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BCM3348KPB Datasheet(PDF) 2 Page - Broadcom Corporation. |
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BCM3348KPB Datasheet(HTML) 2 Page - Broadcom Corporation. |
2 / 2 page The BCM3348 combines an RF receiver with an advanced QAM and S-CDMA demodular, an advanced QAM transmitter, a complete DOCSIS 2.0 Media Access Controller (MAC), a 200-MHz MIPS32™ communication processor, a 16-bit, 100-MHz SDRAM interface, 10/100 Ethernet MAC with integrated transceiver and MII Interface, and a medium-speed USB 2.0 controller with integrated transceiver. The QAM receiver directly samples a tuner output with a 11-bit A/D converter and input ACG amplifier. The receiver digitally resamples and demodulates the signal with recovered clock and carrier timing, filters and equalizes the data and passes soft decisions to an ITU-T J.83 Annex A/B/C compatible decoder. The receiver supports variable symbol rate 4/16/32/64/128/256/512/1024-QAM FEC decoding. The final received data stream is delivered in a serial MPEG-2 transport format. All gain, clock, and carrier, acquisition and tracking loops are integrated in the QAM receiver. The upstream transmitter takes burst or continuous data, provides FEC encoding and pre-equalization for DOCSIS applications, filters and applies 2/4/8/16/64/128/256-QAM or S-CDMA, modulation to the data stream, amplifies the signal through the integrated upstream power amplifier and provides a direct 0–65 MHz analog output. The BCM3348 Media Access Controller (MAC) includes all features required for full DOCSIS 1.0, 1.1 and 2.0 compliance, including full support for baseline privacy (BPI+) encryption and decryption. Single-user support includes 4 SIDS in downstream, 4 DA perfect-match filters, a 256-entry CAM for multicast/unicast hash filter, and 4 independent upstream queues for simultaneous support of QoS and BE traffic. To enhance operational support, the BCM3348 MAC provides extended network management MIB/diagnostic features, as well as immediate UCC (on-the-fly) using independent resets for downstream and upstream and both individual queue reset/flush for upstream queues. The BCM3348 uses advanced PROPANE techniques to provide packet acceleration to significantly improve upstream channel utilization. With the incorporation of an upstream power amplifier, the BCM3348 allows a complete cable modem to be assembled with a minimal set of external components. When used with the silicon tuner, the BCM3348 offers the lowest-price solution for a high performance, single-user DOCSIS 2.0 cable modem. BCM3348 OVER VIEW 100-MHz ISB Ethernet MAC USB MAC EBI/PCMCIA Expansion Module 16-bit SDRAM Interface Transmission Convergence Module Silicon Tuner Coaxial cable DiPlexer USB 10/100 Ethernet Isolation 64-MB 100-MHz 8-MB FLASH SDRAM DOCSIS 2.0 MAC Module Peripheral Logic 200-MHz MIPS32 Core with MMU 8/8-KB I/D Cache Advanced Modulator QPSK-256-QAM Advanced Demodulator 16 –1024-QAM Power Amplifier Filter Ethernet Transceiver BCM3348 Isolation SPI I/F Serial FLASH (optional) ® Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com Broadcom®, the pulse logo, PROPANETM, QAMLink®, and Connecting everything® are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners. BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 © 2002 by BROADCOM CORPORATION. All rights reserved. 3348-PB02-403-R 11.26.02 |
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