User Guide

Baseband functional description

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

application sections. The modem functionality is in RAP3G, and OMAP 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 RAP3G ASIC with NOR FLASH and SDRAM memory as the core. RAP3G supports

cellular protocols of WCDMA (3GPP R-4) and GSM (EDGE class 10, GPRS phase2). The modem SDRAM memory has

64Mbits of memory and NOR flash has 64Mbits of memory. RAP3G operates with the system clock of 38.4 MHz,

which comes from the VCTCXO.

The application section includes an OMAP ASIC with DDR/NAND combo memory as the core. The OMAP ASIC uses

a 19.2MHz clock, which comes from the RAP3G divided by two from the 38.4 MHz system clock.

Figure 2 Functional block diagram

OMAP processor (Helen3 (OMAP1710)) is also called an application ASIC because it is processing application SW

and handles the UI SW. It consists of OMAP3.3 and peripheral subsystems such as camera, display and keyboard

driver blocks.

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