TMC2192 datasheet(28/69 Pages) CADEKA

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TMC2192

PRODUCT SPECIFICATION

REV. 1.0.0 8/13/03

Layering Engine

Control Registers for this section

The TMC2192 features a robust layering engine with three

possible input layers controlled by two keying controls. The

layer assignments are shown in Table 22, along with the key-

ing control. The keying controls, KEY pin or OL4-0 are

aligned with the incoming pixel data stream and are then

delayed throughout the chip to be continuously aligned with

the input video streams. A generic overview of the keying

and layering features is shown in Figure 21.

Figure 20. Layering Engine

Overlay Mixer

The OL[4:0] bus provides the ability to overlay 30 different

24 bit values onto the pixel data path. The 24 bit overlay col-

ors must be the same format as the incoming Pixel data. For

Y,Cb,Cr input formats the range of Y values spans the entire

range of the format, 1 to 254, this enables super whites and

super blacks in the overlay palette.

When OL[4:0] is equal to 00h the pixel data port to be the

output of the overlay mixer. If OL[4:0] is in the range of 1 to

31 then the output source is one of 30 possible overlay col-

ors, see Table 22. Overlay Address Map. When OL4-0 equal

to 16, the overlay mixer produces a pixel data output with

half the luminance magnitude and chrominance magnitude.

Any OL4-0 value greater than 16 will result in a overlay mix

with a full amplitude overlay and the pixel data with half

amplitude pixel data (PD) or half amplitude CVBS data as its

values. This allows for transparent overlays or produce

shadow boxes around overlaid text.

The midpoint of the rising and falling edges on the mixed

output is determined by the transition of the OL[4:0] pins in

Address

Bit(s)

Name

0x04

SKEN

0x05

3-2

OMIX

0x07

SKFLIP

0x09

HKEN

0x09

BUKEN

0x09

SKEXT

0x09

DKDIS

0x09

EKDIS

0x09

FKDIS

0x09

1-0

LAYMODE

0x0A

7-0

DKEYMAX

0x0B

7-0

DKEYMIN

0x0C

7-0

EKEYMAX

0x0D

7-0

EKEYMIN

0x0E

7-0

FKEYMAX

0x0F

7-0

FKEYMIN

Address

Bit(s)

Name

Table 18. Layering and Keying Modes

LAYMODE

BACKGROUND

MIDGROUND

FOREGROUND

Image Source

Keying Control

Image Source

Keying Control

OVERLAY

OL4-0

CVBS

KEY or Data Key

CVBS

KEY or Data Key

OVERLAY

OL4-0

CVBS

OVERLAY

OL4-0

KEY or Data Key

CVBS

KEY or Data Key

OVERLAY

OL4-0

DATA KEY

KEY

OVERLAY

MIXER

OLUT

OL4-0

KEYING

MIXER

CVBS

COMP

LOGIC

1/2AMP

65-6294-23

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