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Электронный компонент: CX24943

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Broadband Modems
Cable Modems
CX24943 Distinguishing Features
High level of integration
Dual software programmable
network processing engines
225 MHz system processor
Less than 500mW typical
power dissipation
Support for DOCSIS
TM
1.0/1.1,
EuroDOCSIS 1.0/1.1, DVB and
Proprietary Standards
Direct IF sampling at 44 and 36 MHz
Integrated A/Ds and D/As
Embedded IEEE 802.3 MAC with MII
12Mb USB 1.1 communications
transceiver
Support for home networking
standards and VoIP
Conexant's next generation cable modem solution
offers a higher level of integration, increased
performance, and lower power dissipation
Conexant's broadband communications portfolio includes a comprehensive
suite of semiconductor solutions that enable the digital home and information
network. The InfoSurge
TM
family of products, supporting broadband cable
modem applications, presents the industry with yet another example of
Conexant's ability to exceed the needs of a growing market segment. The
CX24943, Conexant's next generation single-chip cable modem IC, reduces
the cost of consumer premise equipment (CPE) by providing a highly
integrated, robust and flexible solution.
The CX24943 leads the industry in cost-effectiveness through its high
level of integration, advanced process technology, extremely small package
and low power consumption. It offers a dual software programmable
network processing engine architecture, allowing for real-time-critical
packet management processing for superior performance. The software
programmability of this architecture accommodates application specific
requirements, worldwide standards, and manufacturers' unique value added
features, for maximum flexibility. The CX24943 is software compatible with
its predecessor, the CN9414.
A multitude of interfaces are integrated into the chip, including an
embedded IEEE 802.3 Media Access Controller (MAC) with a Media
Independent Interface (MII), a USB 1.1 communications transceiver, and
a host interface. The CX24943 supports internal and external PC cable
modems, home networking gateway products, IP (Internet Protocol)
telephony products, and digital set-top boxes.
Part Number CX24943
Description Single-Chip Cable Modem IC
Single-Chip Cable Modem IC
With Dual Software Programmable
Network Processing Engines
CX24943
Broadband Modems
Cable Modems
Highly Integrated
The CX24943 single-chip cable modem IC integrates both
downstream and upstream physical layer (PHY) technologies
as well as dual software programmable network processing
engines with on-chip memory for cable MAC and application layer
processing. The CX24943 provides a cost-effective, single-chip,
digital cable communications solution. The IC supports a number
of interfaces including: an IEEE 802.3 10/100 Ethernet MAC with
MII for access to home networking standards such as HPNA 2.0
and HomePlug; a USB 1.1 transceiver; and a host interface to
accommodate IP telephony (VoIP), IEEE 802.11a and IEEE 802.11b
wireless networking standards.
The CX24943 was developed using leading-edge process and
packaging technologies. This helps drive down the size of the
monolithic IC, package and power, while allowing clock rates to
increase more than 40% from the previous generation of this
product. The CX24943 dissipates less than 500mW of power,
setting a new standard for the industry.
The CX24943, through its high level of integration, enables
manufacturers to achieve cost targets unparalleled in the industry.
The additional components required to develop a complete cable
modem are minimal as shown in the CX24943-based Cable
Modem block diagram.
Increased Performance
The CX24943 utilizes the proven architecture of its predecessor,
the CN9414, and boosts performance by increasing the system
processor speed to 225 MHz. The CX24943 single-chip cable
modem IC block diagram shows the major functional blocks of
the monolithic IC.
Conexant's sixth-generation physical-layer downstream receiver
includes a 10-bit A/D that accepts a direct IF signal (at 44 or
36 MHz) and a 16/256 QAM demodulator with Annex A and B
forward error correction. The CX24943 also contains an 11-bit
D/A converter, which can accommodate 65 MHz of upstream
bandwidth for EuroDOCSIS and DVB applications, and a
QPSK/16 QAM burst upstream modulator. Conexant's proven
PHY technology exceeds all DOCSIS
TM
/EuroDOCSIS 1.0/1.1
requirements for low BERs in noise-filled environments.
The CX24943 is the fastest solution in the industry with
integrated dual software programmable network processing
engines on board. Its unique packet management, unified
memory architecture, and advanced system buses, maximize
performance by allowing segmentation of real-time-critical
DOCSIS/EuroDOCSIS 1.0/1.1 functions from non real-time-critical
application processes. The CX24943's processor performance
and unique architecture enables DOCSIS/EuroDOCSIS 1.0/1.1 and
other software applications, including: firewall for added security;
routing for home networking; or VoIP for low-cost IP telephony.
CX24943-Based Cable Modem Block Diagram
10/100
Ethernet
PHY
SDRAM
Interface
CX24943
Host
Interface
GPIO
MII
USB
Conexant
HPNA 2.0
PHY
Conexant
HomePlug
PHY
Conexant
Voice DSP
RJ-45
RJ-11
RJ-11
RJ-11
Antenna
Powerline
Type B
Socket
2 MB
Flash
8 MB
SDRAM
LED Indicators
Power
Supply
1.3v
3.3v
5.0v
802.11a/b
MAC/PHY
ADC
DAC
Control
Tuner
Cable
High Flexibility
Cable modem manufacturers have to devote a significant
amount of resources to bring new certifiable solutions to market.
