Interfaces and Connectors
EPM-15 Reference Manual
37
Audio
The audio interface on the EPM-15 is implemented using the Analog Devices AD1981B Audio
Codec (EPM-15g, h) or the National Semiconductor LM4549B (EPM-15S, E). This interface is
AC ’97 2.1 compatible. Drivers are available for most Windows-based operating systems. To
obtain the most current versions, consult the EPM-15 product support page
.
J13 provides the line-level stereo input and line-level stereo output connection points. The
outputs will drive any standard-powered PC speaker set.
These connectors use IEC 61000-4-2-rated TVS components to help protect against ESD damage.
S
OFTWARE
C
ONFIGURATION
The audio interface uses PCI interrupt “INTB#”. CMOS Setup is used to select the IRQ line
routed to INTB#.
The audio controller can be disabled within CMOS Setup.
Table 11: J13 Audio Connector
Pin
Signal
Name
Function
1 LINE_OUTR
Line-Out
Right
2 Ground Ground
3 LINE_OUTL
Line-Out
Left
4 Ground Ground
5 LINE_INR Line-In
Right
6 Ground Ground
7 LINE_INL Line-In
Left
8 Ground Ground
CPU Temperature Monitor
A thermometer circuit constantly monitors the die temperature of the CPU. This circuit can be
used to detect over-temperature conditions, which can result from fan or heat sink failure or
excessive ambient temperatures, and under-temperature conditions.
The CMOS setup is used to set the temperature detection threshold. A status bit in the Special
Control Register bit D5 of I/O port 1D0h, can be read to determine if the die temperature is above
or below the threshold.
Contact the factory for information on clearing the status bit or reading and writing to the
thermometer circuit. See page 41 for additional information.
