BCM2200 PRODUCT Brief BCM2200 B C M 2 2 0 0 SINGLE-CHIP S U M M A R Y F E AT U R E S * Dual Vector Orthogonal Frequency Division Multiplexing (VOFDM) Receivers with Integrated FEC * * * * * WIRELESS Up to 71 Mbps data rate Variable channel width up to 15 MHz Up to 1024 tones 4-, 16-, 64-, 256-QAM Channel estimation and acquisition O F MODEM B E N E F I T S VOFDM architecture specifically designed * Advanced for broadband wireless * High performance in time-varying multipath channels * Operates in non-line of sight environment for improved coverage * Supports dual antenna for spatial diversity * OFDM for frequency diversity OFDM Burst Transmitter * Integrated Up to 48 Mbps data rate downstream/upstream service up to 48 * Symmetric Mbps each way designed to improve performance in the wireless * MAC environment * * Variable channel width up to 15 MHz * Up to 512 tones * 4-, 16-, 64-QAM * Integrated Media Access Controller (MAC) for Wireless Applications * Supports enhanced Quality of Service (QoS) for Voice over IP (VoIP) applications * Support for fragmentation and concatenation * Support for 16 unicast destination addresses and 256 multicast address filters * Dedicated SID for closed loop power control * Inline 40/56 DES encryption/decryption for user data privacy * Locks 8 kHz subscriber voice clock to base station reference Interface * CPU BCM3310 Broadband Communications Processor * Enables high-speed full-service connection for data, voice and video * Provides statistical multiplexing on channel to increase effective capacity * Rapid RF power control to combat flat fading and crosstalk * Supports connection based isochronous telephony * Provides contention free data transmission * Enables network management to match transmission mode to deployment environment * Single-chip PHY/MAC * Reduces overall system cost * Simplifies system, board and software design * Reduces power consumption * * PCI Master * PowerPC 850 * Configurable microcontroller interface to support * 1.8V, 3.3V I/O * 320-pin BGA Package either full PCI bus master capability or interface to PowerPC and BCM3310 Broadband Communications Processor Wireless Modem Reference Design SDRAM FLASH DC Tx/Rx ODU Serial 1,2 ODU CTRL & STAT ODU BCM2200 IF Interface LO TCXO FLL CTRL IF AGC 2 ODU Rx ODU (optional) US DS Analog Module Up/Down Conversion D/A A/D A/D US Data DS Data VOFDM Rx OFDM Tx MAC BCM3310 Ethernet BCM5201 10/100BT XCVR USB USB RJ-45 B C M 2 2 0 0 O V E R V I E W BCM2200 Downstream From A/D FIR Filtering & Decim From A/D IF AGC CTRL SINR Metric Calc Channel Est Decoding & Deinterleaving Beamforming & Demod FFT Downstream Header Processor 2 AGC Message Processor Synch FLL CTRL ODU CTRL & STAT To D/A Downstream DES Modem SDRAM MAP Processor Controller FIR Filtering & Interp DMA and Memory Interface IFFT Encoding & Interleaving Upstream Upstream TDMA Controller Upstream Header Processor JTAG Interface Upstream DES CPU and PCI Interface The Broadcom(R) BCM2200 combines a VOFDM receiver, an OFDM burst transmitter and a full-featured MAC integrated into a single chip. The BCM2200 is the first single-chip modem designed specifically for broadband wireless applications. performs concatenated convolutional-RS encoding and then processes the data through an IFFT for OFDM transmission. On-chip smoothing filters pre-filter the data prior to sending to an external D/A. The downstream input channels are first finite impulse response (FIR) filtered to eliminate out of band energy. Frequency locked loop (FLL) and automatic gain control (AGC) and control signals are generated to ensure proper synchronization and set the received signal level. FFTs are calculated and provided to a channel estimation algorithm. Input FFT and channel estimation data are then combined in a patented spatial receiver combining algorithm that produces a single set of soft decision bits to be processe by the FEC decoder. A concatenated Viterbi-Reed Solomon FEC makes use of signal-to-interference-plus-noise metrics calculated from the OFDM signal to improve decoded BER performance. A MPEG-2 compliant stream is passed to the MAC downstream processor. The BCM2200 includes an integrated Media Access Controller (MAC). The MAC enables Quality of Service (QoS) features. This allows for time sensitive applications such as voice and video conferencing to coexist with other data traffic while meeting strict latency requirements. Several hardware functions support QoS requirements. These include 16 separate upstream queues, traffic prioritization, fragmentation, and concatenation. The MAC supports baseline privacy encryption and decryption, transmission sublayer support, a TDM/TDMA framer, and a scatter gather DMA interface. The MAC has also been enhanced to provide higher bandwidth upstream data capability and dedicated SIDs for high update rate power control. The burst transmitter interfaces to the MAC upstream processor and has the ability to process high-speed data up to 48 Mbps. The transmitter can operate with burst or continuous data. It The BCM2200 is designed for flexibility by including a microcontroller interface that can be operated as a PCI bus or as a microcontroller interface to the BCM3310 Broadband Communications Processor and PowerPC processors. Broadcom and the pulse logo are registered trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. For more information please contact us at: Phone: 949-450-8700, FAX: 949-450-8710 Email: info@broadcom.com Visit our web site at: www.broadcom.com (c) 2001 by BROADCOM CORPORATION. All rights reserved. 2200-PB01-R-4.23.01 BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013