set-top box solutions cable 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 conexants highly integrated, single ic, mpeg-2/dvb-compliant, decoder/transceiver solution for digital cable television receivers conexants 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 industrys highest performance docsis ? cable modem with the companys 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 specifcations. part number CX24430/1/2/3 description interactive cable tv decoder ic interactive cable tv decoder ic CX24430/1/2/3
set-top box solutions cable 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 specifcation (docsis ? ) and eurodocsis ? version 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 unifed 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. CX24430/1 ic block diagram displa y compositing s cale still lane s cale i eo/sd blen lic k er ilter ncoer i/i 2 c/ s erial/i smar t cars 20 20 ain s ystem c 20 cale oem ost c dcsis db d ic c ieo decoer / doly io decoer 1 it c sd s sb ost an deice 1 0/1 00 ternet c x 2d ccel erator sd 32it c sd sd ci/ is bs s 1 2 demo nne b c c s i/ sitc sc decoer demo ib ner ib ner b ner b b basean s i/ dc s demo c dc riple dem ds/cc demo c dc s/ 1 br st o dc
fully integrated set-top box middleware and real time operating system (rtos) support includes hardware abstraction layer solutions for liberate, opentv, nucleus+, psos and vxworks. the CX24430/1 and cx24432/3 ic solutions are also complemented by conexants docsis communications protocol stack which is available for license by set-top box manufacturers. a complete set of low-level software drivers and the associated api are also available to support the opencable advanced host requirements, including the legacy oob mode (dvs 167 or dvs 178 signalling with a pod module) and the dsg mode (oob signaling through an embedded docsis cable modem). these drivers and api also support the oob signaling through an embedded davic cable modem. conexants system-level approach with the CX24430/1 reduces cost and time-to-market for oem set-top box vendors as well as allowing them an opportunity to offer their customers a complete interactive set-top box design for the same price as a broadcast service-only product. table 2. CX24430/1/2/3 part/dash number matrix n=functional/performance configuration; x=die revision 1x 2x 3x 4x 5x 6x 7x 8x 1x 2x 3x 4x 5x 6x 7x 8x nds icam macrovision 7x dolby digital 250mhz arm920 200mhz arm920 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? CX24430/2 -nx cx24431/3-nx part number ts demuxe s ultra dm a 66mhz controller ide hd d interface (atapi port) copy protection & des cipherin g dual tune r pvr support CX24430/1 3 yes ye s y es yes cx24432/3 2 n o n o n o n o table 1. CX24430/1 and cx24432/3 feature differences
? 2003, 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. set-top box solutions cable 03-0855 CX24430/1/2/3 features ? mpeg-2 mp@ml video decoder ? mpeg-1, mpeg-2 audio decoder ? dolby digital decoder ? 32-bit arm920t main system cpu ? tv encoder ? multi-standard, multi-stream transport demultiplexing ? multi-plane video/graphics display controller ? advanced 2d graphics accelerator ? pcm audio i/o ? opencable pod interface ? peripheral i/o interfaces ? 32-bit arm940t cable modem host cpu ? cable modem mac ? ethernet mac ? cable modem downstream phy ? cable modem upstream phy ? dvs 178 downstream phy www.conexant.com general information: u.s. and canada: (800) 854-8099 international: (949) 483-6996 headquarters C newport beach 4311 jamboree rd, p.o. box c newport beach, ca 92660-3095 order# 101991b audio dac s composite s-v ideo rgb f s /pdif lr 1 394 usb 1 394 link and phy ethernet phy x32 st b sdra m p eripheral i/o x1 6 cable modem sdram fla sh eeprom broadcast t uner data t uner CX24430/1 hard disk interface CX24430/1 system diagram
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