ADV7300A datasheet(42/68 Pages) AD

Part #	ADV7300A

Description	Multiformat SD, Progressive Scan/HDTV Video Encoder with Six NSV??12-Bit DACs

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REV. A

–42–

ADV7300A/ADV7301A

COLOR CONTROLS AND RGB MATRIX

HD Y Color, HD Cr Color, HD Cb Color

[Subaddresses 16h–18h]

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

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

tor, be it the lines of the crosshatch 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.BT601–

ITU-R.BT604 standards. Table XVII shows sample color

values to be programmed into the color registers when Output

Standard Selection is set to EIA 770.2.

Table XVII. Sample Color Values for EIA 770.2 Output

Standard Selection

Sample

Color Y

Color Cr

Color Cb

Color

Value

White

235 (EB)

128 (80)

Black

16 (10)

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

[Subaddresses 03h–09h]

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

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

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 SMPTE274M

standard (1080 i):

YR

G

B

Cb

B Y

RY

'.

'

.

'.

'

.

''

'

.

''

=×

()+×

()

=

−

×−

()

=

−

×−

()

0 2126

0 7152

0 0722

05

10 0722

05

10 2126

Cr

This is reflected in the preprogrammed values for GY = 13Bh,

RV = 1F0h, BU = 248h, GV = 93h, and GU = 3Bh.

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. It must be considered by the user that the color com-

ponent conversion might use different scale values. For

example, SMPTE293M uses the following conversion:

YR

G

B

Cb

B Y

RY

'.

'

.

'.

'

.

''

'

.

''

=×

()+×

()

=

−

×−

()

=

−

×−

()

0 299

0 587

0 114

05

10 114

05

10 299

Cr

The programmable RGB matrix can be used to control the HD

output levels in cases where the video output does not conform to

standards due to altering the DAC output stages, such as termi-

nation resistors, for example. The programmable RGB matrix is

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

test pattern is enabled.

To make use of the programmable RGB matrix, the YCrCb

data should contain the HSYNC signal on the Y channel only.

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

output should be set to RGB [Address 02h, Bit 3], 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 control 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, YUV output should be enabled [Address 02h,

Bit 5]. In this case, GY [Address 05h; Address 03, Bits 0–1] is

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

used for the Pr output, and BU [Address 08h; Address 04h,

Bits 2–3] is used for the Pb output.

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

lowing equations:

RGY

Y

RV

GGY

Y

GU

Cb

GV

=× +

×

=× −

×

−×

××

Cr

B= GY

Y + BU

Cb

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

RRV

GGY

Y

BBU

Cb

=×

Cr

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

Address 03h: 03h

Address 04h: F0h

Address 05h: 4Eh

Address 06h: 0Eh

Address 07h: 24h

Address 08h: 92h

Address 09h: 7Ch

When the programmable RGB matrix is not functional, the

ADV7300A/ADV7301A automatically scales YCrCb inputs to

all standards supported. For SMPTE293M, the register values

are as follows:

Address 03h: 03h

Address 04h: 1Eh

Address 05h: 4Eh

Address 06h: 1Bh

Address 07h: 38h

Address 08h: 8Bh

Address 09h: 6Eh

Address 15h, Bit 3 must be set to “1” in this mode.

SD Color Control

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

SD Y SCALE, SD Cr SCALE, and SD Cb SCALE are three

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 to 2.0 and the Y level from 0 to 1.5 of its initial

level. The value of these 10 bits is calculated using the equation:

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