Figure 3-28. Audio Tx Path Block Diagram - Motorola APX 3000 Detailed Service Manual

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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.
OMAP DSP
SSI
MCBSP1
Reset Out
DSP SPI
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.
SSI
VC_DCLK
VC_FSYNC
VC_TX
VC_RX
Audio Stereo Codec (TI AIC33)
SSI
I2C
I2C
Reset
SPI

Figure 3-28. Audio TX Path Block Diagram

MAKO
MIC BIAS
Line 1L
LEFT
ADC
Mic 3R
RIGHT
ADC
Mic 3L
Theory of Operation
: Controller
1
External/
Accessory
Microphone
4