STV3550 datasheet(37/144 Pages) STMICROELECTRONICS

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Graphics Functional Description

STV3550

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Graphics Functional Description

Note:

Some descriptions in this section are not applicable for LCD applications.

4.1

On-Screen Display Generator (OSD)

4.1.1

General Information

The On-Screen Display (OSD) unit is used to overlay the video image with graphics or Teletext

information generated by software. The OSD pipeline uses color look-up tables (CLUTs) also called

palettes, with an 8-bit input. The CLUTs can then generate 256 predefined colors that are stored in

the external SDRAM. The CLUT also includes 8 bits for Transparency Mode control. The output

from the CLUT is in ARGB 32-bit/pixel format (8-A, 8-R, 8-G, 8-B). The OSD plane can consist of

several display regions. For each region, a different CLUT can be defined.

Before being mixed with the video signal, the OSD output can be filtered by Anti-Flicker and Anti-

Flutter filters. These filters are used to build an OSD plane in Progressive mode and store it in a

field-based format so that it may be displayed in Interlaced mode. Other display modes can be used

for a full-page graphic plane: Progressive mode or Non-Interlaced mode.

4.1.2

Main Features

●

8 bit per pixel Bitmap OSD with 10-bit RGB output resolution through a 32-bit CLUT

●

Up to 1920 pixels per line and 1024 lines per field

●

Capable of displaying Teletext 1.5 to 2.5, Teleweb and EPG applications

●

4 display planes (Video, Background, Graphics and Cursor) with mixing capabilities:

➢ Global, pixel-based and proportional mixing

➢ Programmable 8-bit color-based mixing factor for anti-aliasing effect on character edges

➢ Programmable 8-bit region-based mixing factor for transparency effect

●

Interlaced or Progressive Display Mode

●

Anti-Flicker and Anti-Flutter filters

●

2-D Graphics Accelerator

●

Programmable RGB gain and offset

●

Field- or frame-based storage

●

Embedded display special effects controlled by software

➢ Flash, Underline, Italics, Fringe, Rounding and Shadow

➢ Vertical Scrolling

➢ Horizontal Scrolling

➢ Rolling Scrolling

➢ Opening Window

4.1.3

Functional Description

The OSD function displays a user-defined bitmap over any part of the displayable (i.e. non-blanked)

screen, independent of the size and location of the active video area. This bitmap can be defined

independently for each field. The OSD is enabled by setting the OSDON bit in the OSD_CONFIG

decoded picture size and any pan/scan offset.

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