SAA7221 データシートの表示（PDF） - Philips Electronics

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SAA7221

Integrated MPEG AVGD decoders

Philips Electronics 

Philips Semiconductors

Integrated MPEG AVGD decoders

Preliminary specification

SAA7215; SAA7216; SAA7221

Graphics features

2 nearly identical graphics planes: the first graphics plane

commonly called the background plane and the second

graphics plane commonly called foreground plane.

The following features apply for both planes.

• Graphics is presented in boxes independent of video

format

• Boxes can be up to full screen allowing double buffer

display mechanism

• 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

• Conversion matrices available to allow any format on

any different data path (RGB or YCbCr)

• 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 bit/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 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

• Map table mechanism to specify a sub set of entries if

the CLUT is larger than required by the coded bit

pattern; supported map tables are 16 to 256, 4 to 256

and 4 to 16

• Up to 4 graphics boxes may overlap vertically even

inside one graphics layer thanks to the use of flexible

chained descriptors

• Graphics mechanism can be used for signal generation

in the vertical blanking interval; useful for teletext, wide

screen signalling, closed caption etc.

In addition to the previous listed features, the second

graphics plane sustains:

• Teletext insertion with automatic teletext data retrieving

from the external SDRAM.

Data manipulation unit

• Powerful 3D block move with different patterns for

source and destination area

• Dedicated events for video synchronization

• Scaling, format conversion and bit manipulation from a

chained list of instructions.

Cursor

• Size of 1024 pixels

• Programmable shape (8 × 128, 16 × 64, 32 × 32,

64 × 16 and 128 × 8)

• 16 colours available with a 4 level transparency mixing

with video and graphics

• 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)

• Cursor can be moved freely across the screen without

overlapping restrictions.

Digital output

• Programmable selection for the mixed graphics planes

with video for the CVBS and RGB outputs

• Digital video input/output interface on 8 bit,

27 MHz (CbYCrY multiplexed bus), at a CCIR-656

format.

Analog output

• Analog video output interface on both the RGB and

Y/C/CVBS formats available simultaneously

• PAL/NTSC/SECAM encoding (SAA7221HS only)

• Two DACs for CVBS, Y and C, CVBS running at

27 MHz 10-bit resolution

• Three DACs for R (Y), G (Cb) and B (Cr) running at

27 MHz; 9-bit resolution connected to a 10-bit input DAC

• Closed captioning and teletext encoding on CVBS

• Macrovision 7.01 and 6.1 encoding capability on

Y or CVBS and C or CVBS (SAA7216HS only).

2000 Jan 31

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