ADV7341_15 datasheet(59/108 Pages) AD

59 / 108 page

Data Sheet

ADV7340/ADV7341

Rev. C | Page 59 of 108

Table 45 shows sample color values that can be programmed

into the color registers when the output standard selection is set

to EIA 770.2/EIA770.3 (Subaddress 0x30, Bits[1:0] = 00).

Table 45. Sample Color Values for EIA 770.2/EIA770.3

ED/HD Output Standard Selection

Sample Color

Y Value

Cr Value

Cb Value

White

235

(0xEB)

128

(0x80)

128

(0x80)

Black

(0x10)

128

(0x80)

128

(0x80)

Red

(0x51)

240

(0xF0)

(0x5A)

Green

145

(0x91)

(0x22)

(0x36)

Blue

(0x29)

110

(0x6E)

240

(0xF0)

Yellow

210

(0xD2)

146

(0x92)

(0x10)

Cyan

170

(0xAA)

(0x10)

166

(0xA6)

Magenta

106

(0x6A)

222

(0xDE)

202

(0xCA)

COLOR SPACE CONVERSION MATRIX

Subaddress 0x03 to Subaddress 0x09

The internal color space conversion (CSC) matrix automatically

performs all color space conversions based on the input mode

programmed in the mode select register (Subaddress 0x01,

Bits[6:4]). Table 46 and Table 47 show the options available in

this matrix.

An SD color space conversion from RGB-in to YPrPb-out is

possible. An ED/HD color space conversion from RGB-in to

YPrPb-out is not possible.

Table 46. SD Color Space Conversion Options

Input

Output1

YPrPb/RGB Out

(Subaddress 0x02,

Bit 5)

RGB In/YCrCb In

(Subaddress 0x87,

Bit 7)

YCrCb

YPrPb

YCrCb

RGB

YPrPb

RGB

CVBS/YC outputs are available for all CSC combinations.

Table 47. ED/HD Color Space Conversion Options

Input

Output

YPrPb/RGB Out

(Subaddress 0x02,

Bit 5)

RGB In/YCrCb In

(Subaddress 0x35,

Bit 1)

YCrCb

YPrPb

YCrCb

RGB

SD Manual CSC Matrix Adjust Feature

The SD manual CSC matrix adjust feature provides custom

coefficient manipulation for RGB to YPbPr conversion (for

YPbPr to RGB conversion, this matrix adjustment is not

available).

Normally, there is no need to modify the SD matrix coefficients

because the CSC matrix automatically performs the color space

conversion based on the output color space selected (see Table 46).

Note that Bit 7 in Subaddress 0x87 must be set to enable RGB

input and, therefore, use the CSC manual adjustment.

The SD CSC matrix scalar uses the following equations:

Y = (a1 × R) + (a2 × G) + (a3 × B) + a4

Pr = (b1 × R) + (b2 × G) + (b3 × B) + b4

Pb = (c1 × R) + (c2 × G) + (c3 × B) + c4

The coefficients and their default values and register locations

are shown in Table 48.

Table 48. SD Manual CSC Matrix Default Values

Coefficient

Subaddress

Default

0xBD

0x42

0xBE

0x81

0xBF

0x19

0xC0

0x10

0xC1

0x70

0xC2

0x5E

0xC3

0x12

0xC4

0x80

0xC5

0x26

0xC6

0x4A

0xC7

0x70

0xC8

0x80

ED/HD Manual CSC Matrix Adjust Feature

The ED/HD manual CSC matrix adjust feature provides custom

coefficient manipulation for color space conversions and is used

in ED and HD modes only. The ED/HD manual CSC matrix

adjust feature can be enabled using Subaddress 0x02, Bit 3.

Normally, there is no need to enable this feature because the CSC

matrix automatically performs the color space conversion based

on the input mode chosen (ED or HD) and the input and output

color spaces selected (see Table 47). For this reason, the ED/HD

manual CSC matrix adjust feature is disabled by default.

If RGB output is selected, the ED/HD CSC matrix scalar uses

the following equations:

R = GY × Y + RV × Pr

G = GY × Y − (GU × Pb) − (GV × Pr)

B = GY × Y + BU × Pb

Note that subtractions are implemented in hardware.

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

Y = GY × Y

Pr = RV × Pr

Pb = BU × Pb

where:

GY = Subaddress 0x05, Bits[7:0] and Subaddress 0x03, Bits[1:0].

GU = Subaddress 0x06, Bits[7:0] and Subaddress 0x04, Bits[7:6].

GV = Subaddress 0x07, Bits[7:0] and Subaddress 0x04, Bits[5:4].

BU = Subaddress 0x08, Bits[7:0] and Subaddress 0x04, Bits[3:2].

RV = Subaddress 0x09, Bits[7:0] and Subaddress 0x04, Bits[1:0].

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