OM5721 데이터 시트보기 (PDF) - Philips Electronics
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OM5721 Datasheet PDF : 20 Pages
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Philips Semiconductors
STB5660 (Set-Top Box) STB concept
Product specification
OM5721
• Serial multi-channel digital audio output with 16, 18, 20
or 24 bits/sample, compatible either to I2S or Japanese
formats. Output can be set to high-impedance mode via
the external controller.
• Serial Sony/Philips Digital Interface (SPDIF) (IEC 958)
audio output. Output can be set to high-impedance
mode.
1.2.6 GRAPHICS FEATURES
• Graphics is presented in boxes independent of video
format
• Boxes can be up to full screen allowing double buffer
display mechanism
• Two independent graphics planes are available for
background and/or graphics overlay
• Two independent data paths with RGB 4 : 4 : 4 and
YCbCr 4 : 2 : 2 formats available with independent
mixing
• RGB path transparent to YCbCr format
• Screen arrangement of boxes is determined by display
list mechanism which allows for multiple boxes,
background loading, fast switching, scrolling,
overlapping and fading of regions
• Real-time anti-flickering performed in hardware.
Programmable hardware available for off-line
anti-flickering.
• Hard-edged or soft-edged wiping of regions available
• Support of 2, 4, 8, 16 bits/pixel in fixed bit maps format
or coded in accordance to the DVB variable/run length
standard for region based graphics
• Chrominance down-sampling filter switched per region
• Display colours are obtained via Colour Look-Up Tables
(CLUT) or directly from bitmap. CLUT output can be
YCbCrT at 8-bit for each signal component thus
enabling 16 M different colours and 6-bit for T which
gives 64 mixing levels with video. CLUT output can also
be RGBT with same resolutions. Non-linear processing
available by means of LUTs.
• Conversion matrices available to allow any format on
any different data path (RGB or YCbCr)
• Graphics boxes may overlap vertically even inside one
graphics layer due to the use of flexible chained
descriptors
• Internal support for fast 3-D block moves in external
SDRAM through Data Manipulation Unit (DMU)
• DMU allows format conversion and bit manipulation
from a chained list of instructions
• Graphics mechanism can be used for signal generation
in the vertical blanking interval. Useful for teletext, wide
screen signalling, closed caption, etc.
• Support for a single down loadable cursor of 1K pixel
with programmable shape
• Supported shapes are 8 × 128 pixels, 16 × 64 pixels,
32 × 32 pixels, 64 × 16 pixels and 128 × 8 pixels
• Cursor colours obtained via two 16 entry CLUTs with
YCbCrT at 6, 4, 4 respectively
• 2 bits and RGBT at 4, 4, 4 respectively 4 bits (or 4, 5, 3,
respectively 4 bits). Mixing of cursor with video and
graphics in 4 levels.
• Cursor can be moved freely across the screen without
overlapping restrictions.
2 GENERAL DESCRIPTION
2.1 Introduction
Philips Semiconductors Set-Top Box (STB) concept is a
Digital Media Broadcast (DMB) platform designed to help
developers bring the right product to market at the right
time, with a minimum of risk. A complete hardware and
software solution for fully-featured digital cable, satellite
and terrestrial system, it is based around a powerful,
programmable embedded microprocessor core, allowing
manufacturers to develop and rapidly evaluate system
designs and test application software.
This programmability is the key to maintaining flexibility
and reducing risk. Application software can be easily
modified to meet changing requirements, so highly
featured and differentiated STB designs can be brought
quickly to market. It also allows flexible handling of
graphics, so manufacturers can implement menus,
electronic program guides and the sophisticated
graphics-based features expected by today’s users.
Sophisticated hardware is supported by a full suite of
software, developed in partnership with customers to meet
real-world needs and provide the reliability required for
consumer electronics products.
1999 May 05
5
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