博通BCM7420双路HD多格式STB SoC解决方案

博通(Broadcom)公司的BCM7420是双路HD多格式STB SoC解决方案,集成了用于家庭网络的MoCA调制解调器,1080p60质量的视频,1500-DMIPS的CPU,双路高清视频译码器(H.264,VC-1, MPEG-2, MPEG-4 Part 2, H.263,和DivX),支持mosaic视频,双路多功能音频译码器,PC级2D和3D图像处理,高质量视频缩放和运动补偿的逐行扫描,七个视频DAC,双立体声高保真音频DAC,以及用来控制STB的整套外设以及支持节能的动态功率控制器. BCM7420支持DDR2或DDR3存储器架构,还包括可编程的安全处理器和传输引擎,使解决方案非常适合用于有线电视,卫星电视,IP和数字电视以及零售商业模式.本文介绍了BCM7420系统的集成特性, 视频/音频/图像特性以及方框图.

BCM7420:Dual HD Multiformat STB SoC with MoCA Integrated Whole Home Media Center Gateway System
The BCM7420 redefines media center system integration: a MoCA modem for home networking, 1080p60 quality video, a 1500-DMIPS (Millions of Instructions per Second) CPU, a dual-channel high-definition video decoder (H.264,VC-1, MPEG-2, MPEG-4 Part 2, H.263,and DivX), mosaic video support, a dual-channel multifunction audio decoder, PC class 2D and 3D graphics processing, high-quality video scaling and
motion-compensated deinterlacing, seven video DACs, dual-stereo highfidelity audio DACs, and a suite of peripherals providing a variety of settop box control functions—all under the oversight of a dynamic power controller for energy efficiency. The BCM7420 supports either DDR2 or DDR3 memory architectures future-proofing the system design. The BCM7420 also contains a programmable security processor and transport
engine making the solution perfect for cable, satellite, IP, digital TV and retail business models.

The integrated 1.0/1.1+ MoCA Modem, PHY and on-chip RF transceiver incorporates a 200-DMIPS CPU, 256 QAM for bit loading and an extended frequency range. All flow control and processing is offloaded from the host processor. Support is included for Low-RF mode. The modem is driven by a dedicated on-chip Gbit Ethernet MAC for efficient data transfers and address learning, thereby achieving maximum actual system throughput. When used in conjunction with other Broadcom-enabled devices, additional performance can be realized. The controller is fieldprogrammable, allowing the service provider to tune performance for unique circumstances. When paired with a BCM3450 power amplifier/ low-noise filter, it forms a direct connection to a MoCA network.
The BCM7420 incorporates a 1500-DMIPS dual-threaded MIPS32™ microprocessor subsystem, including a floating point unit, memory mapping unit and deep data caches, thereby enabling a plethora of consumer applications such as Flash, Internet video decode formats, JPEGs, and much more.
The BCM7420 performs upscaling and conversion to 1080p60 of any source input (likewise for 50-Hz-based content to 1080p50). An on-chip filter reduces the effect of digitally captured analog capture noise. The same filter helps eliminate motion-induced encoded artifacts. A key feature is mosaic video support, where multiple live streams can be decoded and arrayed for unique channel guide applications Also included are  motionadaptive deinterlacing with 3:2 pull-down and letterbox detection. Digital noise reduction filters minimize mosquito noise, AVC/VC-1 low-encoded bit-rate noise, and MPEG artifacts, including block noise. Picture-inpicture, split picture, and independent picture in graphics are supported.
H.264 (AVC) support includes Main and High Profile to Level 4.1 for 720p and 1080i high definition for HD and to Level 3.1 for SD streams. AVC High Profile was added to the fidelity range extensions specifically to address the needs of consumer broadcast and playback applications. The video decoders also support high-definition VC-1 (Advanced Profile Level 3, Main, and Simple Profiles) and MPEG-2, Main Profile at Main and High
Levels. The BCM7420 has two advanced audio processors 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. This can be combined with transcoding and volume leveling. 3D SRS audio is also supported. Available audio outputs are I2S, S/PDIF, and two pairs of analog outputs.
High-quality video and graphics processing are integrated, featuring advanced studio-quality 2D and OpenGL ES 3D graphics processing. The 3D engine allows for the seamless use and blending of live video for stunning user interface effects.
The BCM7420 dual-stream analog video encoder supports either Macrovision® or Dwight Cavendish encoding options. Output formats include a complete suite of NTSC and PAL formats for worldwide application. The seven configurable DACS support composite, S-Video, SCART, RGB, and YPrPb component. The following output resolutions are supported: 480i, 480p, 576i, 576p, 720p, 1080i, and 1080p 24/30/50/60. The BCM7420 includes a HDMI interface and a channel 3/4 RF modulator. Both a direct HD digital output port and an ITU-R-656 output port are also available, as well as teletext sideband interface. Integrated peripherals include a 1394 MAC and PHY, UARTS, ISO7816 smart card interfaces, counter/timers, a GPIO, a LED/keypad controller, IR receivers, an IR blaster, two UHF remote control receivers, an integrated soft modem system side device, and BSC and SPI controllers. Advanced connectivity features include a PCI bus, a PCIe x1 port, three USB 2.0/1.1 ports, two SATA II ports, and a second Gigabit MAC, which can be configured to interface to on-chip 10/100 PHY, or to external Gigabit PHY via RGMII.

