ADV7342 datasheet(54/88 Pages) AD

54 / 88 page

ADV7342/ADV7343

Rev. 0 | Page 54 of 88

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

the following equations:

= GY × Y + RV × Pr

= GY × Y − (GU × Pb) − (GV × Pr)

= GY × Y + BU × Pb

Note that subtractions are implemented in hardware.

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

= GY × Y

= RV × Pr

= BU × Pb

where:

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

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

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

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

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

Upon power-up, the CSC matrix is programmed with the

default values shown in Table 44.

Table 44. 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 components are converted according to the following

1080i and 720p standards (SMPTE 274M, SMPTE 296M):

= Y + 1.575Pr

= Y − 0.468Pr − 0.187Pb

= 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 could use different scale values.

For example, SMPTE 293M uses the following conversion:

= Y + 1.402Pr

= Y – 0.714Pr – 0.344Pb

= 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:

Enable the ED/HD manual CSC matrix adjust feature

(Subaddress 0x02, Bit 3).

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

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

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 CONTROL

Subaddress 0x9C to Subaddress 0x9F

SD Y Scale, SD Cb Scale, and SD Cr Scale are three 10-bit

control registers that scale the SD Y, Cb, and Cr output levels.

Each of these registers represents the value required to scale the

Cb or Cr level from 0.0 to 2.0 times its initial value and the Y

level from 0.0 to 1.5 times its initial level. The value of these 10

bits is 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

Note that this feature affects all interlaced output signals, that is,

CVBS, Y/C, YPrPb, and RGB.

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