STV3550 datasheet(48/144 Pages) STMICROELECTRONICS

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STV3550

Graphics Functional Description

Two pointers, defined in the header, give the first bitmap pixel address in each field block. The

bottom field block can be merged with the top field block (line-based format).

4.1.5

Mixing OSD and Video Signals

The mixing function is used to blend each OSD pixel with the corresponding pixel generated by the

video planes behind the OSD. The mix weight is a programmable parameter and can be set for

each OSD region, or for each color. The Mixing Mode bits (MiMo[1:0]) are used to select one of four

possible mixing modes.

Figure 34: OSD CLUT Programming Flowchart

Table 13: Mixing Modes

MiMo[1:0]

Description

Pixel Mixing mode

Global Mixing mode

Header

Palette with n Colors

32 bits

Memory Space

Palettep[31:0]

... Colors

1st Color

256th Color

2nd Color

nth Color

4th Color

SDRAM

OSD CLUT

OSD

32 bits

NCL[7:0]

Clutadd[7:0]

4th Color

(NCL[7:0]+1) th Color

256th Address

First Address

n Colors

= >@ 17

In this example, the 4th color of the palette (programmed in SDRAM) is loaded at the

CLUTAdd[7:0] address in the OSD CLUT (18th address of the OSD CLUT). Therefore, the 4th

color of the palette (pointed by Palettep[31:0]) is the first color to be loaded in the OSD CLUT.

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