Dell Latitude XPi CD, Reference Manual

Page: 92 / 148

4-22 Dell Latitude XPi CD Reference and Troubleshooting Guide
interface controller is functioning. If the test group is run
in a loop, it can be used to detect intermittent failures.
Subtests
The four subtests in the Network Interface Test Group
confirm the following functions:
•
Registers Test
Checks the interrupt generation capability of the
controller by writing patterns to the writable regis-
ters in the controller and by reading the patterns back
to verify if they are accessible and able to retain data.
•
Loopback Test
Places the controller into its various loopback modes
and tests its ability to transmit and receive data.
Shared RAM Test
Performs a memory test on controllers with memory-
mapped shared RAM. On controllers with first-in
first-out (FIFO) shared RAM, writes a data pattern to
all locations and reads the pattern back to verify the
operation. Some controllers do not support shared
RAM tests.
•
Display Information Test
Displays address and configuration information
about the network controller. This information
includes the network address used for communica-
tion on the local area network (LAN) and the
controller's IRQ level. You can make sure there is
not an interrupt conflict by verifying that the IRQ
level is not being used by another device connected
to the system.
A
udio Test Group
The subtests in the Audio Test Group check the functions
of the audio controller and the computer’s recording and
playback features.
Why Run an Audio Test
If you do not hear sounds from your built-in speakers
when you expect to, it is possible that your operating
system or sound application uses resource settings differ-
ent from those of the audio controller in the computer. In
the absence of an expected sound, first check the docu-
mentation that accompanied your operating system or
sound application to see if the sound features are cor-
rectly configured to work with the computer. The default
resource settings for the audio controller are:
•
DMA channel: 1
•
IRQ line: 5
•
Port address: 220h
If necessary, change the resource settings in your operat-
ing system or sound application to match these default
settings.
If you still do not hear sound when you expect to, run the
Audio Test Group.
NOTE: Before running the Audio Test Group, make sure
to enable the built-in speaker(s), and make sure that the
speaker volume has not been muted.
Subtests
The 11 subtests in the Audio Test Group confirm the fol-
lowing functions:
•
Software Reset Test
Checks for the presence of an active audio controller
in your system
•
Compatibility ID Test
Determines if the correct sound controller is installed
for your system
•
Interrupt Test
Checks to see if the audio controller is generating an
interrupt on the IRQ line configured for that
controller
•
DMA Test
Tests for the presence of a DMA channel on the sys-
tem chip set, and determines if the DMA controller
and the audio controller can exchange signals
•
FIFO RAM Test
Checks the read/write capabilities and status of the
audio controller
•
Initial Reset Status Test
Verifies the reset values of the extended registers on
the audio controller