ADV7175 datasheet(18/36 Pages) AD

18 / 36 page

ADV7175/ADV7176

REV. A

–18–

MODE REGISTER 1 MR1 (MR17–MR10)

(Address (SR4–SR0) = 01H)

Mode Register 1 is a 8-bit wide register.

Figure 32 shows the various operations under the control of Mode

MODE REGISTER 1 (MR17–MR10) BIT DESCRIPTION

Interlaced Mode Control (MR10):

This bit is used to setup the output to interlaced or non-inter-

laced mode. This mode is only relevant when the part is in

composite video mode.

Closed Captioning Field Control (MR12–MR11)

These bits control the field that close captioning data is displayed

on close captioning information can be displayed on an odd field,

even field or both fields.

DAC Control (MR16–MR13)

These bits can be used to power down the DACs. This can be

used to reduce the power consumption of the ADV7175/ADV7176

if any of the DACs are not required in the application.

Color Bar Control (MR17)

This bit can be used to generate and output an internal color

bar. The color bar configuration is 75/75/75/7.5 for NTSC and

100/0/75/0 for PAL.

MR11

MR10

MR17

MR12

MR13

MR15

MR16

MR14

CLOSED CAPTIONING

FIELD SELECTION

NO DATA OUT

ODD FIELD ONLY

EVEN FIELD ONLY

DATA OUT

(BOTH FIELDS)

MR12 MR11

COMPOSITE DAC

CONTROL

NORMAL

POWER DOWN

MR16

GREEN/LUMA

DAC CONTROL

NORMAL

POWER DOWN

MR14

RED/CHROMA

DAC CONTROL

NORMAL

POWER DOWN

MR13

BLUE/COMPOSITE

DAC CONTROL

NORMAL

POWER DOWN

MR15

INTERLACE

CONTROL

INTERLACED

NON-INTERLACED

MR10

COLOR BAR

CONTROL

DISABLE

ENABLE

MR17

Figure 32. Mode Register 1

MODE REGISTER 0 (MR07–MR00) BIT DESCRIPTION

Encode Mode Control (MR01–MR00):

These bits are used to set up the encode mode. The ADV7175/

ADV7176 can be set up to output NTSC, PAL (B, D, G, H, I),

PAL (M) and PAL (N) standard video.

Pedestal Control (MR02)

This bit specifies whether a pedestal is to be generated on the

NTSC composite video signal. This bit is invalid if the

ADV7175/ADV7176 is configured in PAL mode.

Luminance Filter Control (MR04–MR03)

These bits are used for selecting between a filter for the lumi-

nance signal. These filters automatically are set to the cutoff fre-

quency for the low-pass filters and the subcarrier frequency for

the notch filter. The extended mode filter is a 5.5 MHz low-pass

filter. The filters are illustrated in Figures 3 to 11.

RGB Sync (MR05)

This bit is used to set up the RGB outputs with the sync infor-

mation encoded.

Output Control (MR06)

This bit specifies if the part is in composite video or RGB/YUV

mode. Please note that in RGB/YUV mode the main composite

signal is still available.

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