Specifications

Chapter 3 Hardware
ReadyBoard 800 Reference Manual 45
Audio Interface (J4)
The audio solution on the ReadyBoard 800 is provided by the (Southbridge) I/O Hub (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 2.3 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 I/O Hub 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 1 Hz resolution
• Stereo (Left and Right) Line In
• Stereo (Left and Right) Line Out
• Microphone (mono) in
• PC "Beep" speaker signal is also fed to the CODEC for the Line Out (Left and Right) channels
Table 3-15 describes the Audio interface (J4) pin/signals on 16-pins, 2 rows, odd/even (1, 2) with
2 mm pin spacing.
Table 3-15. Audio Interface Pin/Signal Descriptions (J4)
Pin # Signal Description
1, 3 NC Not Connected
2, 4, 7, 8,
11, 12, 13,
14, 16
GND_AUD Audio ground
5 LINE_OUTL Line Out signal left channel
6 LINE_OUTR Line Out signal right channel
9 LINE_INL Line in signal left channel
10 LINE_INR Line in signal right channel
15 MICIN Microphone signal in
Note: The shaded area denotes power or ground.