d i g i t a l i n f o t a i n m e n t p r o d u c t s
CN9414
S i n g l e - C h i p C a b l e M o d e m
Direct IF sampling at 44 and 36 MHz
Integrated A/Ds and D/As
FEC A, B and support; 34 and 204 (internal)
Programmable MAC (DOCSIS or DVB)
Embedded ARM
TM
9 HOST uP
Integrated 10/100 Ethernet MAC w/MII
12 MB USB peripheral transceiver
Low-cost support for 16/64M SDRAMs
D i s t i n g u i s h i n g F e a t u r e s
Conexant Offers a Worldclass Broadband
Access Platform with Low-Cost,
High-Performance, and Flexibility
The InfoSurge
TM
family of products supporting broadband cable
applications presents the industry with yet another example of
Conexant's ability to meet the growing needs of an emerging market
segment. The CN9414, Conexant's single-chip cable modem within
the InfoSurge family of products, offers a unique solution supporting
worldwide cable modem deployment with a multitude of peripheral
connections including Ethernet and USB. The CN9414 supports
internal and external PC cable modem applications, as well as digital
set-top boxes, home networking, and IP telephony products. This
unique IC excels in three very important categories when choosing
a solution for broadband access applications: cost, performance,
and flexibility through field programmability.
Cost
Through unsurpassed levels of integration, a unique architecture,
and leading-edge manufacturing techniques, Conexant has
accomplished a level of cost reduction second to none. The single-
chip cable modem IC includes a 10-bit A/D, a 10-bit D/A, 64/256
QAM Demodulation with Annex A and B Forward Error Correction,
QPSK/16 QAM Burst Transmitter, a Programmable MAC, an
embedded ARM
TM
microprocessor, a 10/100 Ethernet MAC, a USB
Transceiver, and SRAM. In addition, it offers peripheral interfaces
to accommodate IP telephony, home networking, and video
products. The intelligence built into this IC results in a cable
modem Bill of Materials (BOM) unmatched in the industry.
d i g i t a l i n f o t a i n m e n t p r o d u c t s
CN9414
S i n g l e - C h i p C a b l e M o d e m
Performance
Each piece of the CN9414 architecture offers its
own unique contribution to the overall performance
of the CN9414. The cumulative effect of each of these
pieces is unsurpassed performance at the system
level, resulting in a broadband access device the
consumer enjoys using. The front end of the IC
contains a fifth-generation physical layer receiver that
accepts a direct IF signal (at 44 or 36 MHz) leading
to a significant BOM reduction over the competition.
It also contains 10-bit D/A converter operating well
above 150 MHz with >8 significant bits, resulting
in a back channel that can accommodate 65 MHz of
upstream bandwidth for European applications. The
programmable MAC is built into an embedded RISC
CPU that not only has enough horsepower to do the
cable MAC functionality, but offers enough performance
to accommodate emerging applications like DOCSIS
1.1 and DVB. The CN9414's unique packet management,
unified memory architecture, and advanced system
buses enable a high-speed Internet access device.
CN9414 system diagram
Flexibility through Field Programmability
The flexibility of the CN9414 product offers four main advantages
to the OEM manufacturer. First, the platform provides the option
to adapt to a multitude of standards by downloading different
software onto the embedded RISC engine. These standards
include DOCSIS, EuroDOCSIS, or DVB (ECCA). Second, the
flexibility enables OEMs to be poised for emerging applications
like IP telephony and home networking. Third, the platform contains
RISC engines with excess MIPS, offering OEMs the flexibility to add
their own IP for unique differentiation via software. Finally, the
CN9414 significantly reduces hardware development time by having
software upgrade capabilities.
What is a Cable Modem?
A cable modem is a device that allows high-speed data
access -- from a PC to the Internet -- via a cable TV
(CATV) network. It is a modem in the true sense of the
word -- it modulates and demodulates signals -- and
it delivers Internet data to the desktop at blazing
speeds. It simply uses the increased bandwidth of the
TV cable instead of an ordinary phone line.
Cable modems can be part modem, part tuner, part
encryption/decryption device, part bridge, part router,
part NIC card, part SNMP agent, and part Ethernet hub.
They typically have two connections: one to the cable
wall outlet and the other to a computer.
Online access via cable modems allows PC users to
download information from online services up to
1,000 times faster than today's fastest telephone
modems. Here's a quick comparison between a cable
modem and a typical traditional modem. Cable
modem speeds range from 500 Kbps (500,000 bits per
second) to 10 Mbps (10 million bits per second).
A traditional V.90 56K modem tops out at only 56,000
bits per second. That's a difference of 444,000 bits per
second. Hardware companies are presently developing
30 Mbps cable modems (30,000,000 bits per second)
-- which are thousands of times faster than ordinary
telephone modems.
Conexant is working on what's next in cable modem
technologies -- so home or office PC users will be
able to download more information from the Internet
in less time.
