SAA7201H/C1/S1 查看數據表（PDF） - Philips Electronics

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SAA7201H/C1/S1

3.3 V, integrated MPEG2 AVG decoder / QFP160 Package

Philips Electronics 

Philips Semiconductors

Integrated MPEG2 AVG decoder

Objective specification

SAA7201

Graphics unit

The SAA7201 incorporates the display support for pixel

based graphics. Possible applications are the user

interface, logos and subtitling. Graphical data should be

grouped logically in regions and will be displayed in boxes

at the screen.

The definition of each region in the decoder consists of

four parts being a region descriptor, a top-field descriptor,

a bottom-field descriptor and a table-data descriptor:

• The region descriptor contains information relevant for

the full region like format, size, position and pointers to

the other descriptors.

• The top-field and bottom-field descriptor contain a pixel

based bit-map for the contents of that region for both

fields independently. The bit-maps can be stored in

either straight forward or in a compressed bit-map

format.

• The table-data descriptor defines the tables to be used

for the transformation of bit-maps to display colours.

All descriptors should be loaded under control of the

external CPU in the external memory.

The appearance of graphical data at the display is

determined by the assembly of region descriptors in a so

called display list. An example of such a display list for the

4 regions example is shown in Fig.9.

handbook, full pagewidth

V-start (2)

V-size (2)

H-start (2)

H-size (2)

REGION-1 (VBI-SIGNALS)

REGION-2

REGION-3 (256 ENTRY CLUT)

REGION-4

active

video

Fig.8 Graphics unit.

active

video

MGD328

handbook, full pagewidth

1997 Jan 29

gfx

anchor

address

128 bit

DESCRIPTOR 1

DESCRIPTOR 2

DESCRIPTOR 3

DESCRIPTOR 4

eodl

table

data

position, size, format

pointers to locations in SDRAM

CLUT

MAP

PIXEL

DATA

PIXEL bottom-field

DATA

top-field

MGD329

Fig.9 Display list.

16

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