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5.2. Baseband Overview
The Baseband circuits of the phone are required to perform the following functions:
8
Equalisation
8
Channel coding / decoding
8
Speech coding / decoding
8
Data Encryption
8
Layer 1, 2 and 3 software tasks
8
Man Machine interface (MMI)
8
System Interface
8
SIM Interface and Management
8
Audio and Tone Generation
8
Power supply and battery management
8
RF power control
8
Synchronisation
8
Real time clock
Figure 5.5. Baseband Block Diagram
The EB-X300 Baseband is built around a GSM chipset developed by Advanced Device. GSM processor U101 carries out signal
processing with DSP and CPU while U201 provides the analogue interface.
5.2.1. Introduction
U101
GSM Digital
Baseband
Processor
Keyboard
R.F. Block
BBCLK
Vibrator
U102
Memory
Flash/SRAM
(128MB/32MB)
RTC
Crystal
MIC
Speaker
SIM
Socket
Keypad Data Bus
CLKIN
OSC
32.768 kHz
Data Bus
Address Bus
LCD Control Bus
A,B,C Serial Port
RF Control Bus
GPIO4
USC Data Bus
SIM Interface
VCC
VBAT
VMEM
TXIQ
RXIQ
Control Signal
VMEM
Handfree Input
HANDFREEIN
GPIO34
Receiver
VMEM
VRTC
VSIM
Buffer
VVCXO
26MHz_BB
VOUTNOR P/N
3 in 1
Phone
Jack
VOUTAUX P
LOUD
VINNO R P/N
VINAUX P/N
TX/RX
TX/RX
Analogue
Switch
Voice
Data
GPIO2
AIN1P/1N
AOUT1P/1N
AIN2P/2N
AOUT3P
AOUT3N
U201
GSM Analogue
Baseband and
Codec & Power
Management
EXTPWR
Li-Ion
Battery
3 in 1
Power
Jack
Over Voltage
Protect Circuit
PMOSFET
Charging
Circuit
VBAT
VCORE
VMEM
VEXT
VSIM
VRTC
VABB
VVCXO
VMIC
RTC
Battery
PJ_FUNC_SEL
PJ_FUNC_SEL
VCORE
VVCXO
VEXT
VMEM
VSIM
VRTC
VABB
VMIC
Backlight
LED
BACKLIGHT
VBAT
LIGHT 1/2/3
MA3
U401
AIT800G
CMOS
CAMERA
LCD Module