The unique architecture of the CX24943 provides a number of
advantages for cable modem manufacturers and cable operators
alike. The software programmability of the dual network processing
engine allows manufacturers to customize the CX24943 for
application specific requirements, both at the cable MAC and
software applications layer. This feature allows one base platform
to support numerous products, including IP telephony, home
networking and set-top boxes as shown in the CX24943-based
Cable Modem block diagram. In addition, the architectural similarities
between the CX24943 and its predecessor, the CN9414, allows
for maximum reuse of certified code.
The CX24943 provides the ability to adapt to a multitude of standards
by downloading different software into the embedded dual network
processing engine, including DOCSIS/EuroDOCSIS 1.0/1.1, DVB
and proprietary standards. Finally, cable operators can download
complex feature enhancements above and beyond simple code
upgrades to field-deployed solutions, minimizing
truck rolls and equipment obsolescence.
Complete Solution
To reduce the resources and development time required to bring
CX24943-based cable modem solutions to market, Conexant
provides complete certifiable DOCSlS/EuroDOCSIS 1.0/1.1 cable
modem reference designs which incorporate all of the hardware
and software needed for DOCSIS certification.
The cable modem reference designs include Conexant software
that is compliant to DOCSIS/EuroDOCSIS 1.0/1.1 and include the
USB drivers that meet Microsoft's Windows Hardware Quality Lab
(WHQL) requirements. Additional software enhancements that are
above and beyond standards-based requirements are also included
in this complete software offering.
CX24943 Single-Chip
Cable Modem IC Block Diagram
Peripheral
I/O
Memory
DMA
Interrupt
Controllers
Applications
Network
Processor
USB
Host
Interface
Cable PHY
Downstream
Cable PHY
Upstream
S-CDMA
A-TDMA
A
D
C
D
A
C
Cable MAC
Network
Processor
MII
2002, Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant
logo are registered trademarks of Conexant Systems, Inc. All other trademarks
are owned by their respective owners. Although Conexant strives for accuracy
in all its publications, this material may contain errors or omissions and is
subject to change without notice.
THIS MATERIAL IS PROVIDED AS IS AND WITHOUT
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NON-INFRINGEMENT.
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
Broadband Modems
Cable Modems
02-0703
CX24943 Features
Cable PHY Downstream
10-bit A/D
Direct IF sampling at 44 and 36 MHz
16/256 QAM Demodulator
Programmable equalization
Annex A and B FEC
Cable PHY Upstream
11-bit D/A
QPSK/16 QAM burst modulator
Programmable pre-equalization
DMA Interrupt Controller
16 asynchronous channels
Memory to memory moves: aligned/unaligned
Source/destination mode for simple data transfer
Circular/linked buffer support for inbound/outbound data
Peripheral I/O
32 GPIO
JTAG boundary scan
UART
Cable MAC Network Processor
Software Programmable
- DOCSIS 1.0/1.1 compliant
- EuroDOCSIS 1.0/1.1 compliant
- DVB compliant
- Fixed wireless compliant
- Proprietary standards
Application Network Processor
ARM940T microcontroller
Up to 225 MHz operation
4KB instruction and 4KB data cache
Embedded ICE and debug extensions
PID, SID, DA/SA, MAC, IP and LLC filtering
Four 56-bit DES/CRC engines
HCS 16- and 32-bit CRC single-cycle engines
MII
IEEE 802.3 MAC layer
Networking technologies
- 10/100 Ethernet
- Conexant HPNA 2.0
- Conexant HomePlug 1.0
Host Interface
Master mode
- 16-bit data
- 8-chip selects
Supports Flash, IP telephony, IEEE 802.11a or IEEE 802.11b
16/32-bit Slave mode (external host and test)
USB 1.1
Integrated 12 Mb transceiver
Communications peripheral device
Memory
Internal 8K x 32 SRAM
External SDRAM Interface
- 16-bit interface
- Supports both 4MB and 8MB technologies
Phase-Locked Loops (4)
TDM clock and frame sync generator
Transmit clock generator
Supplied 25MHz Ethernet reference clock
Internal USB clock
Miscellaneous Functions
Watchdog timer
Four additional timers
Interrupt controller
Package and Power
228 PBGA
All I/O at 3.3V
Power supply: 3.3V and 1.2V
<500 mW (typical)
Reference Designs
DOCSIS 1.0/1.01
EuroDOCSIS 1.0/1.1
PCI
Product Applications
(DOCSIS/EuroDOCSIS /1.0/1.1, DVB, Proprietary)
Cable Modems with Ethernet
Cable Modems with USB
Cable Modems with IP Telephony
PCI Cable Modem Card Internal (CMCI)
Cable Modem with Home Networking
PCMCIA Cable Modem
Digital Set-Top Box with Cable Modem
www.conexant.com
General Information:
U.S. and Canada: (800) 854-8099
International: (949) 483-6996
Headquarters Newport Beach
4311 Jamboree Rd, P.O. Box C
Newport Beach, CA 92660-3095
Order# 101645B