User`s guide

A-4
AHA-2940UW/OF and AHA-2944UW/OF User’s Guide
Reset Initialization Default Data Adjustments
SCSI ID Configuration Flags
Wide
Host Adapter Control
Fast-20
Autotermination
Bit 5 Initiate Wide SCSI Negotiation
0 This bit is cleared (DISABLED) for SCSI IDs 0 through
7 when it has been sensed that the
WIDEPS
#
input has
been deasserted.
1 This bit is set (ENABLED) for all SCSI IDs when it has
been sensed that the
WIDEPS
#
input has been asserted.
Bit 1 UltraSCSI Mode
0 This bit is cleared (DISABLED) when the
GND
/
REXT
pin is sensed as being tied to ground.
1 This bit is set (ENABLED) when the
GND
/
REXT
pin is
sensed as having an external precision resistor
present.
Bit 0 Automatic Cable-Sensing Termination
0 This bit is cleared (DISABLED) for products that do
not support automatic cable-sensing termination.
1 This bit is set (ENABLED) for products that support
automatic cable-sensing termination.
Bit 7 Automatic Current-Sensing Termination
0 This bit is always cleared (DISABLED).