ADV7321 datasheet(49/88 Pages) AD

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ADV7320/ADV7321

Rev. 0 | Page 49 of 88

PS/HD Sinc Filter

[Subaddress 0x13, Bit 3]

FREQUENCY (MHz)

0.5

–0.5

0.4

0.1

–0.2

–0.3

–0.4

0.3

0.2

–0.1

Figure 67. HD Sinc Filter Enabled

FREQUENCY (MHz)

0.5

–0.5

0.4

0.1

–0.2

–0.3

–0.4

0.3

0.2

–0.1

Figure 68. HD Sinc Filter Disabled

COLOR CONTROLS AND RGB MATRIX

HD Y Level, HD Cr Level, HD Cb Level

[Subaddresses 0x16 to 0x18]

Three 8-bit registers at Addresses 0x16, 0x17, and 0x18 are used

to program the output color of the internal HD test pattern

generator, be it the lines of the cross hatch pattern or the

uniform field test pattern. They are not functional as color

controls for external pixel data input. For this purpose the RGB

matrix is used.

The values for Y and the color difference signals used to obtain

white, black, and saturated primary and complementary colors

conform to the ITU-R BT.601-4 standard.

Table 29 shows sample color values that can be programmed

into the color registers when the output standard selection is

set to EIA 770.2.

Table 29. Sample Color Values for EIA 770.2

Output Standard Selection

Sample Color

Y Value

Cr Value

Cb 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)

RGB Matrix

[Subaddresses 0x03 to 0x09]

The internal RGB matrix automatically performs all YCrCb to

RGB scaling according to the input standard programmed in

the device as selected by input mode Register 0x01 [6:4]. Table 30

shows the options available in this Matrix.

Note that it is not possible to do a color space conversion from

RGB-in to YPrPb-out. Also, it is not possible to input SD RGB.

Table 30. Matrix Conversion Options

HDTV/SD/PS

Input

Output

Reg 0x02,Bit 5

(YUV/RGB OUT)

Reg 0x15, Bit 1

(RGB IN/YCrCb IN,

PS/HD Only)

YCrCb

YPrPb

YCrCb

RGB

Manual RGB Matrix Adjust Feature

Normally, there is no need to enable this feature in Register 0x02,

Bit 3, because the RGB matrix automatically performs color

space conversion depending on the input mode chosen (SD/PS,

HD) and the polarity of RGB/YPrPb output in Register 0x02,

Bit 5 (see Table 30). For this reason, the manual RGB matrix

adjust feature is disabled by default. However, For HDTV

YCrCb-to-RGB conversion, the RGB matrix must be enabled to

invoke the correct coefficients for this color space. The

coefficients do not need to be adjusted.

The manual RGB matrix adjust feature provides custom

coefficient manipulation and is used in progressive scan and

high definition modes only.

When the manual RGB matrix adjust feature is enabled, the

default values in Registers 0x05 to 0x09 are correct for HDTV

color space only. The color components are converted

according to the 1080i and 720p standards (SMPTE 274M,

SMPTE 296M):

ADV7321 Datasheet(PDF) 49 Page - Analog Devices

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