Figure 3-29. Cpld Block Diagram - Motorola APX 1000 Detailed Service Manual

Theory of Operation
: Controller
OMAP 1710
Processor
3.2.5 Audio
The audio section of the Controller design consists of:
• TI AIC33 voice CODEC
• TI TPA2034D1 class-D audio power amplifier
• MAKO audio sub-block
3.2.5.1 TX Audio path
The TX audio paths begin with three microphones. There are two internal microphones and one
external microphone path going to the GCAI connector.
The internal microphone paths start with two microphones that are embedded within the radio. Both
of the microphones are biased with a 4.7 V supply that is generated by the MAKO IC. This supply is
solely dedicated to biasing the microphones. The microphone signals are AC coupled into the 16 bit
TI AIC33 stereo CODEC on the MIC3R and MIC3L input pins. The TI AIC33 CODEC allows both
microphone signals to be amplified, and simultaneously sampled and converted into digital data. The
data is sent to the OMAP1710's DSP through the McBSP1 port where the DINC (dual input noise
canceller) can process the data for both microphones and provide a high level of noise suppression.
The digital data is sent to the OMAP1710 through the audio SSI (synchronous serial interface) bus
where the MAKO IC is used as the interface's clock and frame sync generator.
MAKO
F2 Select
F2 Timer
KEYLD_MISSING
GCAI GPIO0

Figure 3-29. CPLD Block Diagram

24MHz
CPLD
EMIFS
KL_SWITCH
3-39
32kHz to GPS
32kHz to OMAP
GPIOs
GPIs