em8471 ETC-unknow, em8471 Datasheet - Page 2

• Manufacturer Part Number: em8471
• Description: Mpeg Decoder Set-top Streaming Applications
• Manufacturer: ETC-unknow

Bitstream Demultiplexing
The host processor performs MPEG-4 file demultiplexing and system decod-
ing (except audio and video decoding), MPEG-2 transport and program
stream and MPEG-1 system stream demultiplexing. The EM847x operates as
a PCI bus master while audio and video elementary streams are transferred
from host system memory to EM847x memory by the EM847x’s DMA engine.
Software drivers for the x86, available from Sigma Designs, include MPEG-4
audio decode, MPEG-2 transport and program stream demultiplex, MPEG-1
system stream demultiplex and DVD-Video/SVCD/VCD stream demultiplex
and navigation. Supported operating systems for our x86-based reference
designs include Windows
other operating systems and hardware platforms, our Professional Services
Group can assist in supporting your requirements.
DVD-Video Decryption
The EM847x includes decryption logic and supports DVD-Video CSS proce-
dural specifications. It also fully supports DVD-Video control features includ-
ing up to 8 language sound tracks, 32 subtitle settings, letterbox, pan and
scan, multi-angles and 3:2 pull-down.
MPEG Video Decoding
The MPEG video decoder engine contains the following modules used for
MPEG-1, MPEG-2 and MPEG-4 video decoding:
The Huffman Decoder receives bitstream data from DRAM and works in col-
laboration with the internal RISC processor to decode bitstream elements
down to the block level. It then decodes transformed coefficients and sends
them to the Inverse Quantizer. The Inverse Quantizer mainly performs two
consecutive multiplications on the transformed coefficients (quantizer scale
and quantizer matrix) and sends them to the IDCT. The IDCT converts them
into pixels (or pixel differences for non-intra pictures), which are sent to the
Motion Compensation block. The Motion Compensation block loads decoded
macroblocks from DRAM (for prediction), adds the pixel differences and
stores the result back to DRAM.
- 2 -
• MPEG-1 & 2 Huffman Decoder
• MPEG-4 Huffman Decoder
• Motion Compensation
• IDCT
• Inverse Quantizer
• AC / DC Predictor
355 Fairview Way • Milpitas, CA, USA 95035 • Tel: [phone] • Fax: [phone]
®
XP Embedded, Windows CE .NET and Linux. For
www.sigmadesigns.com • [e-mail]
Sigma Designs, Inc.
Common Features
• Programmable display output with improved
• 2-, 4-, 7- or 8-bit OSD with optional run-length
• 80 MHz digital video output interface: 8- or 16-
• Improved NTSC/PAL composite and s-video
• Digital audio output interface: I2S for PCM or
• Improved PCI v2.1 bus master / slave interface
• 2.5V core with 3.3V I/O (5V tolerant) for low
• Package: 208 PQFP for EM8470 and EM8471
EM8475 / EM8476 Features
• Digital audio input interface: I2S
• 80 MHz digital video input interface: 8- or 16-
• 80 MHz 24-bit digital RGB output interface for
• Interlaced or progressive analog RGB or
• Stereo audio DACs
• Flexible Local Bus interface
Applications
• Consumer products needing PVR and
• Set-top boxes, media/home gateways, video
scaling up to 1920x1080 resolution, interlaced
or progressive, up to 120 Hz refresh
compression, alpha blending and flicker
filtering
bit CCIR 601 / 656 YCbCr
outputs with optional Macrovision v7.1
protection and VBI data support (10-bit DACs)
S/PDIF (IEC 60958) for PCM, compressed
Dolby Digital and compressed DTS
supports both read and write operations
power operation
(pin compatible with EM8400), 328 BGA for
EM8475 and EM8476
bit CCIR 601 / 656 YCbCr supporting
resolutions up to 1920x1080i
DVI with HDCP support
YPbPr video outputs with optional Macrovision
AGC v1.03 protection and VBI data support
(10-bit DACs)
playback of video-on-demand (VOD),
streaming video, progressive DVD
end points, convergence appliances