Audio Interface (J4); Table 3-15. Audio Interface Pin/Signal Descriptions (J4) - Ampro ReadyBoar 800 Reference Manual

Chapter 3

Audio Interface (J4)

The audio solution on the ReadyBoard 800 is provided by the Southbridge (82801DBM) and the on-
board Audio CODEC (ALC202A). These two chips use a digital interface to communicate between the
two, which is defined by AC'97 and is revision 2.2 compliant. The input or output signals for the audio
interface go through the 16-pin connector (J4) to an external cable and/or board, which has the
respective audio connections. The PC Beep Speaker signal from the Southbridge is also fed to the on
board Audio CODEC to provide a PC Beep signal for the stereo line out connections.
Audio CODEC (ALC202A) features
• AC'97 Rev 2.3 compliant
• 18-bit full duplex performance
• Variable sampling rate at 1Hz resolution
• Stereo (Left and Right) Line In
• Stereo (Left and Right) Line Out
• Microphone (mono) in
• PC Beep speaker also fed to CODEC for signal to the Line Out (Left and Right) channels

Table 3-15. Audio Interface Pin/Signal Descriptions (J4)

Pin # Signal
1 SpkR
3 SpkL
2, 4, 7, 8, GND_AUD Audio ground
11, 12, 13,
14, 16
5 LINEOUTL
6 LINEOUTR
9 LINE_IN_L
10 LINE_IN_R
15 MICIN
Notes: The shaded area denotes power or ground.
46
Description
Speaker out right channel
Speaker out left channel
Line Out signal left channel
Line Out signal right channel
Line in signal left channel
Line in signal right channel
Microphone signal in
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ReadyBoard 800