ST STi7109 HDTV STB解决方案

       ST 公司的STi7109 是用于H.264 和Microsoft WMA9的低成本HDTV 机顶盒（STB）解码器。这种新一代高清晰解码器能为低成本的高清（HD）系统提供非常高的性能。

       该器件采用Omega2 (STBus)架构，是地面数字电视，卫星与有线电视，DSL 与 IP高清机顶盒的后端处理器，完全和ATSC, SMPTE VC-1, DVB, DIRECTV, DCII, OpenCable 以及ARIB BS4标准兼容。它也适合于DVD的处理应用。本文介绍了STi7109的主要特性，方框图以及低成本卫星HD 机顶盒，有线电视HD 机顶盒，卫星和地面数字电视HD 机顶盒，和HD  IP-TV机顶盒的应用方框图。

 Low-cost HDTV set-top box decoder for H.264 and Microsoft WMA9
The STi7109 is a new generation, high-definition set-top box / DVD decoder chip, and
provides very high performance for low-cost HD systems. STi7109 includes both Windows Media Video 9 and H.264 video decoders for new, low bit rate applications.
Based on the Omega2 (STBus) architecture, this system-on-chip is a full back-end
processor for digital terrestrial, satellite, cable, DSL and IP client high-definition set-top
boxes, compliant with ATSC, SMPTE VC-1, DVB, DIRECTV, DCII, OpenCable and ARIB BS4 specifications. It includes all processing for DVD applications.

The STi7109 demultiplexes, decrypts and decodes HD or SD video streams with associated multichannel audio. Video is output to two independently formatted displays: a full resolution display intended for a TV monitor, and a downsampled display intended for a VCR or DVDR.

Connection to a TV or display panel can be analog through the DACs, or digital through a copy protected DVI/HDMI. Composite outputs are provided for connection to the VCR with Macrovision protection. Audio is output with optional PCM mixing to an S/PDIF interface, PCM interface, or through integrated stereo audio DACs.
Digitized analog programs can also be input to the STi7109 for reformatting and display.

The STi7109 includes a graphics rendering and display capability with a 2D graphics
accelerator, three graphics planes and a cursor plane. A dual display compositor provides mixing of graphics and video with independent composition for each of the TV and VCR/DVD-R outputs.
The STi7109 includes a stream merger to allow seven different transport streams from
different sources to be merged and processed concurrently. Applications include DVR timeshifted viewing of a terrestrial program, while acquiring an EPG/data stream from a satellite or cable front end.

The flexible descrambling engine is compatible with required standards including DVB, DES,AES and Multi2.
The STi7109 embeds a 266 MHz ST40-202 CPU for applications and device control. A dual DDR1 SDRAM memory interface is used for higher performance, to allow the video decoder the required memory bandwidth for VC-1/HD H.264 and sufficient bandwidth for the CPU and the rest of the system. A second memory bus is also provided for flash memory, storing resident software, and for connection of peripherals. This bus also has a high speed synchronous mode that can be used to exchange data between two STi7109 devices. This can be used to connect a second STi7109 as a co-decoder for a dual TV STB application.

A hard-disk drive (HDD) can be connected either to the serial ATA interface, or as an
expansion drive through the USB 2.0 port.
For IP-TV applications, the integrated 100BT Ethernet controller and MII/RMII interface can be used for generic Ethernet delivery.
The USB or Ethernet interfaces can also be used to connect to a DOCSIS 2.0 CM gateway for interactive cable applications.
The STi7109 is supported by STMicroelectronics’ STAPI software, and is compatible with the STx7100 and STi7710.

       主要特性：
The STi7109 is a single-chip, high-definition video decoder including:
Microsoft® VC-1, WMA9 and H.264 support
Linux® , Windows® CE and OS21 compatible ST40 CPU core: 266 MHz
transport filtering and descrambling
video decoder: VC-1 (including WMA 9),H.264 (MPEG-4 part 10) and MPEG-2
SVP compliant
Windows® DRM support
graphics engine and dual display: standard and high-definition
audio decoder: including Windows Media®Audio 9 (WMA-9) and WMA-9 Pro
DVD data retrieval and decryption
The STi7109 also features the following embedded interfaces:
USB 2.0 host controller/PHY interface
DVI/HDMI™ output
digital audio and video auxiliary inputs
low-cost modem
100BT ethernet controller with integrated MAC and MII/RMII interface for external PHY
serial ATA (SATA)

       图1。STi7109方框图

图2。低成本卫星HD 机顶盒应用方框图

     图3。带返回通道的低成本有线电视HD 机顶盒应用方框图

     图4。带HDD 和 DVD双路低成本卫星和地面数字电视HD 机顶盒应用方框图

图4。带HDD 低成本HD  IP-TV机顶盒应用方框图

本文来源：意法半导体     作者：

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