RCA RDR9000, Service Manual

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Service Manual 3. Baseband Section
7
3.2 Control Section
The control platform is composed of two OMAP-L138 processors for the repeater unit and the
MCU for the control head. The OMAP-L138 processor has a dual-core architecture which
incorporates an ARM926EJ-S core and a TMS320C674x DSP core. ARM926EJ-S is the main
controller, while TMS320C674xDSP is used for modulation/demodulation and voice
encoding/decoding. OMAP-L138 has powerful processing capacity at the maximum of 375
MHz operating frequency. Multiple interfaces are available on the processor for connecting to
various peripherals. Two OMAP-L138 processors allows parallel processing of TX/RX control
and data processing, provides powerful data processing and relay capacity, which ensures
high-speed service replay.
The MCU for the front panel is an ARM Cortex-M3 core and it works with a SDRAM memory
and a flash memory to control key operation, external data interface, and LCD display.
DC-DC and LDO regulators are adopted to generate appropriate power supply to the
hardware platform. The Class AB BTL amplifier is used to amplify the output audio signal.
3.2.1 Major Features

Sleep and system clocks

NOR flash and mobile DDRAM interface

LCM interface

PLL interface

IF processor interface

DAC interface

RTC interface

GPS interface

Bluetooth interface

Keypad interface

Tuning interface

GPIO interface

MAC interface

Audio input and output interface

Option board interface

Front panel interface