Filter
Top Products
PXA250 and PXA210 Applications Processors Design Guide 6-1
AC97 6
The AC97 controller unit (ACUNIT) connects audio chips and codecs to the applications
processor. It uses a six-wire interface to transmit and receive data from AC97 2.0 compliant
codecs. The AC97 port is a bidirectional, serial PCM digital stream. A maximum of two codecs
may be connected to the ACUNIT.
6.1 Schematics
The schematics for an AC97 connection are shown in Figure 6-1. The primary codec supplies the
12.288 MHz clock to the AC97. This clock is then driven into the ACUNIT on the applications
processor and the AC97 Secondary Codec.
Figure 6-1. AC97 connection
nACRESET
SDATA_OUT
SYNC (48KHz)
SDATA_IN_0
BITCLK (12.288MHz)
SDATA_IN_1
PXA250
AC97
Controller
AC97
Primary
CODEC
AC97
Secondary
Codec