ADV7330 datasheet(40/76 Pages) AD

40 / 76 page

REV. B

–40–

ADV7330

COLOR CONTROLS AND RGB MATRIX

HD Y Level, Cr Level, Cb Level

[Subaddress 16h–18h]

Three 8-bit wide registers at Addresses 16h, 17h, 18h are used to

program the output color of the internal HD test pattern genera-

tor, whether it is the lines of the cross hatch pattern or the uniform

field test pattern. They are not functional as color controls on

external pixel data input. For this purpose, the RGB matrix is used.

The standard used for the values for Y and the color difference

signals to obtain white, black, and the saturated primary and

complementary colors conforms to the ITU-R BT.601-4 standard.

Table VII shows sample color values to be programmed into the

color registers when output standard selection is set to EIA 770.2.

Table VII. Sample Color Values for EIA770.2 Output

Standard Selection

Sample

Color

Y Value

CR Value

CB Value

White

235 (EB)

128 (80)

Black

16 (10)

128(80)

128 (80)

Red

81 (51)

240 (F0)

90 (5A)

Green

145 (91)

34 (22)

54 (36)

Blue

41 (29)

110 (6E)

240 (F0)

Yellow

210 (D2)

146 (92)

16 (10)

Cyan

170 (AA)

16 (10)

166 (A6)

Magenta

106 (6A)

222 (DE)

202 (CA)

HD RGB Matrix

[Subaddress 03h–09h]

When the programmable RGB matrix is disabled [Address 02h,

Bit 3], the internal RGB matrix takes care of all YCrCb to YPrPb

or RGB scaling according to the input standard programmed

into the device.

When the programmable RGB matrix is enabled, the color

components are converted according to the 1080i standard

[SMPTE 274M]:

B Y

R Y

'[ . / (

)] ( '

' )

'[ . / (

)] ( '

' )

=−

−

=−

−

0 2126

0 7152

0 0722

10 0722

10 2126

This is reflected in the preprogrammed values for GY = 138Bh,

GU = 93h, GV = 3B, BU = 248h, RV = 1F0.

If another input standard is used, the scale values for GY, GU,

GV, BU, and RV have to be adjusted according to this input

standard. The user must consider that the color component con-

version might use different scale values. For example, SMPTE

293M uses the following conversion:

B Y

R Y

'[ . / (

)] ( '

' )

'[ . / (

)] ( '

' )

=−

−

=−

−

0 299

0 587

0 114

1 0 114

1 0 299

The programmable RGB matrix can be used to control the HD

output levels in cases where the video output does not confirm

to standards due to altering the DAC output stages such as

termination resistors. The programmable RGB matrix is used

for external HD data and is not functional when the HD test

pattern is enabled.

Programming the RGB Matrix

The RGB matrix should be enabled [Address 02h, Bit 3], the

output should be set to RGB [Address 02h, Bit 5], Sync on PrPb

should be disabled [Address 15h, Bit 2], and Sync on RGB is

optional [Address 02h, Bit 4].

GY at addresses 03h and 05h controls the output levels on the

green signal, BU at 04h and 08h the blue signal output levels, and

RV at 04h and 09h the red output levels. To control YPrPb output

levels, YPrPb output should be enabled [Address 02h, Bit 5].

In this case, GY [Address 05h; Address 03, Bit 0–1] is used for

the Y output, RV [Address 09h; Address 04, Bit 0–1] is used for

the Pr output, and BU [Address 08h; Address 04h, Bit 2–3] is

used for the Pb output.

If RGB output is selected, the RGB matrix scaler uses the

following equations:

GGY

BGY

RGY

=× +

If YPrPb output is selected, the following equations are used:

YGY

UBU

VRV

=×

=× Pr

On power-up, the RGB matrix is programmed with default values.

Table VIII. RGB Matrix Default Values

Address

Default

03h

04h

F0h

05h

4Eh

06h

0Eh

07h

24h

08h

92h

09h

7Ch

When the programmable RGB matrix is not enabled, the

ADV7330 automatically scales YCrCb inputs to all standards

supported by this part.

SD Luma and Color Control

[Subaddresses 5Ch, 5Dh, 5Eh, 5Fh]

SD Y SCALE, SD Cr SCALE, and SD Cb SCALE are 10-bit

wide control registers to scale the Y, U, and V output levels.

Each of these registers represents the value required to scale the

U or V level from 0.0 to 2.0, and the Y level from 0.0 to 1.5 of

its initial level. The value of these 10 bits is calculated using the

following equation:

YU or V Scalar Value

Scale Factor

=× 512

For example:

Scale factor = 1.18

Y, U, or V Scalar Value = 1.18

× 512 = 665.6

Y, U, or V Scalar Value = 665 (rounded to the nearest integer)

Y, U, or V Scalar Value = 1010 0110 01b

Address 5Ch, SD LSB Register = 15h

Address 5Dh, SD Y Scale Register = A6h

Address 5Eh, SD V Scale Register = A6h

Address 5Fh, SD U Scale Register = A6h

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