參數(shù)資料
型號(hào)： ADV7184
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述： 標(biāo)清多格式視頻解碼器支持快速開關(guān)重疊
文件頁數(shù)： 48/108頁
文件大小： 925K
代理商： ADV7184
ADV7184
PFTOGSIGN PAL Field Toggle Sign, Address 0xEA [5]
0—Delays the field transition. Set for user manual
programming.
1 (default)—Advances the field transition. Not recommended
for user programming.
Rev. 0 | Page 48 of 108
PFTOG PAL Field Toggle, Address 0xEA [4:0]
The default value of PFTOG is 00011, indicating the PAL field
toggle position.
For all NTSC/PAL field timing controls, the F bit in the AV
code and the field signal on the FIELD/DE pin are modified.
0
ADVANCE TOGGLE OF
FIELD BY PTOG[4:0]
DELAY TOGGLE OF
FIELD BY PFTOG[4:0]
PFTOGSIGN
ODD FIELD
0
1
NO
YES
PFTOGDELE
ADDITIONAL
DELAY BY
1 LINE
1
0
PFTOGDELO
ADDITIONAL
DELAY BY
1 LINE
1
0
FIELD
TOGGLE
NOT VALID FOR USER
PROGRAMMING
Figure 36. PAL F Toggle
SYNC PROCESSING
The ADV7184 has two additional sync processing blocks that
postprocess the raw synchronization information extracted
from the digitized input video. If desired, the blocks can be
disabled via the following two I
2
C bits.
ENHSPLL Enable HSYNC Processor, Address 0x01 [6]
The HSYNC processor is designed to filter incoming HSYNCs
that have been corrupted by noise, providing improved per-
formance for video signals with stable time bases but poor SNR.
0—Disables the HSYNC processor.
1 (default)—Enables the HSYNC processor.
ENVSPROC Enable VSYNC Processor, Address 0x01 [3]
This block provides extra filtering of the detected VSYNCs to
give improved vertical lock.
0—Disables the VSYNC processor.
1 (default)—Enables the VSYNC processor.
VBI DATA DECODE
There are two VBI data slicers on the ADV7184. The first is
called is called the VBI data processor (VDP) and the second is
called VBI System 2.
The VDP can slice both low bandwidth standards and high
bandwidth standards such as teletext. VBI System 2 can slice
low data-rate VBI standards only.
The VDP is capable of slicing multiple VBI data standards on
SD video. It decodes the VBI data on the incoming CVBS/YC or
YUV data. The decoded results are available as ancillary data in
output 656 data stream. For low data rate VBI standards like
CC/WSS/CGMS the user can read the decoded data bytes from
I
2
C registers.
The VBI data standards that can be decoded by the VDP are:
PAL
Teletext System A or C or D
Teletext System B/WST
VPS (Video Programming System)
VITC (Vertical Interval Time Codes)
WSS (Wide Screen Signaling)
ITU-BT-653
ITU-BT-653
ETSI EN 300 231 V 1.3.1
BT.1119-1/
ETSI.EN.300294
CCAP (Closed Captioning)
NTSC
Teletext System B and D
Teletext System C/NABTS
VITC (Vertical Interval Time Codes)
CGMS (Copy Generation Management
System)
GEMSTAR
CCAP (Closed Captioning)
ITU-BT-653
ITU-BT-653/EIA-516
EIA-J CPR-1204/IEC
61880
EIA-608
The VBI data standard that the VDP decodes on a particular
line of incoming video has been set by default as described in
Table 64. This can be overridden manually and any VBI data
can be decoded on any line. The details of manual program-
ming are described in Table 65 and Table 66.
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