When placed in the IN position, the termination control logic indicates that
an internal wide device is attached.
S3
When placed in the OUT position, the termination control logic
automatically senses a narrow or wide SCSI cable and terminator on the
external bus.
When placed in the IN position, the termination control logic indicates that
an external narrow SCSI cable and terminator is attached.
This is useful in cases where a narrow device is incorrectly identified as
wide. This is necessary if the SCSI cable improperly grounds all unused
pins, which indicates to the logic that a wide cable and terminator is
attached.
S4
When placed in the OUT position, the termination control logic
automatically determines that a cable and terminator are attached to the
external bus. This is used in conjunction with S3 to determine whether a
cable and terminator is attached and whether it is narrow or wide.
When placed in the IN position, the termination control logic indicates that
an external device is attached. This works in conjunction with S3 to
determine narrow or wide device attachment.
When there are no cables attached, the jumpers are set to the default setting of OUT
and the SCSI terminators are enabled for wide SCSI. This ensures that an adapter
with nothing attached has SCSI terminators enabled to pass diagnostics.
Figure
C-1. Jumper Locations and Default Settings
C-2
PCI SCSI-2 Fast/Wide Single-Ended Adapter Installation Guide
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