EM8400 データシートの表示（PDF） - Unspecified

部品番号

コンポーネント説明

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EM8400

MPEG-2 Decoder for Set-top, DVD and Streaming Applications

Unspecified 

EM8400, EM8401

Video Display Controller

The display controller reads picture data from DRAM and

displays it with proper format, timing and synchronization sig-

nals. This is a real-time process driven by the video clock.

The display controller operates in one of four modes:

• Master mode -- the display controller generates HSYNC and

VSYNC using an internal or external video clock up to 80

MHz

• Slave mode -- the display controller receives HSYNC and

VSYNC using an internal or external video clock up to 80

MHz

The video display timing can be set for interlaced or non-

interlaced (progressive) video output up to 120 Hz.

Sub-Pictures

Sub-pictures are compressed bit maps overlaid on decoded

MPEG video which can be scrolled up and down and faded

in and out. The area, content, color and contrast in every

video field can be changed. These modifications produce

special effects such as highlighting.

OSD (On-Screen Display)

The OSD enables simple full screen graphical menus to be

displayed and blended with the MPEG decoded video and

sub-picture. It supports 4 palletized color depths: 4 colors (2

bits per pixel), 16 colors (4 bits per pixel), 128 colors (7 bits

per pixel) and 256 colors (8 bits per pixel). The bit map can

be compressed using Run-Length Coding (RLC) in 2-, 4- and

7-bit per pixel modes. A 256x32 color look-up table (CLUT) is

provided to convert the 2-, 4-, 7- or 8-bit code into a 24-bit

YCbCr color and 16 levels of alpha blending. The highlight

function is supported in 2-, 4- and 7-bit per pixel modes.

Letterbox Display

Letterbox mode provides vertical downscaling; 16:9 pictures

can be displayed in a letterbox fashion on a traditional 4:3

display.

Pan and Scan Display

Pan and scan mode expands the video image to 16:9. A sec-

tion of the image can be displayed at full height on a 4:3 TV

display.

Alpha Blending

Alpha blending provides two layers of blending: sub-picture

over the MPEG video and OSD over both the sub-picture

and MPEG video. Up to 16 levels of blending are available.

Video Output Interfaces

Video output ports provide digital YCbCr outputs and include

an integrated NTSC/PAL video encoder and video DACs for

composite and s-video analog outputs.

VBI Support

NTSC closed captioning on lines 21 and 284 is supported.

Digital Video Output

The digital video output, controlled by the video display con-

troller, supports 8- / 16-bit CCIR 601 / 656 4:2:2 YCbCr data.

It may be operated as a timing master or slave at rates up to

80 MHz (160 MBps) and resolutions up to 720p or 1080i.

TV Encoder - Composite and S-Video Output

A high-quality NTSC/PAL encoder (with optional Macrovision

v7.1 protection) that supports the NTSC, PAL, PAL-60 and

PAL-M video standards is available. It features three 10-bit

video DACs to generate simultaneous composite and s-

video outputs. The analog video outputs are capable of driv-

ing a doubly-terminated 75-ohm load.

Sigma Designs, Inc.

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

www.sigmadesigns.com • sales@sigmadesigns.com

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