CN9414 block diagram
f e a t u r e s a n d s p e c i f i c a t i o n s
Product Features
External Communication Blocks
Cable PHY Downstream
Direct IF sampling at 44 and 36 MHz
64/256 QAM
FEC A and B and Interleaving depths
(34 and 204)
10-bit A/D
Cable PHY Upstream
QPSK/16 QAM burst modulator
Programmable equalization
D/As for RF/IF AGC control
10-bit D/A
Programmable Master or Slave Host Interface
Master mode: (IP telephony, telco return,
PCI video solutions)
16-bit data
8-chip selects
16/32-bit slave mode: external host and test
Write and read strobes or data strobe
and R/W
Data transfer handshaking and
interrupt support
External interface to Flash
External SDRAM Interface
SDRAM technology (120 MHz)
Depths from 2 MB to 8 MB
Support for both 16 Mb and 64 Mb technology
Ethernet MAC
MAC sublayer of IEEE 802.3
10/100 Mbps full duplex
Half-duplex and loopback operation
Media Independent Interface (MII)
Optional 7 wire serial interface 10 M operation
USB
On-chip full-speed transceiver
Device interface to host controller/hub
UART
Asynchronous RxD/TxD serial port:
8-bits data, 1 stop bit, no parity
Peripheral I/O
32 GPIO
JTAG boundary scan
Crystal Oscillator
Low-jitter oscillator
Phase-Locked Loops (3)
Transmit clock generator
ARM reference clock generator
ASB clock generator
Package and Power
264 BGA
All I/O at 3.3V
Power supply: 3.3V and 2.5V
Internal Block Features
Embedded ARM Processor
ARM940T microcontroller
5-stage instruction pipeline
Harvard load/store architecture -- separate
instruction and data buses
Debug extensions and embedded ICE
Memory Blocks
Internal 8 K x 32 SRAM
16-bit interface to external SDRAM:
2 to 8 MB
DMA Controller
13 asynchronous channels
Memory to memory moves:
aligned/unaligned
Source/destination mode for
simple data transfer
Circular/linked buffer support for
inbound/outbound data
Internal Bus Architecture
100 MHz 32-bit Advanced System Bus (ASB)
50 MHz 64-bit Advanced Peripheral Bus (APB)
Bridge: ASB master/slave, APB master
Cable MAC (Programmable)
DOCSIS 1.0 Compliant
DOCSIS 1.1 Compliant
DVB for Europe
Filters; PID, DA/SA, SID, Multicast, IP
56-bit DES engines (3)
HCS 16- and 32-bit CRC single-cycle engines
Miscellaneous Functions
32-bit system timer, 4 16-bit timers
IRQ#/FIQ# interrupt controller
Product Applications
(DOCSIS, Euro-DOCSIS, DVB)
Cable Modems w/Ethernet
Cable Modems w/USB
PCI Cable Modem Card Internal (CMCI)
Cable Modem w/HPNA
Digital Set-Top Box w/Cable Modem
SOHO Cable Modem Products
Cable IP Telephony Products
Conexant and the Conexant symbol are trademarks of Conexant Systems, Inc.
Further Information
literature@conexant.com
1-800-854-8099 (North America)
33-14-906-3980 (International)
Order # 100377A
99-1538
Digital Infotainment
Printed in USA
World Headquarters
Conexant Systems, Inc.
4311 Jamboree Road
P. O. Box C
Newport Beach, CA
92658-8902
Phone: (949) 483-4600
Fax: (949) 483-6375
U.S. Florida/South America
Phone: (727) 799-8406
Fax: (727) 799-8306
U.S. Los Angeles
Phone: (805) 376-0559
Fax: (805) 376-8180
U.S. Mid-Atlantic
Phone: (215) 244-6784
Fax: (215) 244-9292
U.S. North Central
Phone: (630) 773-3454
Fax: (630) 773-3907
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Fax: (978) 692-8185
U.S. Northwest/Pacific West
Phone: (408) 249-9696
Fax: (408) 249-7113
U.S. South Central
Phone: (972) 733-0723
Fax: (972) 407-0639
U.S. Southeast
Phone: (919) 858-9110
Fax: (919) 858-8669
U.S. Southwest
Phone: (949) 483-9119
Fax: (949) 483-9090
APAC Headquarters
Conexant Systems Singapore,
Pte. Ltd.
1 Kim Seng Promenade
Great World City
#09-01 East Tower
Singapore 237994
Phone: (65) 737 7355
Fax: (65) 737 9077
Australia
Phone: (61 2) 9869 4088
Fax: (61 2) 9869 4077
China
Phone: (86 2) 6361 2515
Fax: (86 2) 6361 2516
Hong Kong
Phone: (852) 2827 0181
Fax: (852) 2827 6488
India
Phone: (91 11) 692 4780
Fax: (91 11) 692 4712
Korea
Phone: (82 2) 565 2880
Fax: (82 2) 565 1440
Europe Headquarters
Conexant Systems France
Les Taissounieres B1
1681 Route des Dolines
BP 283
06905 Sophia Antipolis Cedex
France
Phone: (33 4) 93 00 33 35
Fax: (33 4) 93 00 33 03
Europe Central
Phone: (49 89) 829 1320
Fax: (49 89) 834 2734
Europe Mediterranean
Phone: (39 02) 9317 9911
Fax: (39 02) 9317 9913
Europe North
Phone: (44 1344) 486 444
Fax: (44 1344) 486 555
Europe South
Phone: (33 1) 41 44 36 50
Fax: (33 1) 41 44 36 90
Middle East Headquarters
Conexant Systems
Commercial (Israel) Ltd.
P. O. Box 12660
Herzlia 46733, Israel
Phone: (972 9) 952 4064
Fax: (972 9) 951 3924
Japan Headquarters
Conexant Systems Japan Co., Ltd.
Shimomoto Building
1-46-3 Hatsudai,
Shibuya-ku,Tokyo
151-0061 Japan
Phone: (81 3) 5371-1567
Fax: (81 3) 5371-1501
Taiwan Headquarters
Conexant Systems,Taiwan Co., Ltd.
Room 2808
International Trade Building
333 Keelung Road, Section 1
Taipei 110,Taiwan, ROC
Phone: (886 2) 2720 0282
Fax: (886 2) 2757 6760
www.conexant.com
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