ST 公司的STi7105是低成本高性能STB HD译码系统级芯片（SoC），目标应用在下一代HD STB（有线，地面，卫星电视，DSL，IP以及混合）。单片的STi7105集成了多流传输分路器，CPU，A/V译码，视频处理，图像和显示，先进的安全性，STB外设，音频/视频DAC，数字A/V输出，HDMI，e-SATA端口，两个USB端口和以太网MAC/MII/RMII。CPU的工作速率高达450 MHz ，提供大于800DMIPS的性能。本文介绍了STi7105的主要特性，方框图以及典型应用框图，包括带DOCSIS DVR线缆STB方框图，低成本IP客户端HD STB方框图，高清DVR卫星电视STB方框图以及带DVR和WiFi家庭网络的混合DTT/广播STB方框图。
STi7105 Low cost advanced HD decoding IC for STB
The STi7105 provides a solution for operators to specify a range of low-cost, high performance HD STBs including low-cost Zappers, IP clients, Interactive STBs, DVR standalone and DVR server/home network capable STBs, and with content delivery possible using broadcast or broadband networks, or both (hybrid STBs). The STi7105 keeps pace with the latest conditional access, DRM and trusted platform requirements of major operators worldwide by incorporating the latest generation of advanced security features.
The STi7105 offers current users of STs growing family of advanced decoding Ics enhancements in performance and features whilst reducing cost and time-to-market for the next generation deployments.
The STi7105 uses state of the art process technology to provide an ultra low-cost, fully featured HD AVC decoder IC. It is a highly integrated system-on-chip suitable for STB markets across all networks (cable/satellite/DTT/x- DSL/IP) worldwide.
The STi7105 is targeted at the latest Operator and CE manufacturer requirements for STBs which utilize advanced HD decoding (H264/VC-1/MPEG2), and which conform to DVB, ISMA, ATIS-IIF, SCTE, DirecTV, ATSC, ARIB, CEA, ITU, OpenCable and MSTV specifications.
STi7105主要特性：
The STi7105 is a new, advanced decoding SoC targeted at next generation HD STBs (cable, terrestrial, satellite, DSL, IP, and Hybrid), and has the following features:
Integrates in a single IC, Multi-stream transport demux, CPU, A/V decode, Video processing, Graphics and Display, Advanced security, STB peripherals, Audio/Video DACs, Digital A/V outputs, HDMI, e-SATA port, dual USB ports and Ethernet
MAC/MII/RMII
High performance CPUs for applications (ST40) and audio/video decoding (2 x ST231)
ST40-300, dual-issue, applications CPU, 32KI, 32KD caches:
Target speed > 450 MHz delivering > 800DMIPs
Single 32-bit DDR1/DDR2 Local Memory Interface (LMI), up to 400 MHz
Latest generation “Delta” Video Decoder with ST231 programmable CPU core:
MPEG2, H264, VC-1/WM9, HD or SD Advanced Video Decoding
AVS SD decoding
Provides flexibility to support other codecs (DivX, XviD, H263 encode/decode)
HD and SD decoding or dual SD Decoding, PIP & Mosaic capable
Real-time transcoding of MPEG2 SD to H264 SIF
Advanced de-blocking and de-ringing of decoded MPEG2 SD sources based on ST’s DSE (Digital Source Enhancer) Technology with 2D analysis window and Texture Adaptive Filter
ST231 CPU based Audio Decoder. MPEG1 I/II, MP3, Dolby Digital/DD+, MPEG4 AAC/AAC+ multi-channel audio decoding. Concurrent audio description decoding. DD+ and AAC+ transcoding
Main and Aux Video display pipelines:
Main: high quality H & V reformatting/resizing with sample rate conversion/filtering. Motion adaptive spatial and temporal de-interlacing for 480p/576p and 1080p60 progressive output
Aux: high quality H & V reformatting/resizing with sample rate conversion/filtering
Three independent graphics planes with H&V resize, CLUT and anti-flicker filtering
Link list based 2D graphics blitter. Up to 200 Mpixels/sec with destination alpha blending. Capable of 3D user interface effects.
Independent Main and Aux display compositions (Video/Graphics mixing)
Pass-through display for graphics, main video or aux video output concurrently with main and aux compositions
HD display capture and down-conversion for concurrent HD and SD output of the main composition
HDMI interface with HDCP copy protection (HD/ED/SD formats up to 1080p60). HDMI interface is in full compliance with all features of v1.3a, excluding deep color, enhanced colorimetry (xvYCC, gamut metadata), and DST/DSD audio features.
16-bit Digital Video Output for main display composition (HD/ED/SD formats up to 1080p60)
Second 24-bit Digital Video Output for pass through display or main/aux display compositions (HD/ED/SD formats up to 1080p60)
Macrovision and Dwight Cavendish copy protection support
PAL/NTSC/SECAM Digital encoder
Six 10-bit DACs for component/composite analog video output (HD/ED/SD formats up to 1080i)
SD/HD Digital Video Input port, 8- or 16-bit YCbCr
Integrated Stereo Audio DAC
Six-channel Audio PCM Output Interface
Stereo Audio PCM Input Interface
Independent SPDIF output
Quadruple external TS inputs, triple internal TS from memory
Dual DVB-CI+ (HD/SD profiles) modules supported
Multi-stream transport stream de-multiplexing, 333 Mbits/sec, Quadruple tuner DVR capable
DVB/DES/AES/Multi-2/ICAM descrambling
CSS (DVD-video), CPRM (DVD-RW), and CPPM (DVD-audio) decryption is provided for the DVD stream.
Dual USB 2.0 host interfaces both with PHY
Integrated 10/100 Ethernet MAC/MII/RMII, Wake on LAN, 75 MHz (300 Mbits/sec) capable
16-bit External Memory and Peripheral Interface (EMI) - up to five banks
Interfacing to, and boot from, NOR or NAND FLASH
Interfacing to, and boot from, serial FLASH
32-bit, 66 MHz, PCI Interface, shared on EMI with access interleaving possible
MPX Interface/protocol for high speed, glue-less, communications with STv0498 DOCSIS Cable FE
DVR supported, with HDD attachment through e-SATA, EIDE (PIO mode) or USB
Soft Modem support: integrated MAFE: integrated system side DAA (Si-Labs)
Dual Multi-channel Flexible DMA Controllers
STB Peripherals
Two Smart Card interfaces, four UARTs, four SSC/I2C, GPIO banks with alternate functions, IR Tx/Rx, UHF Rx/SCD, PWM, ILC, HDMI CEC, 4 x 4 key matrix scanner
Advanced security - Secure control words, Code authentication, JTAG locking, Network/DVR copy protection, SVP, VGS, DTCP-IP, MS-DRM, MSTV
Package - FPGBA 27 x 27mm, 620 balls, 7R32x32, Pitch 0.8 mm, Ball 0.5 mm.
图1。STi7105方框图
图2。采用STi7105带DOCSIS DVR线缆STB方框图
图3。低成本IP客户端HD STB方框图（有线连接以太网或WiFi连接）
图4。高清DVR卫星电视STB方框图
图5。带DVR和WiFi家庭网络的混合DTT/广播STB方框图
