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Conexant Systems
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CX24951 Datasheet Preview

CX24951 Datasheet

Single-Chip Cable Modem Solution

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CX24951 pdf
www.DBartaoSahdebeat4nUd.cMomodems
Cable Modems
Single-Chip Cable Modem Solution
DOCSIS2.0-Based
CX24951
Conexant’s next generation cable modem solution
offers a DOCSIS 2.0-based single-chip modem while
providing dual software programmable network
processing engines
Conexant’s broadband communications portfolio includes a comprehensive
suite of semiconductor solutions that enable the digital home and information
network. The InfoSurge™ 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 CX24951, Conexant’s DOCSIS 2.0-based single-chip cable modem
solution, provides backwards compatibility with the DOCSIS 1.1 and the
DOCSIS 1.0 standards. The world’s fastest, lowest power and smallest cable
modem solution, the CX24951, offers 500 MIPS of processing power while
consuming just 550mW in a 17mm x 17mm BGA package.
The CX24951 fully supports the new upstream physical-layer modulation
technologies A-TDMA (Advanced Time Division Multiple Access) and S-CDMA
(Synchronous Code Division Multiple Access) as specified in DOCSIS 2.0
standard. These new modulation techniques significantly increase upstream
cable bandwidth for data transmissions (up to 30Mbps) without requiring
any physical rebuilding of cable networks.
The CX24951’s 500 MIPS and software programmable dual processor architecture
with on-chip memory for cable MAC and application layer processing makes
it ideally suited for CableHome™ and PacketCable™ applications.
Dual Programmable Network Processors
The CX24951 utilizes the proven software programmable dual processor
architecture of its predecessor, the CX24943, and further boosts its
performance by increasing the instruction memory size to 128K bytes.
The CX24951 is pin compatible with the CX24943.
The dual network processing engine architecture offers real-time-critical
packet management processing and superior performance. The software
programmability of this architecture accommodates application specific
requirements, worldwide standards, and manufacturers’ unique value
added features for maximum flexibility.
CX24951 Distinguishing Features
• A-TDMA and S-CDMA DOCSIS
2.0 upstream modulation
• High level of integration
(Single monolithic IC)
• Dual software programmable
network processing engines
• 500 MIPS of processing power
• Less than 550mW typical
power dissipation
• Embedded IEEE 802.3 MAC with MII
• 12Mb USB 1.1 communications
transceiver
• Support for DOCSIS/EuroDOCSIS 2.0/
1.1/1.0, DVB and proprietary standards
• CableHome and PacketCable
compliant
• High density, 17mm x 17mm
BGA package
Part Number CX24951
Description Single-Chip Cable Modem



Conexant Systems
Conexant Systems

CX24951 Datasheet Preview

CX24951 Datasheet

Single-Chip Cable Modem Solution

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CX24951 pdf
Broadband Modems
Cable Modems
The dual processor architecture of the CX24951 allows it to be
used in CableHome applications, without needing an additional
network processor for the firewall and routing features required
by the CableHome standard. The firewall and routing algorithms
required by CableHome take less than 10 percent of the 500 MIPS
processing power of the CX24951, leaving plenty of processing
power left for developing custom networking applications.
The integrated MII port and the PCMCIA functionality of the
integrated host port allow the CX24951 to provide a seamless
interface to an array of networking peripherals such as wireless
LANs (802.11a/b), HomePlug transceivers, HPNA solutions, and
multi-port Ethernet Switches.
The CX24951 also supports PacketCable applications by
interfacing to Conexant’s voice DSP products to execute voice
processing algorithms.
Highly Integrated
The CX24951 supports a number of interfaces including a USB 1.1
communications transceiver, an IEEE 802.3 10/100 Ethernet Media
Access Controller (MAC) with a Media Independent Interface (MII)
for access to home networking standards. Examples are HPNA
2.0, HomePlug 1.0 and a host interface which supports seamless
connectivity to any PCMCIA compliance device such as IEEE
802.11a and IEEE 802.11b wireless transceivers. The CX24951
supports integrated and stand alone cable modems, home
networking gateway products, IP (Internet Protocol) telephony
products, and digital set-top boxes.
The CX24951 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. The CX24951 dissipates less than 550mW of power
setting a new standard for the industry.
The CX24951, through its high level of integration, enables
manufacturers to develop a complete cable modem with a
minimal number of additional components as shown in the
CX24951-based cable modem block diagram.
Cable
Tuner
4 MB
SDRAM
Power
Supply
LED Indicators
ADC
DAC
GPIO
MII
Control
CX24951
SDRAM
Interface
Host
Interface
USB
1.3v
3.3v
5.0v
2 MB
Flash
10/100
Ethernet
PHY
Conexant
HPNA 2.0
PHY
Conexant
HomePlug
PHY
Conexant
Voice DSP
802.11a/b
MAC/PHY
CX24951-based Cable Modem Block Diagram
RJ-45
RJ-11
Powerline
Type B
Socket
RJ-11
RJ-11
Antenna


Part Number CX24951
Description Single-Chip Cable Modem Solution
Maker Conexant Systems
Total Page 4 Pages
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