SAA7215HSSLASHC2 datasheet(5/20 Pages) PHILIPS

5 / 20 page

1999 Aug 25

Philips Semiconductors

Preliminary speciﬁcation

STB5860 (Set-Top Box) STB concept

OM5730

• Volume control for linear PCM samples in three steps:

−6, −12 and −18 dB

• Burst-formatting of AC-3 elementary streams and

MPEG-2 multi-channel streams in ES or PES format for

interconnection with an external multi-channel decoder

via the digital audio output or the IEC 958 output

• Serial multi-channel digital audio output with

16, 18, 20 or 24 bits/sample, compatible either to I2Sor

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 and 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 16M 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 1 K pixel

with programmable shape

• Supported shapes are 8 × 128, 16 × 64, 32 × 32,

× 16 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.

GENERAL DESCRIPTION

2.1

Introduction

The 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.

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