digital infotainment products lnteractive TV Decoders CX22490/22496 Single-Chip Interactive TV Solutions Conexant’s interactive TV decoder products provide complete system solutions for the core electronics of high-performance set top boxes deployed in digital satellite, cable or terrestrial TV networks. The CX22490 and CX22496 offer an advanced, embedded 32-bit RISC CPU, an MPEG-2 audio/video decoder and 2D graphics performance. This combination enables consumer electronics manufacturers to build low-cost digital TV set top boxes to support a wide range of advanced, interactive, consumer entertainment services. Distinguishing Features CX22490/22496-based set top box system The CX22490 and CX22491 combine an MP@ML MPEG-2 video decoder, a digital audio decoder, a programmable MPEG-2/DVB/ ATSC/DSS transport stream demultiplexer, a high-speed 2D graphics rendering engine, and an advanced display compositing engine with a high-performance, embedded 32-bit 175 MIPS ARM940T RISC processor and integrated peripheral I/O ports. These secondgeneration interactive TV decoders share a common core feature set. The CX22490 adds USB and IDE multiword DMA support to the core features, while the CX22496 adds NDS CA hardware support. • MPEG-2 A/V decoding, Dolby Digital decoding • Dedicated RISC-based transport stream processor • High-performance 32-bit 175 MIPS integrated CPU (ARM940T) • High-performance 2D graphics rendering acceleration • Multiplane video/graphics compositing and display engine • High-performance unified memory controller architecture • Full suite of set top peripheral I/O interface controllers digital infotainment products lnteractive TV Decoders CX22490/22496 Fast CPU and Graphics Entry-level interactive TV lets viewers do more The CX22490/22496’s powerful 32-bit RISC than just watch programs. It upgrades the TV’s processor and advanced video/graphics display user navigation interface from a simple Electronic controller provide a platform ideally suited to Program Guide (EPG) to a more sophisticated support Internet access and interactive multimedia application for both digital TV programming and applications. The CPU core easily handles computa- enhanced information services. The services typically tionally intensive host signal processing tasks for offered include local news and weather, interactive Internet applications, such as codecs for streaming advertising and simple games. audio, Internet telephony, speech and video. Additionally, the CX22490/22496 provides ample CPU An enhanced TV set top box requires more processing power to support implementation memory than a basic box for TV viewing. Conexant’s of a complete, low-speed modem datapump and interactive TV decoders feature an innovative, unified controller in software. memory architecture that reduces memory costs by servicing all system requirements in a single, flexible, Low-Cost ICs for Entry-Level Interactive TV external 4 MB SDRAM buffer. System hardware costs Conexant’s interactive TV decoders feature all are further minimized by implementing analog the major subsystems required to implement the modem return path functionality in software running core system and decoder electronics of a digital on the 175 MIPS embedded ARM940T CPU. This interactive TV set top box. This includes an MPEG-2 embedded CPU offers ample resources to power A/V decoder (Dolby Digital audio is optional), a 32-bit a 2,400-baud software modem datapump and RISC CPU, a 2D graphics accelerator, a video/graphics controller, in addition to servicing all interactive display compositing controller and a set of peripheral TV system requirements. I/O ports for set top box front and back panel you only need to add a TV encoder, tuner/demodulator, Expandable to Advanced Interactive Set Top Box Platform modem codec, audio DAC, SDRAM and flash Moving beyond the entry level, many operators are memory ICs. offering a “walled garden” suite of truly interactive connectors. For a complete system hardware design, online applications accessible through the TV. They This high level of system-on-chip integration delivers deliver services using both the digital broadcast the low-cost system bill of materials sought after stream and an analog telco modem, typically V.34 by mainstream digital, multichannel TV operators. At or V.90. Interactive applications for this class of the same time, our ICs offer an advanced hardware platform include banking and shopping from home, capability for entry-level interactive or enhanced TV. and possibly limited Internet access and e-mail What is an Interactive TV Decoder? An interactive TV decoder is a device that enables a set top box connected to a digital TV network, to deliver both digital TV programming and information services to a TV set. The basic functions performed by an