bcm3381 Broadcom Corp., bcm3381 Datasheet - Page 2

• Manufacturer Part Number: bcm3381
• Description: Bcm3381 - Integrated Docsis 2.0 Single-chip Channel Bonded Cable Modem
• Manufacturer: Broadcom Corp.

The BCM3381 is the industry’s first integrated, single-chip channel-
bonded cable modem solution, delivering over 100 Mbps data rates.
When used with Broadcom’s silicon tuner solutions, the resulting channel-
bonded modem does not have additional limitations on channel location,
modulation parameters, or power levels, enabling maximum flexibility for
channel bonding. Additionally, with advanced integration, the BCM3381
requires no costly FPGA or external logic to implement DOCSIS channel
bonding. DOCSIS 2.0-compliant, the BCM3381 is interoperable on
today’s networks, and supports channel bonding with existing CMTS
hardware enabling immediate deployment.
The BCM3381 combines RF receivers with advanced QAM and S-CDMA
demodulators, an advanced QAM transmitter, a complete DOCSIS 2.0+
Media Access Controller (MAC) with channel-bonding capability, an
800-DMIPS communication processor, a 16-bit 133-MHz DDR266
DRAM interface, a 10/100 Ethernet MAC with integrated transceiver, and
a USB 2.0 device.
The QAM receivers directly sample tuner output with an 11-bit ADC 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, 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 BCM3381 channel-bonding MAC includes all features required for
full DOCSIS 1.0, 1.1, and 2.0 compliance, including full support for
Broadcom
QAMLink
and/or its affiliates in the United States, certain other countries and/or the EU. Any other trademarks or
trade names mentioned are the property of their respective owners.
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
3381-PB01-R
®
®
, TurboQAM™, and SmartSpectrum™ are among the trademarks of Broadcom Corporation
, the pulse logo, Connecting everything
07/26/06
DOCSIS QAM In
DOCSIS QAM In
DOCSIS QAM In
US Out
®
2Gs Power
DAC Array
PNP
1.2V
Vreg
®
, the Connecting everything logo, Propane™,
Demodulator
16-1024 QAM
Demodulator
16-1024 QAM
Demodulator
16-1024 QAM
Modulator
256 QAM
QPSK-
Vreg
PNP
2.5V
BCM3381 Block Diagram
27-MHZ Xtal
Generation
O V E R V I E W
Clock
50-MHz UBUS
16 SID with
2.0+ MAC
TX Conv
DOCSIS
Channel
Bonding
Module
Module
UART
baseline privacy (BPI+) encryption and decryption. To enhance
operational support, the BCM3381 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 BCM3381 device’s expansion capabilities enable a wide range of
peripheral functionality, including VoIP, wireless, or 1000 Mbps Gigabit
Ethernet connectivity, as well as any other PCI peripheral.
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 which 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) which provides up to a 2 dB RF signal gain.
Secondly, certified Propane packet accelerator technology delivers
enhanced efficiency with DPHS (Dynamic Payload Header Suppression),
which increases upstream payload capacity by up to three 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 delivers an over 30% performance increase.
The BCM3381 pinout has been optimized to allow for small, low-cost
channel-bonded cable modem solutions. Without the need for an FPGA or
external logic to support channel bonding, and the incorporation of an
upstream power amplifier, the BCM3381 allows a complete high-speed
channel-bonded cable modem to be assembled with a minimal set of
external components.
SPI
Periph
Serial
Flash
Logic
IEEE 802.3u
Isolation
Ethernet
Ethernet
FPM with
32-KB
SRAM
PHY
MAC
Isolation
USB 2.0
USB
2.0
16-KB TO
32-KB TI
D-Cache
I-Cache
16-KB
MPI PCI/EBI
PCI/EBI
MIPS4350
Processor
133-MHz UBUS
Flash
16-bit DDR
16-bit DDR
Controller
(DDR266)
133-MHz
133-MHz
UBUS
BCM3381
Secure
Boot
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com