Avago Technologies LSI21040 - Manual (Page 39)

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Detailed Installation Procedure 2-21
2.2.6.3 Internal and External Bus Connections
If you have both internal and external SCSI device connections to your
host adapter, you must terminate the last internal and last external
devices on the SCSI bus. You must also disable the termination on all
other devices. Termination on the host adapter is automatically disabled
in this case.
Figure 2.14 shows an example of how termination is determined for this
SCSI bus configuration.