Avago Technologies LSI21040 - Manual (Page 38)

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2-20 Installing the LSI21040
2.2.6.2 External Bus Connections
If only external SCSI device connections to your host adapter have been
made, you must terminate the last external device on the SCSI bus. You
must disable the terminators on all other devices. Termination on the host
adapter is automatically enabled in this case.
Figure 2.13 shows an example of how termination is determined for this
SCSI bus configuration.
Figure 2.13 External SCSI Device Termination
Last Device
on Chain–
With the
Does Not
End Chain–
Termination
Disabled
Host Adapter
Automatically
Terminated
Terminator
Installed