STV3550 datasheet(54/144 Pages) STMICROELECTRONICS

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STV3550

The Picture Compositor is a real-time multilayer (or multiplane) digital mixer. It can compose a

single output stream from up to four sources:

●

Background color plane (programmable register)

●

Video plane (D1 input, once captured into the local memory)

●

Cursor plane

●

On-Screen Display (OSD) and Graphics (GFX) plane

4.4.1

Background Color Plane

The background color is stored in a 24-bit RGB register that acts as a full-screen plane filled with a

solid color. This plane is always opaque with no alpha value associated. It will be seen on each

screen location, according to the resulting transparency of all the foreground planes.

This plane, associated with the video plane and its mixing factor, can perform a contrast function

used to adjust the contrast of the video plane, independently of the OSD plane.

4.4.2

Video Plane

The Video Display Pipeline provides a video stream that can be resized and pre-processed on the

video input port. The video plane has the following characteristics:

●

YCbCr 4:4:4 format with 10-components,

●

SD format compatible,

●

Single Viewport mechanism with a global alpha value,

●

Color Space Conversion matrix (YCbCr 601 to RGB).

4.4.3

Cursor Plane

The curser plane is defined as a 128 x 128 pixel area stored in an external memory chip. Each

cursor entry is an ARGB4444 pixel. The alpha factor of 4-bits is for antialiasing the cursor pattern on

top of the composited output picture.

List of features :

●

ACLUT8 format with ARGB4444 CLUT entries,

●

Size is programmable up to 128 x 128.

●

Hardware rectangular clipping window, out of which the cursor is never displayed (per-pixel

clipping, so only part of the cursor can be out of this window, and consequently transparent).

●

Current bitmap is specified using a pointer register to an external memory location, making

cursor animation very easy.

●

Programmable pitch, so that all cursor patterns can be stored in a single global bitmap.

4.4.4

Graphics Plane

List of features :

●

On-Screen Display and Graphics data arrives in ARGB 8:10:10:10 format,

●

Gain and offset adjustment.

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