interactive TV decoder include identifying and filtering specific programs embedded in a compressed digital TV data stream, and capabilities. Conexant’s interactive TV decoders offer CPU and decompressing the video and audio data associated with graphics performance ideally suited for such mid-range interactive the selected program. This generates the TV program’s TV set top boxes, in which a system can be implemented using picture and sound. An interactive TV decoder can also 8 MB or 16 MB of SDRAM, depending on the functionality desired. Conexant’s powerful video/graphics display compositing engine identify and filter information sent in the digital TV data supports up to six independent image planes to enable the stream. Data pertaining to interactive applications is rich visual interface required for simultaneous TV viewing and processed by the interactive TV decoder’s embedded CPU application interaction. In addition, Conexant’s 2D graphics rendering engine can composite an unlimited number of graphics under OS control, and generates a graphical user interface planes with transparency into a single displayable OSD plane. that can be navigated using the set top box’s remote control unit. More advanced interactive systems on high-bandwidth cable networks go even further. They offer full Internet access, including Web browsing, e-mail and chat applications. The interactive TV decoder’s graphics-controller function Conexant’s architecture scales up to satisfy the requirements of allows both the TV picture and application user interface this computer-centric set top box model with a high-performance, graphics to be presented as a single image on the TV, using 133 MHz, 32-bit SDRAM memory controller and a 160 MHz, 32-bit CPU providing 160 MIPS dedicated to OS and a variety of video/graphics image scaling, filtering and application execution. blending techniques. The interactive TV decoder must also provide a return channel data communications mechanism A high-performance 2D graphics rendering engine accelerates 8/16/32bpp graphics screen updates to support multiple to allow the application to interact with the broadcast data overlapping graphics screen surfaces. The display-compositing source. This is typically done via a telco or cable modem. engine enables picture-in-graphics, flicker filtering, alpha Finally, the interactive TV decoder should be able to blending and other effects. The CX22490 supports direct attachment to an IDE hard disk drive for video pause and decrypt TV program and application content which has Web-browser caching applications. been encrypted by the service provider to protect against unauthorized access to services. Support for this kind of conditional-access system is usually implemented via smart card technology, combined with an embedded decryption circuit. features and specifications Full-Featured Development Platform VxWorks runtime and driver software components. The These ICs are packaged in a fully-engineered interactive development platform set-top box hardware has a modular TV decoder development system that runs on third-party design, allowing OEMs to configure the system with their interactive middleware/RTOS platforms and provides choice of tuner/demodulator, analog modem, TV encoder, complete set top box functionality. The initial platform audio DAC and SDRAM buffer size. comes equipped with fully-integrated OpenTV, pSOS and CX22490/22496 block diagram Product Features • MPEG-2 MP@ML video decoder supporting NTSC and PAL CCIR601 image resolution • MPEG-1/MPEG-2 audio decoder and Dolby Digital (AC3) • MPEG-2/DVB/ATSC/DSS transport stream demultiplexing • Integrated DVB common descrambler • NDS conditional access embedded in the CX22496 • 160 MHz 175 MIPS 32-bit ARM940T CPU • Advanced 2D graphics rendering for bitblt, textblt, line draw and color expansion acceleration • Unified memory architecture supporting 32-bit, 133 MHz SDRAM www.conexant.com © 2001, Conexant Systems, Inc. All Rights Reserved. General Information: Conexant and the Conexant logo are trademarks of Conexant Systems, Inc. Other trademarks are U.S. and Canada: (800) 854-8099 owned by their respective owners. 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Conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. • MPEG picture and still plane upscaling and downscaling • Multiplane video/graphics image compositing with color key or 256-level alpha blending • Video-picture-in-graphics and video-picture-in-video-picture support • Flicker filtering, aspect ratio conversion and hardware cursor • 4/8/16/32-bit RGB/YCrCb graphics • PCM audio mix and playback – USB 1.1 OHCI host controller (CX22490 only) – IDE multiword DMA support (CX22490 only) • Serial, I2C and GPIO ports • Bi-directional IR controller and dual smart card controllers