ADV7181 Datasheet, PDF (54/96 Pages) Analog Devices – Multiformat SDTV Video Decoder

ADV7181B
NTSC CCAP Data
Half-byte output mode is selected by setting CDECAD = 0, the
full-byte mode is enabled by CDECAD = 1. Refer to the
GDECAD Gemstar Decode Ancillary Data Format, Address
0x4C [0] section. The data packet formats are shown in Table 68
and Table 69.
NTSC closed caption data is sliced on Line 21d on even and
odd fields. The corresponding enable bit has to be set high. See
the GDECEL[15:0] Gemstar Decoding Even Lines, Address
0x48 [7:0]; Address 0x49 [7:0]and the GDECOL[15:0] Gemstar
Decoding Odd Lines, Address 0x4A [7:0]; Address 0x4B [7:0]
sections.
PAL CCAP Data
Half-byte output mode is selected by setting CDECAD = 0, full-
byte output mode is selected by setting CDECAD = 1. See the
GDECAD Gemstar Decode Ancillary Data Format, Address
0x4C [0] section. Table 70 and Table 71 list the bytes of the data
packet.
PAL closed caption data is sliced from Lines 22 and 335. The
corresponding enable bits have to be set.
See the GDECEL[15:0] Gemstar Decoding Even Lines, Address
0x48 [7:0]; Address 0x49 [7:0] and the GDECOL[15:0] Gemstar
Decoding Odd Lines, Address 0x4A [7:0]; Address 0x4B [7:0]
sections.
Table 70. PAL CCAP Data, Half-Byte Mode
Byte D[9]
D[8] D[7] D[6]
0
0
0
0
0
1
1
1
1
1
2
1
1
1
1
3
0
1
0
1
4
!EP
EP
EF
0
5
!EP
EP
0
0
6
!EP
EP
0
0
7
!EP
EP
0
0
8
!EP
EP
0
0
9
!EP
EP
0
0
10
!CS[8] CS[8] CS[7] CS[6]
D[5]
0
1
1
0
1
0
CS[5]
D[4] D[3]
0
0
1
1
1
1
0
0
0
1
0
0
CCAP word1[7:4]
CCAP word1[3:0]
CCAP word2[7:4]
CCAP word2[3:0]
CS[4] CS[3]
D[2]
0
1
1
0
0
1
CS[2]
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data count
User data-words
User data-words
User data-words
User data-words
Checksum
Table 71. PAL CCAP Data, Full-Byte Mode
Byte
D[9] D[8] D[7] D[6] D[5]
0
0
0
0
0
0
1
1
1
1
1
1
2
1
1
1
1
1
3
0
1
0
1
0
4
!EP
EP
EF
0
1
5
!EP
EP
0
0
0
6
CCAP word1[7:0]
7
CCAP word2[7:0]
8
1
0
0
0
0
9
1
0
0
0
0
10
!CS[8] CS[8] CS[7] CS[6] CS[5]
D[4]
0
1
1
0
0
0
0
0
CS[4]
D[3]
0
1
1
0
1
0
0
0
CS[3]
D[2]
0
1
1
0
0
1
0
0
CS[2]
D[1]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[0]
0
1
1
0
0
0
0
0
0
0
CS[0]
Description
Fixed preamble
Fixed preamble
Fixed preamble
DID
SDID
Data Count
User data-words
User data-words
UDW padding 0x200
UDW padding 0x200
Checksum
Rev. 0 | Page 54 of 96