em8401 ETC-unknow, em8401 Datasheet - Page 3

• Manufacturer Part Number: em8401
• Description: Mpeg-2 Decoder Set-top, Streaming Applications
• Manufacturer: ETC-unknow

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:
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.
• Master mode -- the display controller generates HSYNC and
• Slave mode -- the display controller receives HSYNC and
VSYNC using an internal or external video clock up to 80
MHz
VSYNC using an internal or external video clock up to 80
MHz
355 Fairview Way • Milpitas, CA, USA 95035 • Tel: [phone] • Fax: [phone]
www.sigmadesigns.com • [e-mail]
Sigma Designs, Inc.
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.
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