User Guide

Baseband description

System module block diagram

The device consists of two different main modules: transceiver and UI. The transceiver board consists of

baseband and RF components. The UI board consists of key domes and keypad backlights. Connection

between the UI and the transceiver board is established via a board-to-board spring connector.

Note: In this description, the user interface HW covers display, camera, keyboard, keyboard

backlight and ALS.

Figure 35 System level block diagram

Baseband functional description

Digital baseband consists of an ISA (Intelligent Software Architecture) based modem and Symbian based

application sections. The modem functionality is in RAP, and the application processor acts as a platform for

Symbian applications. The terms ISA and Symbian are used refer to the software environment of these

devices.

The modem section consists of a RAP ASIC with NOR FLASH and SDRAM memory as the core. RAP supports

WCDMA and GSM cellular protocols. The modem DDR SDRAM memory has 128 Mbits of memory and NOR flash

has 128 Mbits of memory. RAP operates with the system clock of 38.4 MHz, which comes from the VCTCXO.

RA-6

System Module

Issue 1 COMPANY CONFIDENTIAL Page 6 –5