI53C120 - Manual (Page 27)

LSI20101/LSI20102 SCSI Bus Boards 19
•
Connect optional harness to connector J4 for external control of
active SCSI terminators that use external switches and to view SCSI
bus activity on an LED
Figure 4 LSI20102 Board Installation
NC
J1
U11
LSI53C120
J4
SW1 - SE TERMPWR
SW2 - DIFF TERMPWR
SW3 - SE TERM OFF
SW4 - DIFF TERM OFF
CR1 - DIFF TERMPWR SHORTED
CR7 - BUSY
CR10 - SE TERMPWR SHORTED
U8
SW-1
SW-2
SW-3
SW-4
CR1 CR7
SE-A
TERM
SE-B
TERM
BUSY LSI20102
U1
GND GND +5V
CR10
DIFF SE
J2 J3
U2
U3
U7
U6
U5
U12
U13
U14
0.125” Diameter
Mounting Hole
for Fastener
Mounting Hole
for Fastener Mounting Hole
for Fastener
Mounting Hole
for Fastener
Optional LED
and Control
Termination
Harness
SCSI Single-
Ended Connector
Differential
SCISI Connector
Power
Plug