Avago Technologies LSI53C120 - Manual (Page 12)

4 LSI20101/LSI20102 SCSI Bus Boards
2 LSI20101 SCSI Bus Extender Board
The SCSI functionality for the LSI20101 Extender board is contained
within the LSI53C120 SCSI Bus Expander chip. The LSI20101 physically
isolates yet logically connects two SE SCSI bus segments, regenerates
timing, and passes bus protocol in compliance with the SCSI standard.
The LSI20101 board is designed for computer systems needing physical
and/or electrical isolation, and/or extension of the SCSI bus.
Figure 1
illustrates the component location on the LSI20101 board.
Figure 1 LSI20101 SCSI Bus Extender Board
NC
J1
J3 J2
U5
U8
LSI53C120
J4
SE-A SE-B
SW1 - SE-A TERMPWR
SW2 - SE-B TERMPWR
SW3 - SE-A TERM OFF
SW4 - SE-B TERM OFF
CR3 - SE-B TERMPWR SHORTED
CR5 - SE-A BUSY
CR6 - SE-A TERMPWR SHORTED
U4
SW-1
SW-2
SW-3
SW-4
CR3 CR5 CR6
SE-A
TERM
SE-B
TERM
BUSY LSI20101
3.00"
4.00"
2.55"
3.75"
0.125"
U1
U10 U2
U11 U3
U9
GND GND +5V
Diameter
(x4)