User Guide

Figure 53 System level block diagram

Baseband functional description

Digital baseband consists of ISA based modem and application sections. Modem functionality is in RAPGSM

ASIC.

The modem section consists of RAPGSM ASIC and NOR Flash and DRAM memory as the core. NOR Flash and

DRAM memories are in one package (Combo) RAPGSM supports cellular protocols of GSM (minimum EDGE glass

10, GPRS phase2). Modem DRAM memory has 128Mbits of memory and NOR flash has 256Mbits of memory.

RAPGSM operates with the system clock of 38.4 MHz, which comes from the VCTCXO.

RM-198

Nokia Customer Care System Module

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