Dell Latitude XPi Reference Guide - Page 92

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 registers 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 memorymapped 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 communication 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. Audio 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 different from those of the audio controller in the computer. In the absence of an expected sound, first check the documentation that accompanied your operating system or sound application to see if the sound features are correctly 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 operating 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 following 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 system 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 4-22 Dell Latitude XPi CD Reference and Troubleshooting Guide