Toshiba TS605 Service Manual - Page 66

BASEBAND OVERVIEW, SIM Interface and Management

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MOBILE COMMUNICATIONS DIVISION CUSTOMER SERVICES 6.2 BASEBAND OVERVIEW 6.2.1 INTRODUCTION The baseband block of the handset performs the following functions: Equalization Channel coding / decoding Speech coding / decoding Data Encryption Layer 1, 2 and 3 software tasks Man Machine interface (MMI) System Interface SIM Interface and Management Audio and Tone Generation Power supply and battery management RF power control Synchronization Real time clock The baseband block is built from a GSM solution platform developed by Advanced Devices Inc. The solution platform contains two main chips. One chip (AD6527B) carries out signal processing functionality with integrated DSP and CPU; the other chip (AD6537B) contains analogue interfaces and power management circuitry. Both of them are very powerful and efficient due to its highly integrated nature of technology. Figure Baseband block diagram Version 1.0 22/11/2006 Created by Konrad Szombara Page 66 of 103

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MOBILE COMMUNICATIONS DIVISION
CUSTOMER SERVICES
Version 1.0 22/11/2006
Created by Konrad Szombara
Page 66 of 103
6.2 BASEBAND OVERVIEW
6.2.1 INTRODUCTION
The baseband block of the handset performs the following functions:
Equalization
Channel coding / decoding
Speech coding / decoding
Data Encryption
Layer 1, 2 and 3 software tasks
Man Machine interface (MMI)
System Interface
SIM Interface and Management
Audio and Tone Generation
Power supply and battery management
RF power control
Synchronization
Real time clock
The baseband block is built from a GSM solution platform developed by
Advanced Devices Inc. The solution platform contains two main chips. One
chip (AD6527B) carries out signal processing functionality with integrated
DSP and CPU; the other chip (AD6537B) contains analogue interfaces and
power management circuitry. Both of them are very powerful and efficient
due to its highly integrated nature of technology.
Figure
Baseband block diagram