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GENERAL DESCRIPTION

Introduction

The Philips Semiconductors Set-Top Box (STB) concept is a Digital Media Broadcast (DMB) platform designed to help developers bring the right product to market at the right time, with a minimum of risk. A complete hardware and software solution for fully-featured digital cable,

satellite and terrestrial system; it is based around a powerful, programmable embedded microprocessor core, allowing manufacturers to develop and rapidly evaluate system designs and test application software. This programmability is the key to maintaining flexibility and reducing risk. Application software can be easily modified to meet changing requirements, so highly featured and differentiated STB designs can be brought quickly to market. It also allows flexible handling of graphics, so manufacturers can implement menus, Electronic Program Guides and the sophisticated graphics-based features expected by today’s users.

FEATURES

SAA7219 features

GENERAL SAA7219 FEATURES

? Internal PR3930 32-bit RISC processor running at 81 MHz

? Comprehensive driver software and development tool support

? A JTAG interface for board test support

? 8-kbyte 8-way set associative instruction cache

? 4-kbyte 4-way set associative instruction cache.

MPEG2SYSTEMS FEATURES

? Parsing of Transport Stream (TS), Philips Semiconductors hardware and proprietary software

data streams; maximum input rate is 108 Mbits/s

? A real time descrambler consisting of 3 modules:

– A control word bank containing 14 pairs (odd and even) of control words and a default control word

– The Digital Video Broadcasting (DVB) descrambler core implementing the stream decipher and block decipher algorithms

– The MULTI2 descrambler algorithm implementing the CBC and OFB mode descrambling functions.

? Hardware section filtering based on 32 different Packe Identifiers (PIDs) with a flexible number of filter conditions (8 or 4-byte condition plus 8 or 4-byte mask per PID and a total filter capacity of 40 (8-byte condition checks) or up to 80 (4-byte condition checks) filter conditions

? 4 Transport Stream/Packetized Elementary Stream (PES) filters for retrieval of data at TS or PES level for applications such as subtitling, TXT or retrieval of private data

? Flexible Direct Memory Access (DMA) based storage of the 32 section substreams and 4 TS/PES data substreams in the external memory

? System time base management with a double counter mechanism for clock control and discontinuity handling 2 Presentation Time Stamp (PTS)/Decoding Time Stamp (DTS) timers

? A General Purpose/High speed (GP/HS) filter which can serve as alternative input from e.g. IEEE 1394 devices It can also output either scrambled or descrambled TS to IEEE 1394 devices.