Microcontroller
2W/
4W
Hybrid
POTS
Splitter
BPF
AMP
AGC
BPF
Backplane
Interface
Microcontroller
BPF
AGC
2W/
4W
Hybrid
POTS
Splitter
10BASE-T
To
RJ-45
AMP
BPF
Protocol
ASIC
Extended
Interleave RAM
Extended
Interleave RAM
BCM6020
BCM6020
Operates up to 52 Mbps fully symmetric
Supports symmetric and asymmetric services
Operates on shielded and unshielded distribution
cables
Suitable for CO, HDT, ONU, and CPE applications
Small size and low power enables high port densities
Simple spectrum control via register programming
Supports frame-based and cell-based transport
streams
B C M 6 0 2 0
S C A L A B L E D S L T R A N S C E I V E R
Central Office Linecard Block Diagram
Customer Modem Block Diagram
BCM6020
Application Example
S U M M A R Y O F B E N E F I T S
The Broadcom BCM6020 is a single-chip QAM,
twisted-pair, scalable, DSL transceiver optimized for
low-cost, low-power and high-density applications on
both shielded and unshielded telephone wiring.
General
Supports bit rates to 52 Mbps and baud rates to
13 Mbaud
Less than 1 watt power consumption
Integrated carrier and clock recovery loops for ease
of use
Programmable 4-256 QAM constellations
Single 3.3 V supply operation
On-chip A/D and D/A converters
On-chip clock generation
Adjustable upstream and downstream center
frequencies
Extensive power management features
JTAG test interface
Small 100-pin PQFP form factor
Transport interfaces
Complete ATM UTOPIA Level 1 and 2
Rate matching and cell delineation
Bit-synchronous or byte-synchronous modes
Programmable frame formats
Coded/Uncoded payload support
Transceiver
Transmit notching for amateur radio band compatibility
On-chip and off-chip RAM interleaving
Reed-Solomon FEC
Packet scrambling
Digital square root Nyquist filters
Tomlinson precoder
x/sinx transmit pre-emphasis
Enhanced adaptive decision feedback equalizer
B C M 6 0 2 0 F E A T U R E S
PRODUCT
Brief
B C M 6 02 0
B C M 6 0 2 0 O V E R V I E W
The BCM6020 is the first single-chip VDSL solution to offer
support for unshielded telephone distribution cable through the
use of on-chip advanced digital filtering, precoding, and
equalization techniques. The BCM6020 offers DSL system
vendors an unmatched capability for the provision of high-speed
data transmission services on twisted-pair copper wire
supporting applications such as Internet access, LAN extensions,
work-at-home, remote-office, and switched digital video. Rates
of up to 52 Mbps are supported fully symmetric. The BCM6020
can also be configured to support full-speed ADSL and G.Lite
data rates.
The BCM6020 has been designed for any digital subscriber line
application where low-cost, low-power and compact size are
paramount. It is especially suited for use in frame-based
applications such as Ethernet transport and bridging over long-
reach telephone-grade wiring. Spectral compatibility is assured
by virtue of its programmable center frequency and baud rate.
With its small footprint, the BCM6020 is ideal for use in NIC,
PC card, and mini-PCI CPE modem designs. Robustness (to even
severe bursty ingress) is guaranteed through support of on-chip
and off-chip interleaving memory. This feature is useful for
industrial applications where such ingress can be a problem.
The BCM6020 also supports UTOPIA Level 1 and Level 2
interfaces and may easily be connected to industry-standard
ATM segmentation and reassembly engines. This facilitates the
delivery of multiple virtual circuits and traffic classes. Its flexible
frame structure enables transport of FEC encoded and uncoded
traffic, and an embedded operations channel protocol is
supported. Automatic rate-adaptive software is available for
support of symmetric and asymmetric links. The BCM6020
employs Tomlinson precoding and a programmable equalizer to
improve the immunity of the device to radio-frequency
interference that can occur in the case where unshielded wiring
is used in the distribution plant. The equalizer tap length is
programmable, thereby effectively combating intersymbol
interference over a wide range of symbol rates.
The BCM6020 is also ideal for WAN connections to SOHO
routers and integrated access devices. Supporting multimegabit
symmetric data rates in excess of HDSL, SDSL and G.Lite, it
represents the next step in broadband WAN access to small
businesses.
TRANSMITTER
RECEIVER
x
sin x
D/A
A/D
Packet
Format
Logic
Packet
Format
Logic
Nyquist
Filter
Nyquist
Filter
Acquisition/Tracking
Loops
PLL / Clock
Generation
JTAG
M-Bus / SPI
Interface
Nyquist
Filter
Interpolation
Filter
Interpolation
Filter
Programmable
Rate
I/Q
Mod
Programmable
Rate
I/Q
Mod
Nyquist
Filter
Reed-
Solomon
FEC
Encoder/
Interleaver
Reed-
Solomon
FEC
Decoder/
De-Interleaver
Adaptive
Decision-
Feedback
Equalizer
Interleave
RAM
Interleave
RAM
Phone: 949-450-8700
FAX: 949-450-8710
Email: info@broadcom.com
Web: www.broadcom.com
Broadcom
, the pulse logo
and Connecting Everything
TM
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.
6020-PB07-R-5.22.02
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