參數(shù)資料
型號(hào)： EVAL-ADV7189EBM
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder
中文描述： 標(biāo)清多格式視頻解碼器
文件頁(yè)數(shù)： 56/104頁(yè)
文件大?。?/td> 890K
代理商： EVAL-ADV7189EBM
ADV7189
Rev. A | Page 56 of 104
GDECAD configures the way in which data is embedded
in the video data stream.
The recovered data is not available through I
2
C, but is being
inserted into the horizontal blanking period of an ITU-R.
BT656 compatible data stream. The data format is intended to
comply with the recommendation by the International
Telecommunications Union, ITU-R BT.1364
2
. See Figure 35.
The format of the data packet depends on the following criteria:
Transmission is 1× or 2×
Data is output in 8-bit or 4-bit format (see the description
of the GDECAD Gemstar Decode Ancillary Data Format
(SDP), Address 0x4C, [0] bit)
Data is Closed Caption (CCAP) or Gemstar compatible
Data packets are output if the corresponding enable bit is set
(see the GDECEL and GDECOL descriptions), and if the
decoder detects the presence of data. This means that for video
lines where no data has been decoded, no data packet is output
even if the corresponding line enable bit is set.
Each data packet starts immediately after the EAV code of the
preceding line. Refer to Figure 35 and Table 151, which show
the overall structure of the data packet.
Entries within the packet are as follows:
Fixed preamble sequence of 0x00, 0xFF, 0xFF.
Data identification word (DID). The value for the DID
marking a Gemstar or CCAP data packet is 0x140 (10-bit
value).
Secondary data identification word (SDID), which contains
information about the video line from which data was
retrieved, whether the Gemstar transmission was of 1× or
2× format, and whether it was retrieved from an even or
odd field.
Data count byte, giving the number of user data-words that
follow.
User data section.
Optional padding to ensure that the length of the user
data-word section of a packet is a multiple of four bytes
3
.
Checksum byte.
Table 151 lists the values within a generic data packet that is
output by the ADV7189 in 10-bit format.
2
For more information, see the ITU website at www.itu.ch.
3
Requirement as set in ITU-R BT.1364.
0
00
FF
FF
DID
SDID
DATA
COUNT
USER DATA
OPTIONAL PADDING
BYTES
CHECK
SUM
SECONDARY DATA IDENTIFICATION
PREAMBLE FOR ANCILLARY DATA
DATA IDENTIFICATION
USER DATA (4 OR 8 WORDS)
Figure 35. Gemstar and CCAP Embedded Data Packet (Generic)
Table 151. Generic Data Output Packet
Byte
D[9]
0
0
1
1
2
1
3
0
4
!EP
5
!EP
6
!EP
7
!EP
8
!EP
9
!EP
10
!EP
11
!EP
12
!EP
13
!EP
14
!CS[8]
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
EP
EP
EP
EP
CS[8]
D[7]
0
1
1
0
EF
0
0
0
0
0
0
0
0
0
CS[7]
D[6]
0
1
1
1
2X
0
0
0
0
0
0
0
0
0
CS[6]
D[5]
0
1
1
0
D[4]
0
1
1
0
D[3]
0
1
1
0
D[2]
0
1
1
0
D[1]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
D[0]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count (DC)
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
User data-words
Checksum
line[3:0]
0
0
DC[1]
DC[0]
word1[7:4]
word1[3:0]
word2[7:4]
word2[3:0]
word3[7:4]
word3[3:0]
word4[7:4]
word4[3:0]
CS[4]
CS[5]
CS[3]
CS[2]
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