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

© 2004 by BROADCOM CORPORATION. All rights reserved.

3349-PB01-R

9/7/04

or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the

property of their respective owners.

The BCM3349 combines an RF receiver with an advanced QAM and

S-CDMA demodulator, 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 USB

MAC 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 MHz – 65 MHz analog output.

The BCM3349 MAC includes all features required for full DOCSIS/

EuroDOCSIS 1.0, 1.1 and 2.0 compliance, including full support for

baseline privacy (BPI+) encryption and decryption. Single-user support

includes six SIDs in downstream, four DA perfect-match filters, a 256-

entry CAM for multicast/unicast hash filter, and 16 independent

upstream queues for simultaneous support of QoS and BE traffic. To

enhance operational support, the BCM3349 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 queues reset/flush for upstream queues.

Enhanced end-to-end 2.0+ features increase overall performance and

robustness. First, SmartSpectrum is a suite of technology that delivers

increased noise immunity and improved performance in noisy

conditions. SmartSpectrum includes Hi-PER SCDMA (High Power

SCDMA) mode for highly attenuated connections, BPSK modulation

that delivers a 3 dB gain in poor plant connectivity, Impulse Noise

Mitigation to reduce packet error rate caused by impulse noise, and

Trellis Coding (TCM-TDMA) that provides up to a 2 dB RF signal gain.

Second, certified Propane packet accelerator technology delivers

en hanced effici ency wit h DPHS (D yn amic P aylo ad Header

Suppression), which increases upstream payload capacity by up to 3

times, and Sync-TDMA (Synchronous TDMA), which increases

capacity with a smaller preamble.

Lastly, Broadcom’s TurboQAM technology significantly increases

overall performance of the system. 1024 QAM downstream and 256

QAM ATDMA upstream deliver an over 30% performance increase.

The BCM3349 pinout has been optimized to allow an ultra low-cost

2-layer PCB. With the incorporation of an upstream power amplifier and

Ethernet PHY, the BCM3349 allows a complete cable modem to be

assembled with a minimal set of external components. When used with

the BCM3419 silicon tuner, the BCM3349 offers the most cost-effective

solution for a high- performance, single-user DOCSIS 2.0 cable modem.

100MHz ISB

Ethernet

MAC

USB

MAC

EBI/PCMCIA

Expansion

Module

16-bit

SDRAM

Interface

Transmission

Convergence

Module

BCM3419

Coax

DiPlexer

USB

10/100

Ethernet

Isolation

64 MB

100 MHz

SDRAM

8 MB

FLASH

DOCSIS 2.0

16 SID

MAC

Module

Peripheral

Logic

200 MHz

MIPS32 Core

(250 mips)

8/8 KB

I/D-Cache

Advanced

256QAM

Modulator

Advanced

1024QAM

Demodulator

Power

Amplifier

Filter

Ethernet

Transceiver

BCM3349

Isolation

SPI

I/F

Serial

Flash

(opt)

1.2V

Regulator

2.5V

Regulator

PNP

PNP