The transport processor is MPEG-2- and DVB- compliant, supporting external transport inputs and internal playback channels. Dedicated engines offload record, audio, video, and PCR processing, as well as message filtering, including DVR trick mode support. Encryption support includes 1DES/3DES/DVB/Multi2/AES.

BCM7420系统集成特性:
System communication
Complete Integrated MoCA 1.0/1.1+ 240 Mbps interface
200-DMIPS CPU/MAC/PHY/1.8 GHz Tuner
Ethernet to MoCA Bridging
Low-RF support included
Integrated 1394a MAC/PHY interface
10/100/1Gigabit Ethernet MAC, RGMII or 10/100 Ethernet PHY
Processing
1500+ DMIPS dual-threaded host processor wth FPU/ MMU
Programmable power management controller for EnergyStar®
Dual DDR2/DDR3 32-bit memory controllers
DDR2/DDR3 (667, 800, 1066)
Security, Conditional Access, DRM
Broadcom security processor
Tru2way ready with on-chip MCARD support
Dual SmartCard support
Device connectivity and control
Dual SATA II for DVR
Triple USB 2.0 host controller
HDMI 1.3a/DVI 1.0 MAC and PHY with HDCP 1.3
Integrated SiLab Si305x system side device for modem support
3.3V PCI 2.3
1x PCIe Gen 1 interface
Dual UHF remote control receiver
Dual IR remote control receiver and IR blaster
Video connectivity and support
HDMI/HDCP and Component HD/SD outputs
Simultaneous Composite and S-Video SD outputs
VBI encoders for CC/TTX with NABTS/CGMSA/WSS/Gemstar® standards and dedicated TTX sideband
RF modulator with BTSC encoder
HD_DVI input
HD_DVO and 656 output ports
Macrovision® 7.1 and Dwight Cavendish support options
SCART 1 and 2 support
BCM7420视频/音频/图像特性:
Dual advanced AVC/MPEG-2/VC-1 decoders
H.264/AVC Main and High Profile to Level 4.1
VC-1 Advanced Profile @ Level 3
VC-1 Simple and Main Profile
HD MPEG-2 and SD MPEG-2
MPEG still-picture decode
DivX® and MPEG-4 part 2 ASP decode
H.263
AVS option available
1080i60 Deinterlacer for “Full HD” 1080p50/60 Video Output
Supported on both HDMI and Component Outputs
Dual-channel advanced audio processor
AAC LC, AAC LC+SBR level 2, AAC+ level 2
Dolby® Digital, Dolby Digital Plus
MPEG I layers 1, 2, and 3 (MP3)
Windows Media® audio
Audio transcode and audio leveling
Pair of on-chip stereo high-fidelity audio DACs
3D SRS audio support
Dual I2S bidirectional ports
S/PDIF output
2D and 3D graphics drawing engines
Studio-quality text and graphics at HD resolution
Supports multiple layers and windows
Complete 3D graphics engine with OpenGL® ES 1.0 support
Digital Noise Reduction (DNR)
Reduces MPEG artifacts including block noise reduction
Reduces mosquito noise
Reduces low-bit-rate noise
Reduces Chroma noise
Motion Compensated Temporal Filtering
Reduces encoded artifacts in digital streams
Reduces motion induced artifacts
Reverse 3:2/2:2 pull-down
Letterbox detection



图1.BCM7420方框图