TMC22091KHC datasheet(3/60 Pages) CADEKA

3 / 60 page

PRODUCT SPECIFICATION

TMC22091/TMC22191

Mask Register

A Mask Register is provided which is logically ANDed with

incoming color-index data to facilitate pixel animation and

other special graphics effects. The Mask Register is ahead of

the Data Key comparators and is enabled only when color-

index input is selected. Mask Register programming and

operation are similar to that of the 171/176 family of graph-

ics RAMDACS.

Color Lookup Table

The Color Lookup Table (CLUT) is a 256 x 8 x 3 random-

access memory. It provides means for offset, gain, gamma,

and color correction in RGB and YCBCR operating modes. It

provides a full 24-bit color lookup function for color-index

mode. It can be loaded in the same manner as a standard

VGA RAMDAC.

Colorspace Conversion Matrix and

Interpolator

The matrix converts RGB data (whether from RGB inputs or

color-indexed CLUT data) into Y, B-Y, R-Y format for

encoding. In input conﬁgurations where the pixel input is

already in Y, B-Y, R-Y format, the matrix is bypassed. When

pixel data is input in YCBCR422 format, the interpolation ﬁl-

ters produce YCBCR444 for encoding.

Sync Generator

The TMC22x91 can operate in Master, Genlock, or Slave

modes. In Master and Genlock modes, the encoder internally

generates all timing and sync signals, and provides Horizon-

tal Sync, Vertical Sync, and Pixel Data Control (PDC) to the

external frame buffer circuitry. PDC is independently select-

able to function as an input or an output. In Genlock mode,

the TMC22x91 timing is controlled by the TMC22071 Gen-

locking Video Digitizer over the CVBS7-0 bus, GVSYNC,

and GHSYNC. The encoder, in turn, produces VHSYNC,

VVSYNC, and PDC for the frame buffer interface.

Figure 1a. Pixel Data Format

MSB

LSB

GBR444

MODE

24300A

RGB444

YCBCR444

YCBCR422

COLOR INDEX

GBR15

RGB15

00011000

Format Control Register

00010000

00011100

00011101

0001X011

00011010

00010010

CB/CR

Pixel

G0 B7

B0 R7

R0 G7

G0 B7

Y0 CB7

CB0RR7

RR0

CB7

CR7

CB0

CR0

MSB

LSB

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