博通BCM7454 SD卫星电视机顶盒解决方案

博通(Broadcom)公司的BCM7454 是标准清晰度(SD)卫星电视机顶盒解决方案,提供AVC (H.264), MPEG-2和VC-1视频译码. BCM7454包括数据传输处理器,标清(SD) AVC/MPEG-2/VC-1视频译码器,高档音频译码器,2D图像处理,高质量视频缩放和运动自适应的逐行扫描,四个视频DAC,立体声高保真音频DAC, MIPS32/MIPS16e class CPU和提供各种机顶盒控制功能的外设控制单元.本文介绍了BCM7454的主要特性,主要优势和功能方框图以及AVC/MPEG-2/VC-1平台应用案例.

BCM7454: AVC/MPEG-2/VC-1/SD Output System-on-Chip Solution
The BCM7454 is a standard-definition satellite set-top box solution offering integrated AVC (H.264), MPEG-2, and VC-1 video decoding technology. It combines a data transport processor, standard-definition AVC/MPEG-2/VC-1 video decoder, advanced audio decoder, 2D graphics processing, high-quality video scaling and motion adaptive
deinterlacing, four video DACs, stereo high-fidelity audio DACs, a MIPS32/MIPS16e class CPU, and a peripheral control unit providing a variety of set-top box control functions.

The MPEG-2 DVB-compliant transport stream/PES parser and demultiplexer is capable of simultaneously processing 256 PIDs via 128 PID channels in up to two independent external transport stream inputs.

The transport provides 1DES/3DES/DVB/Multi2/AES descrambling support. A memory-to-memory DMA security module may be programmed for supporting AES/1DES/3DES/CSS/CPRM/CPPM/ DTCP copy protection algorithms/standards. The BCM7454 features the Broadcom Secure Processor providing secure key generation,
management, and protection.

The video decoder supports AVC, standard-definition VC-1 (advancedprofile level 3, main, and simple profiles), and MPEG-2 main profile at main and high levels. The BCM7454 has an advanced audio processor capable of decoding Dolby Digital, Dolby Digital Plus, AAC 5.1, AAC+ level 2, and MPEG-1 layers 1, 2, and 3 with simultaneous pass-through support. 3D SRS audio is also supported. Available audio outputs are I2S, SPDIF, and one pair of analog outputs.
High-quality video and graphics processing is integrated, featuring advanced studio quality 2D graphics processing. Also included are motion-adaptive deinterlacing with 3:2 pull-down and letterbox detection.

The BCM7454 has an analog video encoder that supports Macrovision and supports the following output standards: NTSC-M, NTSC-J, PALBDGHIN, PAL-M, and PAL-Nc. The following output formats are supported: composite, S-Video, and RGB component. The following output resolutions are supported: 480i, 480p, 576i, and 576p. The BCM7454 also supports modulated output over an RF 3/4.

The BCM7454 incorporates a complete MIPS32-based microprocessor subsystem, including caches with bridging to memory and a local bus. Integrated peripherals include three UARTS, two ISO7816 smart card interfaces, counter/timers, a GPIO, a LED/keypad controller, IR receivers, an IR blaster, an integrated soft modem system side device, and BSC and SPI controllers. Advanced connectivity features include two USB 2.0 ports.

BCM7454主要特性:
Advanced AVC/MPEG-2/VC-1 decoder:
H.264/AVC main and high profile to level 4.1
VC-1 simple, main, and advanced profile @ level 3
MPEG-2
MPEG still-picture decode
Advanced audio processor supporting the following:
AAC LC, AAC LC+SBR level 2, AAC+ level 2
Dolby Digital, Dolby Digital Plus
MPEG-1 layers 1, 2, and 3 (MP3)
Windows Media audio
One pair of on-chip stereo high-fidelity audio DACs
3D SRS audio support
One I2S input port and one I2S output port
SPDIF output
Advanced 2D-effects graphic engine:
Studio quality text and graphics at SD resolution
Supports multiple layers and windows
Digital noise reduction (DNR):
Reduces MPEG artifacts including block noise reduction
Reduces mosquito noise
OpenCable ready with on-chip MPOD support
300-MHz MIPS32/16e class processor
64-bit DDR DRAM controller configurable in 32-bit mode
BCM7454主要优势:
SD analog video encoder:
NTSC-M, NTSC-J, PAL-BDGHIN, PAL-M, PAL-Nc analog outputs
480i/480p/576i/576p output formats
Component or composite output
Macrovision® 7.1 support
Component, S-Video, and composite via six on chip
VBI encoders for CC/TTX with NABTS/CGMSA/WSS/ Gemstar® standards and dedicated TTX sideband
ITU-R-656 input port
RF modulator with BTSC encoder
Broadcom Security Processor
AES/1DES/3DES/CSS/CPRM/DTCP copy protection
MPEG-2/DIRECTV®/DVB/ARIB data transport demux with
1DES/3DES/DVB/Multi2/AES descramblers
V.92-capable soft modem with integrated SiLab Si305x system side device
3.3V 33-MHz PCI 2.2
Dual USB 2.0 host controller with dual-port transceiver
Dual smart card support



图1.BCM7454方框图



图2.AVC/MPEG-2/VC-1平台应用案例