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| 型號： | EVAL-ADV7189EBM |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat SDTV Video Decoder |
| 中文描述： | 標清多格式視頻解碼器 |
| 文件頁數(shù)： | 40/104頁 |
| 文件大?。?/td> | 890K |
| 代理商： | EVAL-ADV7189EBM |
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ADV7189
SDP AV CODE INSERTION AND CONTROLS
This section describes the I
2
C based controls that affect
Rev. A | Page 40 of 104
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
0*
BT656-3 Spec: V bit goes low at EAV of lines 10
and 273.
1
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
0
AV codes in single fashion (to suit 8-/10-bit
interleaved data output).
1
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
Description
0*
All video lines are filtered/scaled.
1
Only active video region is filtered/scaled.
*Default value.
0
Y DATA BUS
00
AV
Y
FF
00
00
AV
Y
FF
Cr/Cb DATA BUS
00
00
AV
Cb
FF
00
Cb
AV CODE SECTION
AV CODE SECTION
FF
00
00
AV
Cb
AV CODE SECTION
Cb/Y/Cr/Y
INTERLEAVED
8-/10-BIT INTERFACE
16-/20-BIT INTERFACE
16-/20-BIT INTERFACE
SD_DUP_AV = 1
SD_DUP_AV = 0
Figure 19. SDP AV Code Duplication Control
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