Adaptec AHA-2940UW User Guide - Page 42

Reset Initialization Default Data Adjustments

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AHA-2940UW/OF and AHA-2944UW/OF User's Guide Reset Initialization Default Data Adjustments SCSI ID Configuration Flags Wide 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. Host Adapter Control Fast-20 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. Autotermination 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). A-4 Downloaded from www.Manualslib.com manuals search engine

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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
).
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