BCM6020
®
BCM6020 SCALABLE DSL TRANSCEIVER
•The Broadcom BCM6020 is a single-chip QAM, twisted-pair,
scalable, digital subscriber line (DSL) transceiver that is
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 to13 Mbaud
•Less than 1W power consumption
•Integrated carrier and clock recovery loops for ease of use
•Programmable 4–256 QAM constellations
•Single 3.3V 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
•x/sin x transmit pre-emphasis
•Enhanced adaptive decision feedback equalizer
FEATURES SUMMARY OF BENEFITS
Central Office Linecard Block Diagram
•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 through register programming.
•Supports frame-based and cell-based transport streams.
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
OVERVIEW
®
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2004 by BROADCOM CORPORATION. All rights reserved.
6020-PB09-R 08/27/04
Broadcom®, the pulse logo, and Connecting everything® are trademarks of Broadcom Corporation and/
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
The BCM6020 is the first single-chip VDSLsolution to offer support for
unshielded telephone distribution cable through the use of on-chip
advanced digital filtering, precoding, and equalization techniques. The
BCM6020 offers DSLsystem 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 BCM6020has been designed for any DSL 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 can 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 an enhanced adaptive
decision feedback equalizer. Because the equalizer tap length is
programmable, it effectively combats 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
multi-megabitsymmetric 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
MBus/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
