BCM2121
GPRS/GSM SINGLE-CHIP BASEBAND PROCESSOR
GPRS/GSM Handset Terminal Using BCM2121
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
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)
Real-time clock and alarm
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)
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
F E A T U R E S
S U M M A R Y O F B E N E F I T S
SIM
Keypad
Data
Terminal
Equipment
Protocol Processing,
Man-Machine
Interface
(ARM RISC)
Physical Layer
Processing,
Speech CODEC,
Baseband CODEC
(Oak DSP)
RF
Transceiver
BCM2121
Flash
SRAM
Display 1
Display 2
O V E R V I E W
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
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
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.
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.
GPRS/GSM Handset Functional Block Diagram
BCM2121
Oak DSP
- Signal processing
- Speech algorithm
- Echo cancellation
- Noise suppression
Flash
Hardware
Coprocessors
Voice Band CODEC
Baseband CODEC
GMSK
Mod.
Timers
PLL
Auxiliary Functions
MUX
ADC
Down
Conv.
Transceiver
AFC
DAC
13 MHz
Battery
Charger
DAC
ADC
DAC
ADC
Quad
Mod.
VCO
Synth.
PA
SRAM
RAM
ROM
PA Control
Digital RF Control
LCD
Keypad
SIM Card
LEDs
PC/DTE
Hands-
Free
External
Memory
Interface
MMI
Drivers
and
Interface
- IrDA
- UARTs
- Ringing
- Charging
- Slow-serial
- Speakerphone
ARM7TDMI
RISC
- MMI
- Services
- GSM/GPRS
protocol stack
- Voice recording
- Voice recognition
L
N
A
x
Dip
l
e
x
e
r
32 kHz
XTAL
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