Baseband Description; System Module Block Diagram; Baseband Functional Description - Nokia N72 Service Manual

RM-180
System Module

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 hardware includes the following components: display,
camera, keyboard, keyboard backlight and ALS.

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 engine 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 the
GSM (EDGE class 10, GPRS phase2) cellular protocol. The modem SDRAM memory has 64Mbits of memory and
NOR flash has 64Mbits of memory. RAP operates with the system clock of 38.4 MHz, which comes from the
VCTCXO.
Issue 1
Figure 86 System level block diagram
COMPANY CONFIDENTIAL
Copyright © 2006 Nokia. All rights reserved.
Nokia Customer Care
Page 9 –7