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BCM3140
PRODUCT
(R)
Brief
OF BENEFITS
DUAL UNIVERSAL ADVANCED TDMA/SCDMA PHY-LAYER BURST RECEIVER
BCM3140 FEATURES SUMMARY BCM3140 is a universal headend advanced TDMA * The SCDMA physical layer QPSK/QAM burst receiver and DOCSIS * compliant 2.0 based, IEEE 802.14, DAVIC and DVB Programmable demodulation including * 8, 16, 32, 64, 128 and 256 QAM formats BPSK, QPSK, from 160 Kilobaud to 5.12 * Variable symbol rates320 Kbps to 40 Mbps operation Megabaud providing Powerful Reed-Solomon FEC decoder with * deinterleave options for impulse/burst noisebyte mitigation * Burst acquisition as fast as 16 preamble symbols On-board * channel 12-bit analog-to-digital converters for each Direct sampling option for DOCSIS via * input operating at 160 MHz with LVDS 12-bit digital or TTL level
TM
Presents high-performance, integrated solution * upstreamademodulation in cable over data, video,for and
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* * * * * *
interface options Powerful on-board equalizer provides ingress and adjacent channel overlap protection Integrated fast Fourier transform (FFT) processor with variable FFT sizes and programmable window options I2C or SPI-compatible microcontroller interface JTAG test interface 208-pin PQFP package Operates over industrial temperature range (-40 to +85 C)
telephony applications. Two independent burst receivers per package enable high-density equipment designs, reducing equipment board space requirements. Based on DOCSIS 2.0 standards for use in cable modem termination systems (CMTS). Seamless integration with BCM3214 advanced CMTS DOCSIS 2.0 media access controller (MAC). Applies to digital CATV reverse-channel receiver. High bps/Hz modulation enables advanced digital services over narrow RF channels. Includes flexible analog front end options. Use of on-board ADCs minimizes external components. Direct sampling option via external 12-bit ADC minimizes RF components. On-board equalizer enables operation of digital services under challenging plant conditions. On-chip FFT enables spectrum analysis and management of the entire upstream channel. Small footprint enables high-density equipment. Deploys advanced functions in harsh environments. Distributed CMTS in hybrid fiber coaxial fiber node.
Cable Modem Termination System (CMTS) Block Diagram
5-65 MHz Upstream
BCM3140
Dual Adv. TDMA/ SCDMA Receiver
BCM3140 BCM3140
Ethernet
BCM3214
DOCSIS 2.0 CMTS MAC
PCI Bus
Routing/ Classification Engine
WAN
System CPU
44 MHz IF BCM3040 Advanced QAM Modulator
PA
LPF
Downstream SDRAM (PHS, output queues)
Memory
BCM3140
OVERVIEW
BCM3140 Block Diagram
24 DAP/N AFE (ADC AND MUX) Direct Digital FS
Variable Decimator
Matched Filter SCMA DeSpeader QAM Burst DeSpeader Adaptive Equalization and Ingress Cancellation TCM Demap and SCDMA Deframer FEC
2 A_IP/N
Variable Decimator
Matched Filter
MAC/PHY Interface Ch-A
(To/From MAC)
FFTSTRT FFTCLK FFTDATA FFTDV 24 DBP/N Receive Channel B B_IP/N 2 CKIP/N 2 JTAG PLL and Clock Generation Micro Interface Bypass/Probe/ External Control EXCTLA MAC/PHY Interface Ch-B (To/From MAC) FFT Processor DSP Core Ranging Block Preamble Process Tracking Loops
EXCTLB
5
4
24
TCK TMS TDI
TDO
PLLBYP
XTALI XTALO
RESET
I2C SPI
SCL SDA ADDR0 ADDR1 ADDR SCK MOSI SS MSO [6:2]
TM [3:0]
TPA/B [11:0]
The BCM3140 QAMLink(R) Universal QPSK/QAM burst receiver is a highly integrated solution that significantly decreases the board space and cost of demodulators in digital cable modem headend applications. The BCM3140 provides two independent cable network receivers that accept QPSK and mQAM burst data in TDMA or SCDMA schemes. Advanced features in the BCM3140 include an analog front end (AFE), a QAM demodulator, a generalized equalizer and an enhanced Reed Solomon (RS) FEC decoder with dynamic deinterleaving. The AFE provides coarse gain setting and A-to-D conversion (ADC) on either an IF input or baseband I/Q inputs. When the internal ADC is bypassed, the on-chip digital mixer translates the desired signal at RF to true DC where the I and Q samples pass through variable decimators and matched raised-cosine filters. The BCM3140 incorporates unique word detections of programmable length and pattern in the burst preamble for signal acquisition as fast as 16 symbols. An adaptive equalizer and ingress canceller characterizes the RF channel response, cancels ingress noise and removes intersymbol interference (ISI) caused by microreflections in the channel. The FEC decoder consists of
Broadcom(R), the pulse logo, QAMLink(R) and Connecting everything(R) are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. DOCSISTM is a trademark of Cable Television Laboratories, Inc. All other trademarks are the property of their respective owners.
a programmable derandomizer, a programmable RS decoder with T values programmable up to 16 and a byte deinterleaver with burst-by-burst reconfiguration capability. The BCM3140 delivers the recovered data stream and accepts receiver control inputs through a receive interface linked to a DOCSIS MAC chip such as the BCM3214. The BCM3140 prepends ranging and data information to each received code word and packet for processing by the BCM3214. The BCM3140 can be configured through either an SPI or I2Ccompatible serial interface. The BCM3140 is a highly integrated, mixed-signal and costeffective device providing a worldwide solution for burst receiver applications. The dual receiver design of the BCM3140 is packaged in a 208-pin PQFP, enabling a significant increase upstream channel density for headend based CMTS equipment. The BCM3140, combined with the BCM3040 QAMLink(R) Universal Modulator and the BCM3214 Advanced QAMLink(R) CMTS MAC, provides a complete solution for advanced cable headend equipment.
(R)
BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013
(c) 2002 by BROADCOM CORPORATION. All rights reserved. 3140-PB01-R-11.22.02
Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com

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