STV3550 datasheet(45/144 Pages) STMICROELECTRONICS

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Graphics Functional Description

STV3550

45/144

This can be used to independently control the contrast of the OSD plane in relation to the Video

display plane.

Table 11: OSD Header Characteristics

Bitfield

Bits

Description

PNDL[11:0]

The Number of Pixels displayed per TV line.

000h:

FFFh:

Gain[5:0]

Gain Factor applied to RGB outputs.

00h: 0/32 Gain factor

3Fh: 63/32 Gain factor

GaEn

Gain Enable

0: Gain and offset operations are disabled.

1: Gain and offset operations are enabled.

MiMo[1:0]

Mixing Mode

00: Pixel Mixing mode

01: Global Mixing mode

10: Proportional Mixing mode

11: No Mixing mode (full OSD)

FM[1:0]

Filter Mode

00: No Filter mode

01: Anti-Flicker mode

10: Anti-Flutter mode

11: Reserved

SLL

Stop Linked List

0: The next OSD specification will be displayed.

1: The current OSD specification is the last one displayed on the TV screen. After this

specification is displayed, the OSD will switch off.

New Palette

0: The CLUT from the previous OSD region will be used.

1: A new palette must be loaded for the current OSD region.

Offset[9:0]

Offset value added to RGB outputs.

000h:

3FFh:

CLUTAdd[7:0]

Address in the OSD CLUT where the first color (pointed by Palettep[31:0]) will be (re) loaded.

00h:

FFh:

NCL[7:0]

Number of Colors Loaded in the OSD CLUT

00h:

FFh:

MiW[7:0]

Mixing factor applied to RGB outputs when Global mixing mode is selected.

Values greater than 80h are clamped to 80h.

00h:

80h:

MiGa[8:0]

Mixing factor which multiply or divide the Alpha parameter when Proportional mixing mode is

selected.

000h:

1FFh:

TPND[21:0]

Total Number of Pixels Displayed.

000000h:

3FFFFFh:

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