BCM3349 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – ADVANCED QAMLINK® DOCSIS-R 2.0 HIGH-PERFORMANCE, SINGLE-CHIP CABLE MODEM

OVERVIEW
USB
Isolation
64 MB
100 MHz
SDRAM
8 MB
FLASH
10/100
Ethernet
Isolation
Ethernet
Transceiver
Ethernet
MAC
USB
MAC
16-bit
SDRAM
Interface
EBI/PCMCIA
Expansion
Module
Coax
DiPlexer
BCM3419
Power
Amplifier
Peripheral
Logic
100MHz ISB
Filter
Advanced
256QAM
Modulator
Advanced
1024QAM
Demodulator
Transmission
Convergence
Module
DOCSIS 2.0
16 SID
MAC
Module
BCM3349
200 MHz
MIPS32 Core
(250 mips)
SPI
I/F
8/8 KB
I/D-Cache
2.5V
Regulator
1.2V
Regulator
Serial
Flash
(opt)
PNP
PNP
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
enhanced efficiency with DPHS (Dynamic Payload 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.
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®
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
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Web: www.broadcom.com