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Conexant Systems

CX24430 Datasheet Preview

CX24430 Datasheet

Interactive Cable TV Decoder IC

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Set-Top Box Solutions
Cable
www.DataSheet4U.com
Interactive Cable TV Decoder IC
CX24430/1/2/3
Conexant‘s highly integrated, single IC,
MPEG-2/DVB-compliant, decoder/transceiver
solution for digital cable television receivers
Conexant’s broadband communications portfolio includes a
comprehensive suite of semiconductor solutions that enable the
digital home and information network. Adding to this impressive line
up are the CX24430/1 and CX24432/3 Interactive Cable TV Decoder
ICs. These highly-integrated products combine a high-speed broadband
cable modem and an interactive TV broadcast service decoder onto a
single chip. It is a breakthrough in IC integration that will allow set-top
box manufacturers to offer advanced, fully-interactive broadband home
gateways or other set-top appliances for the price of an entry-level
product that only receives TV broadcasts. The CX24431/3 versions
support NDS Videoguard® conditional access technology.
The CX24430/2 ICs combine the industry’s highest performance
DOCSIS® cable modem with the company’s third generation interactive
TV decoder technology. This new platform optimizes performance by
partitioning cable modem tasks between a dedicated 32-bit ARM940T
processor and programmable software MAC. At the same time, digital
TV broadcast service decoding and set-top box interactive applications
are hosted by a second, dedicated high performance 275MIPS main
system processor. The cable modem section of the device also allows
for narrowband interactivity based on DAVIC 1.2 and 1.5 as well as the
DVS 178 and DVS 167 specifications.
CX24430/1/2/3 Distinguishing Features
• Cable modem compliant with
DOCSIS®/ EuroDOCSIS™1.0/1.1,
DVS 178, DVS 167 and DVB
• MPEG-2 Digital TV broadcast
decoder system
• Worldwide NTSC/PAL/SECAM
TV encoder
• Dual CPU architecture delivering
500+ aggregate MIPS
• Dual tuner PVR support
• High-performance, IP packet bridging
to Ethernet, USB and internal CPU
• Advanced 2D graphics rendering
• OpenCable™ compliant
• QPSK out-of-band receiver
and a QPSK/16-QAM upstream
burst modulator
Part Number CX24430/1/2/3
Description Interactive Cable TV Decoder IC




Conexant Systems

CX24430 Datasheet Preview

CX24430 Datasheet

Interactive Cable TV Decoder IC

No Preview Available !

Set-Top Box Solutions
Cable
www.DataSheet4U.com
The CX24430/1 and CX24432/3 cable modem sub-systems include
a complete upstream/downstream physical layer, and an Ethernet
MAC in addition to the cable modem MAC and host processor.
The set-top box decoder functionality includes an MPEG-2 video
decoder, digital audio decoder, three multi-standard transport
streamdemultiplexers, an advanced 2D graphics processor,
TV encoder, multi-plane compositing engine, a 256 QAM
demodulator/FEC block and a high performance 32-bit ARM920
RISC processor with integrated peripheral I/O ports. This makes
for an architecture that delivers a rich, high quality navigation/
user interface for advanced electronic program guides and other
interactive TV applications.
The dual CPU system architecture provides 500+ aggregate MIPS
for hosting the operating system, interactive middleware, DOCSIS
stack and interactive TV applications, while delivering industry-
leading cable modem packet performance. The CX24430/1 and
CX24432/3 ICs fully support Data Over Cable Service Interface
Specification (DOCSIS®) and EuroDOCSISversion 1.1 standards.
The CX24430 and CX24431 set-top box sub-systems also enable
advanced Personal Video Recorder (PVR) functionality. Users are able
to record two different programs simultaneously with DES copy
protection while playing back a third. The CX24430 and CX24431
incorporate a built-in high-speed hard disk drive controller interface
for fast data transfers in PVR applications like pause, instant replay,
fast forward and rewind.
Analog video support is provided by four high quality CVBS/
S-video/RGB output signals for all worldwide NTSC/PAL/SECAM
broadcast standards. The IC also provides an input port for
digitized analog signals based on the CCIR 656 format to support
analog TV display and compositing with program guide graphics.
The CX24430/1 and CX24432/3 ICs integrate dual, high
performance SDRAM memory controllers. A 32-bit 143MHz
memory controller supports all of the set-top box back-end
requirements in a unified memory architecture. This back-end
SDRAM memory system is used to support the requirements
of the main system CPU, MPEG-2 Audio Video (A/V) decoder,
transport demultiplexer, graphics, frame buffer and the still plane
picture buffers. A second, dedicated 16-bit 143MHz SDRAM
controller services the needs of the cable modem system, including
the code store for the RTOS executing on the cable modem
CPU as well as packet buffers for bridging to Ethernet and USB.
SDRAM
PHY FLASH
SDRAM
ARM920T
Cable
Modem
Host CPU
DOCSIS
DBV
DAVIC
MAC
16-bit
MC
SDR
USB
Host
and
Device
10/100
Ethernet
MAC
PCI/
ISA
Bus
ATA
66
GXA
2D
Accel-
erator
32-bit
MC
SDR
MPEG
MP@ML
Video
Decoder
MPEG/
Dolby
Audio
Decoder
DES/CRC
QPSK/
16 QAM
Burst
Mod
DAC
QAM
Demod
FEC
ADC
QPSK
Demod
FEC
ADC
Triple Demux
TS I/O Switch
16-256 QAM
Demod
Annex A, B, C
FEC
ADC
ARM920T
250MHz
Main
System
CPU
GPIO/I2C/
Serial/IR
Smart
Cards
Display
Compositing
• MPEG Scale
• Still Plane
Scale
• Video/OSD
Blend
• Flicker Filter
TV Encoder
OOB
Tx
IB
Tuner
OOB
Tuner
OOB
Rx
Baseband
TS I/O
IB
Tuner
QAM
Demod
CX24430/1 IC Block Diagram
NTSC
Decoder


Part Number CX24430
Description Interactive Cable TV Decoder IC
Maker Conexant Systems
Total Page 4 Pages
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