Table 72: Ancillary Data In Nibble Output Format; Table 73: Ancillary Data In Byte Output Format - Analog Devices Advantiv ADV7604 Hardware Manual

calculated value, and B9 as the inverse of B8. The checksum value B8 to B0 is equal to the
nine least significant bits of the total sum of the nine least significant bits of the DID, SDID,
DC words, and all UDWs in the packet. Prior to the start of the checksum count cycle, all
checksum and carry bits are preset to zero. Any carry out resulting from the checksum count
cycle is ignored.
• EP
The MSB B9 is the inverse EP and this ensures that restricted codes 0x00 and 0xFF will not
occur.
• LCOUNT [11:0]
This number represents the line number from which the VBI data was decoded. The line
number is as per the numbering system in ITU-R BT.470. The line number runs from 1 to
625 in a 625 line system. For 625i, the line number coming out with the ancillary stream is
plus one of the line number in
• Data Count
The data count specifies the number of user data words in the ancillary stream for the
standard. The total number of user data words = 4 * Data Count. Padding words can be
introduced to make the total number of user data words divisible by four.
Byte B9 B8
0 0 0
1 1 1
2 1 1
EP
3 EP
EP
4 EP
5 EP EP
6 EP EP
EP
7 EP
EP
8 EP
EP
9 EP
EP
10 EP
EP
11 EP
EP
12 EP
EP
13 EP
EP
14 EP
- - -
- - -
- - -
n-3 1 0
n-2 1 0
B8
n-1 Checksum
Rev. F August 2010
Table 68. This applies for both even and odd fields of 625i.

Table 72: Ancillary Data in Nibble Output Format

B7 B6 B5 B4
0 0 0 0
1 1 1 1
1 1 1 1
I2C_DID6_2[4:0]
I2C_SDID7_2[5:0]
0 DC[4:0]
PADDIN
VBI_DATA_STD[3:0]
G[1:0]
LCOUNT[11:6]
LCOUNT[5:0]
0 0 0 EF
0 0 VBI_WORD_1[7:4]
0 0 VBI_WORD _1[3:0]
0 0 VBI_WORD _2[7:4]
0 0 VBI_WORD _2[3:0]
0 0 VBI_WORD _3[7:4]
- - - -
- - - -
- - - -
0 0 0 0
0 0 0 0

Table 73: Ancillary Data in Byte Output Format

B3 B2 B1
0 0 0
1 1 1
1 1 1
0
0
0
0
0
0
VDP_TTXT_
0
TYPE[1:0]
0
0
0
0
0
- -
- -
- -
0 0 0
0 0 0
0
334
B0 Description
0
Ancillary data preamble
1
1
DID – data identification
0
word
SDID – secondary data
0
identification word
0 Data count
0 ID0 – user data word 1
0 ID1 – user data word 2
0 ID2 – user data word 3
0 ID3 – user data word 4
0 User data word 5
0 User data word 6
0 User data word 7
0 User data word 8
0 User data word 9
- -
- -
- -
0 (Pad 0x200. These padding
words may or may not be
present depending on
0
ancillary data type.) User
data word.
0
ADV7604
-
-
-