AC97 and Touch Interface
12
AC97 Interface and Touch Controller
The PXA270 controller feataures an AC97 interface for controlling
sound decoders such as the WM9712L from Wolfson. The WM9712L
also has an integrated touch controller.
OUT
FF-UART
CAN
USB
HOST
USB
Client
Ethernet
POWER
BT-UART
IN
MIC
A
B
TOUCH
AC97
Figure 32: Sound and Touch Controller Interfaces
The sound decoder WM9712L is controlled via the controller's AC97
interface. The SDATA_IN0 is used as the input channel. The second
channel (SDATA_IN1) is available on the AC97 expansion socket at
X24. Connection to other AC97 devices such as modems is possible
via this socket.
Signal
A
B
Signal
VCC (3.3V)
1 2
VCC (3.3V)
/ENA_AC97
3 4
/ACRESET
SYNC
5 6
GND
BITCLK
7 8
GND
SDATA_OUT
9 10
GND
SDATA_IN0
11 12
GND
SDATA_IN1
13 14
GND
AC_INT
15 16
GND
Table 45:
AC97 Expansion Socket at X24
©
PHYTEC Meßtechnik GmbH 2006 L-668e_1
59
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