Preliminary
IBM39STB032xx
IBM39STB034xx
STB032xx and STB034xx Digital Set-Top Box Integrated Controllers
The decoder also supports MPEG-2 MP@ML compliance with 2MB memory. Only 2MB of memory are
needed to decode full CCIR601 resolution NTSC and PAL encoded MPEG-2 bitstreams. It performs real-time
decoding of all resolutions in 16-pixel multiples, up to and including 720x480x30 or 720x576x25. Horizontal
and vertical filters deliver high-quality video. Chrominance filtering and up-sampling to provide CCIR601 4:2:2
video output. Pan and scan are supported in 1/16 pel accuracy for 16:9 source material. Video rates range
from 1.5 Mbps to 15 Mbps (higher in bursts).
The MPEG-2 video decoder supports the European DVB standard and accepts Packetized Elementary or
Elementary MPEG-2 streams. It uses Packetized Elementary Stream (PES) video decoding to extract the
Presentation Time Stamp (PTS), and handles user data and other PES layer bit fields through memory
access from the PPC405B3. Input can be from transport or directly from system memory. Outputs are pro-
vided for video-only and for video-with-OSD.
The decoder can insert data in the vertical blanking interval (VBI) with VBI Output Support. It supports decod-
ing of still or fixed images and display of scaled video images. It also features:
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Letterbox format display
Selectable anti-flicker filtering
Output interface flexibility (programmable controls)
Composite blanking and Field ID signals
V-sync and H-sync signals
CCIR656 master and slave modes
Programmable signal polarity
Sophisticated error concealment
3:2 pull-down support.
Closed caption, teletext, or mixed (VPS)
(1/4x, 1/2x, 2x) and three graphic planes
Automated video channel change and time-base change features
Blending of external graphics.
A multi-plane on-screen display (OSD) uses bitmap data in memory to be merged with or displayed in place
of the motion video data. Three OSD planes (the cursor, graphics and image planes) are provided for
increased display flexibility. The OSD includes:
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Programmable background color
Multi-region link list graphic and image plane OSD with a color table for each region
Programmable bitmap resolution on a region-by-region basis
64 x 64 pixel, 16-color cursor plane with blending controls
Overlay and video blending of graphic plane
Enhanced color mode for 24-bit color (YUV) in Direct Color and CLUT modes with 8-bit alpha blending
Video shading in graphic plane OSD area
OSD control output for external multiplexer (picture-in-picture support)
Tiling capability in image and graphic planes
Scrolling of image and graphic planes
Horizontal scaling of image plane bitmaps
Animation support
16 MB OSD addressing range to support more and larger bitmaps.
MPEG-2 Transport and DVB Descrambler
The MPEG-2 transport demultiplexer provides ISO / IEC 13818-1 MPEG-2 transport system layer demulti-
plexing. Its integrated digital video broadcasting (DVB) descrambler complies with DVB system layer require-
ments and may be turned off for non-DVB applications. Peak input rates are 100-Mbps (parallel) or 60-Mbps
STB03_sds_041800.fm.01
April 18, 2000
Architecture and Subsystem Information
Page 9 of 55
IBM [ IBM ]
