bcm3137 Broadcom Corp., bcm3137 Datasheet - Page 2

• Manufacturer Part Number: bcm3137
• Description: Bcm3137 Universal Burst Receiver
• Manufacturer: Broadcom Corp.

The
QPSK/16 QAM Burst Receiver is a complete single-chip cable
network receiver, that accepts QPSK and 16 QAM upstream
burst data in a frequency-agile, time-division multiple access
(TDMA) scheme.
demodulator and an FEC decoder are integrated on this single
chip.
conversion on either an IF input or baseband I/Q inputs. A digital
down-mixer translates the input spectral center to true DC.
The I and Q samples pass through dual decimators and square-
root raised cosine filters with an excess bandwidth
Fast burst detection and acquisition are performed on the
preamble with programmable length and pattern. The chip
incorporates unique word (UW) detection in the preamble
process to delineate the packet and resolve phase ambiguity.
Carrier phase offset is removed by a derotator. An adaptive
equalizer characterizes the RF channel response and removes
inter-symbol interference (ISI) caused by micro-reflections.
The FEC decoder consists of a programmable derandomizer and
a programmable RS decoder. FIFO buffers provide input/output
data rate de-coupling for the FEC decoder.
Broadcom
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.
3137-PB05-R-11.22.02
SMPLCK
®
A_QP/N
A_SP/N
The AFE performs coarse gain setting and A-to-D
Broadcom
A_IP/N
, the pulse logo, QAMLink
2
2
2
(PGA's,
TCK
ADC's)
AFE
An analog front-end (AFE), a QAM
TMS
BCM3137
JTAG
10
10
TDI
®
Complex
and Connecting everything
DDFS
Digital
Mixer
®
TDO
Decimator
Decimator
QAMLink
B C M 3 1 3 7
Variable
Variable
PLLBYP
PLL & Clock Generation
XTALI
®
®
Matched
Matched
are trademarks of
Filter
Filter
XTALO
Ranging
Block
Universal
= 0.25.
RESET
Derotator
Phase
Preamble
Process
O V E R V I E W
12C
SPI
The BCM3137 delivers the recovered data stream and accepts
receiver control inputs through a receive interface linked to an
MCNS MAC chip. The BCM3137 prepends ranging and data
information to each received code word and packet for
processing by the BCM3210B. An ATM UTOPIA-like receive
interface is also supported in a bit-serial style. The BCM3137
can be configured through either an SPI or I 2 C-compatible
serial interface.
The BCM3137 represents a highly-integrated, mixed-signal
solution that significantly increases the channel density per line
card for CMTS implementations. When combined with the
BCM3033 QAMLink Universal Modulator and the BCM3210B
QAMLink CMTS Media Access Controller, these chips are an
ideal solution for cable headends. A complete CMTS reference
design (BCM93210B), which integrates these three chips, is
available from Broadcom, providing a complete development
platform for a multi-channel, DOCSIS/EuroDOCSIS-compliant
Cable Modem Termination System.
SCK
Equalizer
SCL
Adaptive
Tracking
Loops
MOSI
SDA
Micro Interface
ADDR0
SS
ADDR1
FEC Interface
Decoder
Multi-Type Burst
MISO
and FIFO's
randomizer
Configuration
RS
De-
Banks
ADDR2 ADDR3
Channel
Charact.
Storage
External
Bypass/
Control
Probe/
TM[2:0]
Interface
Receive
3
Email: [e-mail]
Web: www.broadcom.com
10
10
8
8
Phone: [phone]
FAX: [phone]
RXDATA
BITCK_RSOB
BLKDV_REMP
MSCLK_RXNW
MAPDV_RXEN
MPCLK_RCLK
MAPDATA
PIOA[9:0]
PIOB[9:0]
TPA[7:0]
TPB[7:0]