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O V ERVI EW ® 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 32 kHz XTAL |
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