ADV7341_15 datasheet(60/108 Pages) AD

60 / 108 page

ADV7340/ADV7341

Data Sheet

Rev. C | Page 60 of 108

On power-up, the CSC matrix is programmed with the default

values shown in Table 49.

Table 49. ED/HD Manual CSC Matrix Default Values

Subaddress

Default

0x03

0x04

0xF0

0x05

0x4E

0x06

0x0E

0x07

0x24

0x08

0x92

0x09

0x7C

When the ED/HD manual CSC matrix adjust feature is enabled,

the default coefficient values in Subaddress 0x03 to Subaddress

0x09 are correct for the HD color space only. The color com-

ponents are converted according to the following 1080i and

720p standards (SMPTE 274M, SMPTE 296M):

R = Y + 1.575Pr

G = Y − 0.468Pr − 0.187Pb

B = Y + 1.855Pb

The conversion coefficients should be multiplied by 315 before

being written to the ED/HD CSC matrix registers. This is

reflected in the default values for GY = 0x13B, GU = 0x03B,

GV = 0x093, BU = 0x248, and RV = 0x1F0.

If the ED/HD manual CSC matrix adjust feature is enabled and

another input standard (such as ED) is used, the scale values for

GY, GU, GV, BU, and RV must be adjusted according to this

input standard color space. The user should consider that the

color component conversion may use different scale values.

For example, SMPTE 293M uses the following conversion:

R = Y + 1.402Pr

G = Y – 0.714Pr – 0.344Pb

B = Y + 1.773Pb

The programmable CSC matrix is used for external ED/HD

pixel data and is not functional when internal test patterns are

enabled.

Programming the CSC Matrix

If custom manipulation of the ED/HD CSC matrix coefficients

is required for a YCrCb-to-RGB color space conversion, use the

following procedure:

1. Enable the ED/HD manual CSC matrix adjust feature

(Subaddress 0x02, Bit 3).

2. Set the output to RGB (Subaddress 0x02, Bit 5).

3. Disable sync on PrPb (Subaddress 0x35, Bit 2).

4. Enable sync on RGB (optional) (Subaddress 0x02, Bit 4).

The GY value controls the green signal output level, the BU

value controls the blue signal output level, and the RV value

controls the red signal output level.

SD LUMA AND COLOR SCALE CONTROL

Subaddress 0x9C to Subaddress 0x9F

When enabled, the SD luma and color scale control feature can

be used to scale the SD Y, Cb, and Cr output levels. This feature

can be enabled using Subaddress 0x87, Bit 0. This feature affects

all SD output signals, that is, CVBS, Y-C, YPrPb, and RGB.

When enabled, three 10-bit registers (SD Y scale, SD Cb scale,

and SD Cr scale) control the scaling of the SD Y, Cb, and Cr

output levels. The SD Y scale register contains the scaling factor

used to the scale the Y level from 0.0 to 1.5 times its initial level.

The SD Cb scale and SD Cr scale registers contain the scaling

factors to scale the Cb and Cr levels from 0.0 to 2.0 times their

initial levels, respectively.

The values to be written to these 10-bit registers are calculated

using the following equation:

Y, Cb, or Cr Scale Value = Scale Factor × 512

For example, if Scale Factor = 1.3

Y, Cb, or Cr Scale Value = 1.3 × 512 = 665.6

Y, Cb, or Cr Scale Value = 666 (rounded to the nearest integer)

Y, Cb, or Cr Scale Value = 1010 0110 10b

Subaddress 0x9C, SD scale LSB register = 0x2A

Subaddress 0x9D, SD Y scale register = 0xA6

Subaddress 0x9E, SD Cb scale register = 0xA6

Subaddress 0x9F, SD Cr scale register = 0xA6

It is recommended that the SD luma scale saturation feature

(Subaddress 0x87, Bit 1) be enabled when scaling the Y output

level to avoid excessive Y output levels.

SD HUE ADJUST CONTROL

Subaddress 0xA0

When enabled, the SD hue adjust control register (Subaddress

0xA0) is used to adjust the hue on the SD composite and chroma

outputs. This feature can be enabled using Subaddress 0x87, Bit 2.

Subaddress 0xA0 contains the bits required to vary the hue of

the video data, that is, the variance in phase of the subcarrier

during active video with respect to the phase of the subcarrier

during the color burst. The ADV7340/ADV7341 provide a

range of ±22.5° in increments of 0.17578125°. For normal

operation (zero adjustment), this register is set to 0x80. Value

0xFF and Value 0x00 represent the upper and lower limits,

respectively, of the attainable adjustment in NTSC mode. Value

0xFF and Value 0x01 represent the upper and lower limits,

respectively, of the attainable adjustment in PAL mode.

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