ADV7189KST View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADV7189KST

Multiformat SDTV Video Decoder

Analog Devices

ADV7189KST Datasheet PDF : 104 Pages

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ADV7189

SDP AV CODE INSERTION AND CONTROLS

This section describes the I2C based controls that affect

• Insertion of AV codes into the data stream

• Data blanking during the vertical blank interval (VBI)

• The range of data values permitted in the output data

stream

• The relative delay of luma versus chroma signals

Please note that some of the decoded VBI data is being inserted

during the horizontal blanking interval. See the Gemstar Data

Recovery section for more information.

BT656-4 ITU Standard BT-R.656-4 Enable (SDP),

Address 0x04, [7]

The ITU has changed the position for toggling of the V bit

within the SAV EAV codes for NTSC between revisions 3 and 4.

The BT656-4 standard bit allows the user to select an output

mode that is compliant with either the previous or the new

standard. For further information please review the standard at

http://www.itu.int.

Please note that the standard change affects NTSC only and has

no bearing on PAL.

Table 90. BT656-4 Function

BT656-4 Description

BT656-3 Spec: V bit goes low at EAV of lines 10

and 273.

BT656-4 Spec: V bit goes low at EAV of lines 20

and 283.

*Default value.

SD_DUP_AV SDP Duplicate AV codes (SDP),

Address 0x03, [0]

Depending on the output interface width, it may be necessary to

duplicate the AV codes from the luma path into the chroma

path.

In an 8-/10-bit-wide output interface (Cb/Y/Cr/Y interleaved

data), the AV codes are defined as FF/00/00/AV, with AV being

the transmitted word that contains information about H/V/F.

In this output interface mode, the following assignment takes

place: Cb = FF, Y = 00, Cr = 00, and Y = AV.

In a 16-/20-bit output interface where Y and Cr/Cb are

delivered via separate data buses, the AV code is over the whole

20 bits. The SD_DUP_AV bit allows the user to double up the

AV codes, so the full sequence can be found on the Y bus as well

as (= duplicated) the Cr/Cb bus. See Figure 19.

Table 91. SD_DUP_AV Function

SD_DUP_AV Description

AV codes in single fashion (to suit 8-/10-bit

interleaved data output).

AV codes duplicated (for 16-/20-bit interfaces).

*Default value.

VBI_EN Vertical Blanking Interval Data Enable (SDP),

Address 0x03, [7]

The VBI enable bit allows data such as intercast and closed

caption data to be passed through the luma channel of the SDP

decoder with only a minimal amount of filtering. All data for

lines 1 to 21 is passed through and available at the output port.

The ADV7189 does not blank the luma data, and automatically

switches all filters along the luma data path into their widest

bandwidth. For active video, the filter settings for YSH and YPK

are restored.

Refer to the BL_C_VBI Blank Chroma during VBI section for

information on the chroma path.

Table 92.

VBI_EN

*Default value.

Description

All video lines are filtered/scaled.

Only active video region is filtered/scaled.

Y DATA BUS

Cr/Cb DATA BUS

SD_DUP_AV = 1

16-/20-BIT INTERFACE

AV CODE SECTION

Figure 19. SDP AV Code Duplication Control

SD_DUP_AV = 0

8-/10-BIT INTERFACE

Cb/Y/Cr/Y

INTERLEAVED

FF 00 00 AV Cb

AV CODE SECTION

Rev. A | Page 40 of 104

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