ADV7183AKST Analog Devices Inc, ADV7183AKST Datasheet - Page 55

• Manufacturer Part Number: ADV7183AKST
• Description: IC VIDEO DECODER NTSC 80-LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7183AKST

• Applications: Projectors, Recorders, Security
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

•
The recovered data is not available through I
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 Tele-
communications Union, ITU-R BT.1364. See Figure 35. For
more information, see the ITU website at www.itu.ch
The format of the data packet depends on the following criteria:
•
•
•
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. See Figure 35 and Table 150, which show the
overall structure of the data packet.
Table 150. Generic Data Output Packet
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GDECAD configures the way in which data is embedded
in the video data stream.
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,
Address 0x4C [0] bit).
Data is Closed Caption (CCAP) or Gemstar-compatible.
D[9]
0
1
1
0
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!EP
!CS[8]
PREAMBLE FOR ANCILLARY DATA
00
D[8]
0
1
1
1
EP
EP
EP
EP
EP
EP
EP
EP
EP
EP
CS[8]
DATA IDENTIFICATION
FF
0
1
1
0
0
0
0
0
0
0
0
CS[7]
D[7]
0
EF
0
FF
DID
D[6]
0
1
1
1
2X
0
0
0
0
0
0
0
0
0
CS[6]
Figure 35. Gemstar and CCAP Embedded Data Packet (Generic)
2
C, but is being
SDID
SECONDARY DATA IDENTIFICATION
COUNT
D[5]
0
1
1
0
0
CS[5]
DATA
Rev. B | Page 55 of 104
USER DATA (4 OR 8 WORDS)
D[4]
0
1
1
0
0
CS[4]
word1[7:4]
word1[3:0]
word2[7:4]
word2[3:0]
word3[7:4]
word3[3:0]
word4[7:4]
word4[3:0]
USER DATA
line[3:0]
Entries within the packet are as follows:
•
•
•
•
•
•
•
Table 150 lists the values within a generic data packet that is
output by the ADV7183A in 8-bit format. In 8-bit systems,
Bits D1 and D0 in the data packets are disregarded.
0
1
1
0
CS[3]
D[3]
DC[1]
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.
(Requirement as set in ITU-R BT.1364.)
Checksum byte.
D[2]
0
1
1
0
DC[0]
CS[2]
OPTIONAL PADDING
D[1]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
BYTES
D[0]
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
CHECK
SUM
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
ADV7183A