BCM3348 Broadcom, BCM3348 Datasheet - Page 2

• Manufacturer Part Number: BCM3348
• Description: QAMLINK HIGH PERFORMANCE SINGLE CHIP CABLE MODEM
• Manufacturer: Broadcom

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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
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.
Broadcom
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
Ethernet
Coaxial
®
10/100
receiver
, the pulse logo, PROPANE
cable
USB
supports
Isolation
Isolation
DiPlexer
Silicon
Tuner
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TM
, QAMLink
®
variable
QPSK-256-QAM
16–1024-QAM
B C M 3 3 4 8
Transceiver
Demodulator
Amplifier
®
, and Connecting everything
Ethernet
Advanced
Power
Advanced
Modulator
Filter
symbol
Peripheral
Logic
Convergence
Transmission
Ethernet
Module
MAC
rate
®
O V E R V I E W
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
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.
DA perfect-match
MAC
USB
DOCSIS 2.0
Module
MAC
100-MHz
SDRAM
Interface
SDRAM
64-MB
16-bit
MIPS32 Core
BCM3348
100-MHz ISB
with MMU
200-MHz
I/D Cache
8/8-KB
filters,
EBI/PCMCIA
Expansion
FLASH
Module
8-MB
SPI
I/F
a
256-entry
Email: [e-mail]
Web: www.broadcom.com
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Phone: [phone]
FAX: [phone]
(optional)
FLASH
Serial
CAM
for
4U
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