User Guide

WLAN BB/MAC

The baseband chip implements OFDM/CCK digital baseband processor and ARM9-based MAC with internal

SRAM memories.

MAC core implements basic IEE802.11 functions. IEEE802.11e/i protocol extensions are included to implement

quality of service (QoS) and security functions.

Dedicated hardware accelerator is included for security functions (WEP and AES). Firmware and configuration

parameters are downloaded from the host after power-up.

Regulators

Switching stepdown regulator generates the MAC/BB digital core supply at 1.2 V. The 2.5 V output can be

further fed to inputs of the LDOs.

Two separate LDOs at 1.8 V output supply the VCO and the transceiver. The main 1.8 V supply is used for

transceiver analog parts, ADC/DAC and digital circuits inside the transceiver.

LDO at 2.8 V supplies PA bias current-mode DAC and RFMD PA bias circuits.

IrDA

IrDA specifies a reliable, fully digital peer-to-peer data link between IrDA units at data rates from 9600 bits/

s to 115 kbit/s. The link is based on the serial transmission of data as pulses of infra red light at the wave

length of 870nm and angles of +-15degrees at the range 0 - 100 cm.

SIM interface

The device has one SIM (Subscriber Identification Module) interface. It is only accessible if battery is removed.

The SIM interface consists of an internal interface between RAP and EM ASIC (N2200), and of an external

interface between N2200 and SIM contacts.

The SIM IF is shown in the following figure:

RM-49

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