Adaptec 2940UW User's Guide download pdf (Page 42)

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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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Adaptec 2940UW User's Guide Page 42