TMC2193 datasheet(9/72 Pages) CADEKA

9 / 72 page

PRODUCT SPECIFICATION

TMC2193

REV. 1.0 3/26/03

Gamma Correction

Control Registers for this section

Inherent in all CRT displays is a non-linearity between the

voltage applied to the electron guns and the CRT phosphor

brightness. Traditionally this non-linearity, gamma, is com-

pensated at the camera. However, many sources today are

mixed in the digital domain and do not contain any gamma

correction.

For this reason the TMC2193 contains optional gamma cor-

rection process. The TMC2193 contains two independent

gamma circuits, one for the Green data path and the other for

the Blue and Red data path. Each gamma processor has two

(2) gamma compensation curves, one for NTSC and one for

PAL, that can be applied to the incoming video data.

The formulas for the gamma curves are:

PAL:

Y = X1/2.8

for 0

≤ X ≤ 255

NTSC: Y = 4.5 * X

for 0

≤ X ≤ 6

Y = 1.099 * X1/2.22 – 0.099

for 7

≤ X ≤ 255

Figure 7. Gamma Curves

Color Space Matrix

Control Registers for this section

The color space matrix (CSM) has four modes of operation,

which are controlled by CSMFMT. The CSMFMT bits con-

ﬁgures the color space matrix to produce the desired outputs

from the input source. The inputs for the CSM can be either

RGB or YCBCR. In all four modes YUV for the composite

generation will always be one set of component outputs of

the CSM. The other set of components outputs can be either

RGB or YPBPR.

•

CSMFMT = 00 , YCBCR input source with YUV and

YPBPR outputs.

Matrix conﬁguration:

Ycomposite

= MCF1 * Yin

= MCF4 * CB

= MCF6 * CR

Ycomponent

= MCF8 * Yin

= MCF9 * CB

= MCF10 * CR

Address

Bit(s)

Name

0x04

GAMENG

0x04

GAMENC

0x04

GAMSELG

0x04

GAMSELC

128

256

384

512

640

768

896

1024

128

160

192

224

256

RGB Inputs (0 to 255)

PAL Gamma Curve

NTSC Gamma Curve

Address

Bit(s)

Name

0x30

7-0

MCF1L

0x31

7-0

MCF2L

0x32

7-0

MCF3L

0x33

7-0

MCF4L

0x34

7-0

MCF5L

0x35

7-0

MCF6L

0x36

7-0

MCF7L

0x37

7-0

MCF8L

0x38

7-0

MCF9L

0x39

7-0

MCF10L

0x3A

7-4

MCF1M

0x3A

3-0

MCF2M

0x3B

7-4

MCF3M

0x3B

2-0

MCF4M

0x3C

7-4

MCF5M

0x3C

2-0

MCF6M

0x3D

7-4

MCF7M

0x3D

3-0

MCF8M

0x3E

7-4

MCF9M

0x3E

3-0

MCF10M

0x3F

NMEH

0x3F

1-0

CSMFMT

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