Running Configuration Utilities from the SRM Console
C-13
Table C-3 Host Adapter Parameters (Continued)
Parameter
Default
Description
Reason to Change
REQ/ACK
Active
Negation
1
Provide active pullup
assist in single-ended
mode. (the REQ and
ACK signals are pulled
up.) By enabling active
negation, the
ISP1020/1040 host adapter
is less sensitive to an
imperfect SCSI bus.
Data Line
Active
Negation
1
Provide active pullup
assist in single-ended
mode. The SD17-0 and
SDP1-0 signals are pulled
up.) By enable active
negation, the ISP1020 host
adapter is less sensitive to
an imperfect SCSI bus.
Data DMA
Burst Enable
1
When set to 1, performs
bust transfers on the data
DMA channel. When set
to 0, data is transferred in
nonburst mode with each
cycle initiated by a new
address phase.
Optimize system
performance. ¹
Command
DMA Bust
Enable
1
When set to 1, performs
burst transfers on the data
DMA channel. When set
to 0, data is transferred in
nonburst mode with each
cycle initiated by a new
address phase.
Optimize system
performance. ¹
Tag Aging
8
Ensures tagged commands
are not lost in the target
device. Tag aging is a
backup to the timeout
mechanism.
Optimize system
performance. ¹
