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4.2.6 AC'97 Digital Audio
The conga-XLX provides an interface that supports the connection of AC'97 digital
audio codecs. For more information about this interface consult the XTX Design Guide.
4.2.7 Extended System Management
conga-XLX has additional signals and functions to further improve power management.
One of these signals is an output signal called FAN_PWMOUT that allows system fan
control using a PWM (Pulse Width Modulation) Output. Additionally there is an input
signal called FAN_TACHOIN that provides the ability to monitor the system fan's RPMs
(revolutions per minute). This signal must receive two pulses per revolution in order to
produce an accurate reading. For this reason a two pulse per revolution fan, or similar
hardware solution, is recommended. These features are implemented by the Winbond
W83627HG super I/O.
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