BeagleBoard XM C2, Reference Manual

Page: 87 / 163

REF: BB_SRM_xM
BeagleBoard-xM System
Reference Manual
Revision C2
Page 87 of 163
7.16.2 TPS65950 Audio Interface
The
TPS65950 acts as a master or a slave for the I2S interface. If the TPS65950 is the
master, it must provide the frame synchronization (I2S_SYNC) and bit clock (I2S_CLK)
to the processor. If it is the slave, the
TPS65950 receives frame synchronization and bit
clock. The TPS65950 supports the I2S left-justified and right-justified data formats, but
doesn’t support the TDM slave mode
.
In
Table 13 are all the signals used to interface to the processor.
Table 13. Processor Audio Signals
Signal Name Description I/O Pin
I2S.CLK Clock signal (audio port) I/O L3
I2S.SYNC Synchronization signal (audio port) IO K6
I2S.DIN Data receive (audio port) I K4
I2S. DOUT Data transmit (audio port) O K3
CLK256FS Synchronization frame sync to the PROCESSOR O D13
A new feature on the –xM is the ability to access the audio signals for use on an external
add on board. If this feature is to be used, you must disable via SW this interface on the
TPS65950.
7.16.3 Audio Output Jack
A single 3.5mm jack is provided on BeagleBoard to support external stereo audio output
devices such as headphones and powered speakers. This interface is not amplified and
may require the use of amplified speakers in certain instances.
7.16.4 Audio Input Jack
A single 3.5mm jack is supplied to support external audio inputs including stereo or
mono. If a microphone is o be used, it may require additional amplification of the signal
for proper use.