ADV7180WBSTZ datasheet(29/120 Pages) AD

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Data Sheet

ADV7180

Rev. G | Page 29 of 120

SD_OFF_Cb[7:0], SD Offset Cb Channel, Address 0xE1[7:0]

This register allows the user to select an offset for the Cb channel

only and to adjust the hue of the picture. There is a functional

overlap with the HUE[7:0] register.

Table 30. SD_OFF_Cb Function

SD_OFF_Cb[7:0]

Description

0x80 (default)

0 mV offset applied to the Cb channel

0x00

−312 mV offset applied to the Cb channel

0xFF

+312 mV offset applied to the Cb channel

SD_OFF_Cr[7:0], SD Offset Cr Channel, Address 0xE2[7:0]

This register allows the user to select an offset for the Cr channel

only and to adjust the hue of the picture. There is a functional

overlap with the HUE[7:0] register.

Table 31. SD_OFF_Cr Function

SD_OFF_Cr[7:0]

Description

0x80 (default)

0 mV offset applied to the Cr channel

0x00

−312 mV offset applied to the Cr channel

0xFF

+312 mV offset applied to the Cr channel

BRI[7:0], Brightness Adjust, Address 0x0A[7:0]

This register controls the brightness of the video signal. It allows

the user to adjust the brightness of the picture.

Table 32. BRI Function

BRI[7:0]

Description

0x00 (default)

Offset of the luma channel = 0 IRE

0x7F

Offset of the luma channel = +30 IRE

0x80

Offset of the luma channel = −30 IRE

HUE[7:0], Hue Adjust, Address 0x0B[7:0]

This register contains the value for the color hue adjustment. It

allows the user to adjust the hue of the picture.

HUE[7:0] has a range of ±90°, with 0x00 equivalent to an

adjustment of 0°. The resolution of HUE[7:0] is 1 bit = 0.7°.

The hue adjustment value is fed into the AM color demodulation

block. Therefore, it applies only to video signals that contain

chroma information in the form of an AM-modulated carrier

(CVBS or Y/C in PAL or NTSC). It does not affect SECAM

and does not work on component video inputs (YPrPb).

Table 33. HUE Function

HUE[7:0]

Description (Adjust Hue of the Picture)

0x00 (default)

Phase of the chroma signal = 0°

0x7F

Phase of the chroma signal = −90°

0x80

Phase of the chroma signal = +90°

DEF_Y[5:0], Default Value Y, Address 0x0C[7:2]

When the ADV7180 loses lock on the incoming video signal or

when there is no input signal, the DEF_Y[5:0] register allows

the user to specify a default luma value to be output. This value

is used under the following conditions:

•

If the DEF_VAL_AUTO_EN bit is set to high and the

ADV7180 has lost lock to the input video signal. This is

the intended mode of operation (automatic mode).

•

The DEF_VAL_EN bit is set, regardless of the lock status of

the video decoder. This is a forced mode that may be useful

during configuration.

The DEF_Y[5:0] values define the six MSBs of the output video.

The remaining LSBs are padded with 0s. For example, in 8-bit

mode, the output is Y[7:0] = {DEF_Y[5:0], 0, 0}.

For DEF_Y[5:0], 0x0D (blue) is the default value for Y.

DEF_C[7:0], Default Value C, Address 0x0D[7:0]

The DEF_C[7:0] register complements the DEF_Y[5:0] value. It

defines the four MSBs of Cr and Cb values to be output if

•

The DEF_VAL_AUTO_EN bit is set to high and the

ADV7180 cannot lock to the input video (automatic mode).

•

DEF_VAL_EN bit is set to high (forced output).

The data that is finally output from the ADV7180 for the

chroma side is Cr[3:0] = {DEF_C[7:4], 0, 0, 0, 0}, and

Cb[3:0] = {DEF_C[3:0], 0, 0, 0, 0}.

For DEF_C[7:0], 0x7C (blue) is the default value for Cr and Cb.

DEF_VAL_EN, Default Value Enable, Address 0x0C[0]

This bit forces the use of the default values for Y, Cr, and Cb. See

the descriptions in the DEF_Y[5:0], Default Value Y, Address

0x0C[7:2] and DEF_C[7:0], Default Value C, Address 0x0D[7:0]

sections for additional information. In this mode, the decoder

also outputs a stable 27 MHz clock, HS, and VS.

Setting DEF_VAL_EN to 0 (default) outputs a colored screen

determined by user-programmable Y, Cr, and Cb values when

the decoder free-runs. Free-run mode is turned on and off by

the DEF_VAL_AUTO_EN bit.

Setting DEF_VAL_EN to 1 forces a colored screen output

determined by user-programmable Y, Cr, and Cb values.

This overrides picture data even if the decoder is locked.

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