BCM2121
®
GPRS/GSM SINGLE-CHIP BASEBAND PROCESSOR
FEATURES
•
Single 200-pin FBGA device (13 mm
×
13 mm)
•
GSM voice handset capabilities: FR/EFR/AMR/HR
•
Data capability (one to five slots, up to four RX/4 TX slots)
•
GPRS (multislot Class 10) up to 84.4 Kbps
•
HSCSD (multislot Class 10) up to 57.6 Kbps
•
GSM single slot up to 14.4 Kbps
•
Multivoltage SIM, PCMCIA, and IrDA compliant interfaces
•
GSM850, E-GSM900, GSM1800, and GSM1900 bands
SUMMARY OF BENEFITS
•
Comprehensive GPRS/GSM handset software
•
Layer 2/3 and user interface software
•
For bar-type and flip-type GPRS/GSM handsets
•
Multiple color LCD panels (black and white to 65K color)
•
Polyphonic ringer interface
•
Multicolored LED notifications/backlight
•
Type-approved Phase 2+ multiband protocol stack
•
Fully functional GSM handset user interface
•
Foreign language fonts, including Chinese
•
Startup animations, songs, games, and ring tones
•
Unicode SMS and full EMS messaging
•
SIM Application Toolkit (SATK)
•
Fully integrated Layer 1, including all drivers
•
AT commands (7.05 and 7.07)
•
Extremely low-power design: 3V I/O and 2V core
•
Three UART serial ports for data/fax/testing
•
Flexible RF transceiver control interface:
•
Integrated PA controller
•
APC DAC with ramping RAM
•
Support straight or multiplexed I and Q
•
Schedule-based programmable serial control
•
Power/cost-flexible audio circuitry
•
Noise suppression and echo cancellation for speakerphone and
car phone environments
•
Sidetone/microphone amplification control
•
High-output speaker driver
•
Flexible clock rates for processors (0 to 52 MHz)
•
•
•
•
Phase 2+ supplemental services
Error correction: Radio Link Protocol (RLP)
Compression: IP header for GPRS and V.42bis in all modes
Complete development system available
•
Real-time clock and alarm
GPRS/GSM Handset Terminal Using BCM2121
BCM2121
Protocol Processing,
Man-Machine
Interface
(ARM RISC)
Data
Terminal
Equipment
Keypad
SIM
Display 2
Flash
SRAM
Display 1
Physical Layer
Processing,
Speech CODEC,
Baseband CODEC
(Oak DSP)
RF
Transceiver
OVERVIEW
GPRS/GSM Handset Functional Block Diagram
BCM2121
Flash
SRAM
Keypad
LCD
SIM Card
PC/DTE
LEDs
Hands-
Free
External
Memory
Interface
32 kHz
XTAL
RAM
ROM
Timers
PLL
MMI
Drivers
and
Interface
- IrDA
- UARTs
- Ringing
- Charging
- Slow-serial
- Speakerphone
ARM7TDMI
RISC
Oak DSP
- Signal processing
- Speech algorithm
- Echo cancellation
- Noise suppression
Auxiliary Functions
ADC
MUX
Battery
Charger
13 MHz
- MMI
- Services
- GSM/GPRS
protocol stack
- Voice recording
- Voice recognition
AFC
DAC
PA Control
Hardware
Coprocessors
GMSK
Mod.
Digital RF Control
ADC
DAC
Quad
Mod.
VCO
Synth.
Down
Conv.
PA
Diplexer
Voice Band CODEC
DAC
Baseband CODEC
ADC
x
Transceiver
L
N
A
The
BCM2121
GPRS/GSM baseband processor offers a high level of
system integration, performance, and features for next-generation
handsets and radio cards. The
BCM2121
is a single-chip baseband
device that is applicable for wireless handsets and speakerphones.
The integration of the PA controller and speaker/car phone audio
circuitry adds key GPRS handset features while reducing overall system
cost.
The
BCM2121
contains all analog and digital GSM and multislot GPRS
baseband processing functions on a single silicon substrate. Interface
functions and drivers are integrated to enable auxiliary components such
as microphone, speaker, displays, keypad, data terminal equipment, and
SIM to connect directly to the chip. A flexible baseband control interface
supports a wide range of transceivers including GSM850, E-GSM900,
GSM1800, and GSM1900 frequency bands.
To accelerate our customers’ product development cycle and to enable
high-volume manufacturing, the
BCM2121
also offers handset system
solutions, including:
•
Complete handset and modem software, evaluation boards, reference
designs, and integration support
•
GSM Certification Forum (GCF) and interoperability testing (IOT)
•
Worldwide network field testing
To further reduce overall component count and BOM cost, the
BCM2121
integrates a number of typical PCB circuit functions such as
a PA controller, echo cancellation, noise suppression, and hands-free
answer sensing.
In addition, features such as the peripheral serial bus interface, integrated
1.8V/3V SIM, and multiplexed I and Q channels add flexibility when
connecting to other onboard components.
On-chip hardware accelerators work in concert with HSCSD and GPRS
software to allow user data speeds up to 57.6 Kbps and 84.4 Kbps. In
addition to these multislot capabilities, the
BCM2121
contains legacy
GSM voice circuitry (adding all of the AMR modes) for voice
applications. On the ARM, the V.42bis compression yields up to a 4×
rate increase for GPRS and HSCSD traffic.
The ARM7TDMI processor runs the high-level application software,
such as the SATK, WAP browser, voice recognition/recording, and user
interface. The processor can interface with various polyphonic ringer
chips and control two black and white or color LCD panels for high-end
handsets.
The Oak DSP performs the GSM physical layer functions, including
voice and baseband codecs, speech coding, channel coding and
interleaving, and RF interface transceiver control. To minimize power
consumption, the Oak DSP uses hardware coprocessors for computation-
intensive processing functions. Echo cancellation and noise suppression
software is also included on the DSP to target speakerphone and other
noisy environments.
Broadcom
®
, the pulse logo, and
Connecting everything
®
are trademarks of Broadcom Corporation and/
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
2121-PB03-R
11/13/03
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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