EM8470, EM8471, EM8475, EM8476

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Sigma Designs, Inc.

355 Fairview Way • Milpitas, CA, USA 95035 • Tel: 408.262.9003 • Fax: 408.957.9740

www.sigmadesigns.com • sales@sigmadesigns.com

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

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:

• MPEG-1 & 2 Huffman Decoder

• MPEG-4 Huffman Decoder

• Motion Compensation

•IDCT

• Inverse Quantizer

• AC / DC Predictor

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.

Common Features

• Programmable display output with improved

scaling up to 1920x1080 resolution, interlaced

or progressive, up to 120 Hz refresh

• 2-, 4-, 7- or 8-bit OSD with optional run-length

compression, alpha blending and flicker

filtering

• 80 MHz digital video output interface: 8- or 16-

bit CCIR 601 / 656 YCbCr

• Improved NTSC/PAL composite and s-video

outputs with optional Macrovision v7.1

protection and VBI data support (10-bit DACs)

• Digital audio output interface: I2S for PCM or

S/PDIF (IEC 60958) for PCM, compressed

Dolby Digital and compressed DTS

• Improved PCI v2.1 bus master / slave interface

supports both read and write operations

• 2.5V core with 3.3V I/O (5V tolerant) for low

power operation

• Package: 208 PQFP for EM8470 and EM8471

(pin compatible with EM8400), 328 BGA for

EM8475 and EM8476

EM8475 / EM8476 Features

• Digital audio input interface: I2S

• 80 MHz digital video input interface: 8- or 16-

bit CCIR 601 / 656 YCbCr supporting

resolutions up to 1920x1080i

• 80 MHz 24-bit digital RGB output interface for

DVI with HDCP support

• Interlaced or progressive analog RGB or

YPbPr video outputs with optional Macrovision

AGC v1.03 protection and VBI data support

(10-bit DACs)

• Stereo audio DACs

• Flexible Local Bus interface

Applications

• Consumer products needing PVR and

playback of video-on-demand (VOD),

streaming video, progressive DVD

• Set-top boxes, media/home gateways, video

end points, convergence appliances