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STK6005

To set a Multi-Color Font

Set a register MultiChar to capture the color fonts. Each color font will occupy 4 monochrome fonts spaces.

The multi-color font will occupy the space from the font index 0. For example, when MultiChar is set to 2, there

are 2 multi-color fonts available. The monochrome fonts will start from font No. 8. The font No. 0 to 3 are

mapped to the same color font and the font NO. 4 to 7, the other color font. The color for each pixel of a color

font is also mapped to a 24-bit color through the color pallet as below.

To set registers DPH / DPV = 1 will stretch the OSD by a factor of two in the horizontal / vertical

direction respectively. Pixel and line replication is used to stretch the image. This option will also affect

the border and shadow size around the OSD window.

Blending Effect

STK6005 provides an effect of the blending OSD with image pixel and this effect is suitable for OSD

fade-in / fade-out effect. 16 levels of blending are supported. Blend level (defined by a register BlendR)

for binary codes “1111” through “0000” are in the proportion of 6.25%, 12.5%, 18.75%, .. , 93.75% and

100%. The blend percentage levels depicted here are in the percentage of OSD pixel data. For example,

0001 yields an output data stream whose blended pixel data contains 93.75% OSD and 6.25% underlying

image data. This OSD would be only slightly translucent.

External OSD interface

STK6005 also provides an external OSD interface to use an external OSD chip. OVCLK, OVHS,

OVVS ports will output the timing of panel clock, H-Sync, and V-Sync to the external OSD chip. The

output delay between OVCLK and OVHS / OVVS is tunable through register DlyOVCLK and DlyOVHS.

OSD pixels data are input from OVI, OVB, OVG, and OVR and will be combined into a 4-bit color index

then mapped to the color pallet. OVFB indicates the pixels to be displayed on the panel.

Rotational OSD

STK6005 also provides an internal logic to support the rotational OSD. When a font table for

Bit0

Bit1

Bit2

Combine to a 4-bit color font

Font 4N

Bit3

Map to Color Pallet

Font 4N+1

Font 4N+2

Font 4N+3

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