3.4.3
Audio
The analog audio stages are used exclusively for external accessories connected through the rear
DB25 accessory connector.
The critical components of the audio circuit are the TI DM8148 processor and a pair of Texas
Instruments AIC3204 dual channel audio codecs. Figure 10: Audio Block Diagram on page 52 details
the specific interconnects between the critical components.
Figure 10: Audio Block Diagram
TI DM8148
(DSP Core)
TI AIC3204
Audio
Codec 1
TI AIC3204
Audio
Codec 2
Rear Accessory Connector
(DB25)
I²C2 (2)
I²C0 (2)
Audio SSI (4)
TX Audio 1 (Pin 1 & 22)
RX Audio 1 (Pin 7)
TX Data (Pin 13)
RFIC SSI (4)
RX Audio 2
TX Audio 1
TX Data
TX Audio 2
RX Audio 1
The repeater digital audio is handled primarily by the DM8148 processor. The TX RFIC generates a
24.576 MHz master clock (MCLK) that the DM8148 uses to drive its McASP SSI interface for the audio
codecs. The bulk of the audio processing is done in the DaVinci’s DSP core. The audio codecs contain
DACs and ADCs and handle the conversion of the digital audio to analog audio and vice versa.
There are 2 TX audio lines routed in from the rear accessory connector. These are TX Audio 1 (Pins 1
and 22, used for analog and slot 1 digital), and TX Data (Pin 13).
For the RX outputs, there is only 1 which is connected to the accessory connector. RX Audio 1 on
pin 7 (to be used for analog and slot 1 digital).
3.5
Station Control Interface
3.5.1
Front Panel Interface Connector
Refer Modem Interface on page 66 for details.
3.5.2
Rear Panel Connections
Refer USB on page 69 to Auxiliary (Aux) on page 71 for details.
3.5.3
Power Amplifier Interface Connector
The digital interface to the power amplifier module utilizes a 20 pin vertical LIF connector. See
Figure 8: Modem Module Connector Locations on page 48 for the locations of these connectors. Figure
11: Power Amplifier Interface Connector Pin Locations on page 53 shows the pin number locations.
Chapter 3: SLR 5000 Series Modem
Motorola Solutions Confidential
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