Benefon EXION TDP80DN, Service Manual

Page: 29 / 63

9.2.2001
4Z2700GB.fm 2
Product: TDP80DN / OC2720 Processor/Audio/RF
LOGIC / AUDIO
OC2720 Processor/Audio/RF
5.1 General description for the baseband
The baseband is built with DSP asic (Digital Signal Processor) made by VLSI.
All the functions are found within a single OC2700 board. The processor controls the
RF parts, internal devices and external accessories. The audio functions are done
with the DSP. The keyboard is situated on separate board and it is connected to
logic module with 10 pin connector. The keypad and display is illuminated with EL-
sheet.
5.2 DSP-processor
The DSP-processor performs all the baseband functions.
The chip includes VS_DSP processor, memory, an analog audio interface and a
variety of peripheral devices
- VS_DSP processor
- 64k x 16-bit data RAM
- 4k x 32-bit program RAM
- 4k x 32-bit program ROM
Peripheral devices:
- a 32-bit general IO port
- 2 RS232 serial ports
- LCD controller
- PLL (synthesizer) controller
- 450 kHz frequency counter
- a keyboard controller
- 8-bit interrupt IO port
- 6 timers (32-bit)
- synchronous serial port (SSP)