Nokia N-GAGE 服务手册

Nokia

NEM-4

Company Confidential

7 - Baseband

Nokia Customer Care

Page 7-2

Copyright © 2004 Nokia Corporation.

Issue 2 09/2004

Company Confidential

Table of Contents

Page No

List of Abbreviations ..................................................................................................... 4
NEM-4 Block Diagram .................................................................................................. 6
Baseband Technical Summary....................................................................................... 6
Functional Description ................................................................................................... 7

BB description .............................................................................................................7

Memory configuration............................................................................................... 7
Energy management .................................................................................................. 8

Modes of operation ......................................................................................................8

Voltage limits ............................................................................................................ 8

Clocking scheme ..........................................................................................................9

UPP_WD2 voltage/clock frequency adjusting.......................................................... 9

Power distribution, control and reset .........................................................................10

Power-up sequence (reset mode)............................................................................. 10
Powering off ............................................................................................................ 10
Uncontrolled powering off ...................................................................................... 11
Watchdogs ............................................................................................................... 11
Charging .................................................................................................................. 11
Chargers .................................................................................................................. 11
Battery ..................................................................................................................... 11

Back-up battery and real time clock ..........................................................................11
Baseband measurement A/D converter .....................................................................11

ZOCUS......................................................................................................................... 12
NEM-4 BB Features, HW Interfaces and User Interface............................................. 12

Display and keypad ....................................................................................................12
Bluetooth ....................................................................................................................12
SIM interface .............................................................................................................12
MMC interface ...........................................................................................................13
NEM-4 audio concept ................................................................................................13

ADSP....................................................................................................................... 13
Audio routing and conditioning .............................................................................. 14
FM radio play .......................................................................................................... 14
FM radio/line in recording ...................................................................................... 14
MP3/AAC playback ................................................................................................ 14
GSM audio handsfree mode .................................................................................... 14
Standard ringing tones / alarm tones ....................................................................... 15
MP3/AAC/MIDI ringing tones ............................................................................... 15
MultiMediaCard MMC ........................................................................................... 15
ADSP flash memory................................................................................................ 15
Acoustics ................................................................................................................. 15
Earpiece ................................................................................................................... 15
Microphone ............................................................................................................. 15
Loudspeaker ............................................................................................................ 15
Headset .................................................................................................................... 16
FM radio .................................................................................................................. 16

Flashing ......................................................................................................................16
Testing interfaces .......................................................................................................17
Extreme voltages ......................................................................................................18