BCM3345 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – QAMLINK HIGH PERFORMANCE SINGLE CHIP CABLE MODEM

BCM3345 OVERVIEW
Coax
802.3u MII
100BASE-TX
USB 1.1
RF
Tuner
Filter
IF
Tuner Ctl
10/100Mb Enet
Transceiver
USB 1.1
Transceiver
Upstream
Power
Amp
QPSK/16QAM
Upstream
Modulator
64/256QAM
Downstream
Demodulator
802.3u
Ethernet
MAC
USB 1.1
MAC
DOCSIS/
EuroDOCSIS
1.0/1.1
MAC
with BPI+
Peripheral Bus
PB
Bridge
Clock
Generation
8KB
I-Cache
JTAG
4KB
D-Cache
BCM3345
140-MHz
MIPS32 Core
with MMU
100MHz
Internal
System
Bus
16-bit
SDRAM
Interface
16-bit
Flash
Interface
DMA
Interrupt
Control
GPIO
UART
Timers
4-MB
FLASH
LEDs/
Misc
The BCM3345 combines an advanced QAM receiver; an
advanced QAM transmitter; a complete DOCSIS/EuroDOCSIS
Media Access Controller (MAC); a 140-MHz MIPS32
communication processor; a 16-bit, 100-MHz SDRAM
interface; 10/100 Ethernet MAC with integrated transceiver and
MII interface; and a USB 1.1 controller with integrated
transceiver.
The QAM receiver directly samples a tuner output with a 10-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. A
40-tap adaptive decision feedback equalizer is implemented.
The receiver supports variable symbol rate 64/256 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/EuroDOCSIS
applications, filters and applies QPSK or QAM16 modulation to
the data stream, amplifies the signal through the integrated
upstream power amplifier, and provides a direct 0–65 MHz
analog output.
64-MB
100-MHz
SDRAM
The BCM3345 Media Access Controller (MAC) includes all the
features required for full DOCSIS/EuroDOCSIS 1.0/1.1
compliance, including full support for baseline privacy (BPI+)
encryption and decryption. Single user support includes four
SIDS in downstream, four DA perfect match filters, a 64-entry
CAM for multicast/unicast hash filter, and four independent
upstream queues for simultaneous support of QoS and BE traffic.
To enhance operational support, the BCM3345 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 BCM3345 uses advanced Propane
techniques to provide packet acceleration to significantly
improve upstream channel utilization.
With the incorporation of an upstream power amplifier, the
BCM3345 allows a complete cable modem to be assembled with
a minimal set of external components. When used with the
silicon tuner, Broadcom offers the lowest price solution for a
high-performance, single user Cable Modem.
Ordering information:
BCM3345KPB
DOCSIS/EuroDOCSIS applications
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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.
3345-PB03-403-R 11.22.02
Phone: [phone]
FAX: [phone]
Email: [e-mail]
Web: www.broadcom.com