3-36 Theory of Operation: Controller
3.2.5 Audio
The audio section of the Controller design consists of:
• TI AIC33 voice CODEC
• MAKO audio sub-block
3.2.5.1 TX Audio path
The TX audio paths begin with accessory microphone. There is one external microphone path going
to the main flex connector.
Figure 3-28. Audio TX Path Block Diagram
The external microphone path will be supported by the TI AIC33 CODEC, using the LINE1LP pin on
the IC. The LINE1LP is multiplexed with the MIC3R within the CODEC, and selected as the input
when the external microphone path is chosen as the TX audio source. The TI CODEC amplifies and
samples the external microphone signal. The digital data is sent to the OMAP1710's DSP through
the McBSP1 port using the audio SSI bus.
OMAP DSP
MAKO
Audio Stereo Codec (TI AIC33)
SSI
SSI
MCBSP1
VC_DCLK
VC_FSYNC
VC_TX
VC_RX
SSI
LEFT
ADC
RIGHT
ADC
DSP SPI
SPI
MIC BIAS
Reset Out
Reset
External/
Accessory
Microphone
I2C
I2C
Line 1L
Mic 3R
Mic 3L
4
1
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