EVAL-ADV7181BEB Analog Devices Inc, EVAL-ADV7181BEB Datasheet - Page 55

• Manufacturer Part Number: EVAL-ADV7181BEB
• Description: BOARD EVALUATION FOR ADV7181
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of EVAL-ADV7181BEB

• Contents: Evaluation Board
• For Use With/related Products: ADV7181
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 72. PAL CCAP Data, Full-Byte Mode
Byte
0
1
2
3
4
5
6
7
8
9
10
GDECEL[15:0] Gemstar Decoding Even Lines,
Address 0x48[7:0]; Address 0x49[7:0]
The 16 bits of the GDECEL[15:0] are interpreted as a collection
of 16 individual line decode enable signals. Each bit refers to a
line of video in an even field. Setting the bit enables the decoder
block trying to find Gemstar or closed caption-compatible data
on that particular line. Setting the bit to 0 prevents the decoder
from trying to retrieve data. See Table 73 and Table 74.
To retrieve closed caption data services on NTSC (Line 284),
GDECEL[11] must be set.
To retrieve closed caption data services on PAL (Line 335),
GDECEL[14] must be set.
The default value of GDECEL[15:0] is 0x0000. This setting
instructs the decoder not to attempt to decode Gemstar or
CCAP data from any line in the even field.
GDECOL[15:0] Gemstar Decoding Odd Lines, Address
0x4A[7:0]; Address 0x4B[7:0]
The 16 bits of the GDECOL[15:0] form a collection of 16
individual line decode enable signals. See Table 73 and Table 74.
To retrieve closed caption data services on NTSC (Line 21),
GDECOL[11] must be set.
To retrieve closed caption data services on PAL (Line 22),
GDECOL[14] must be set.
The default value of GDEC0L[15:0] is 0x0000. This setting
instructs the decoder not to attempt to decode Gemstar or
CCAP data from any line in the odd field.
D[9]
0
1
1
0
!EP
!EP
1
1
!CS[8]
D[8]
0
1
1
1
EP
EP
0
0
CS[8]
D[7]
0
1
1
0
EF
0
0
0
CS[7]
0
1
1
D[6]
1
0
0
CCAP Word1[7:0]
CCAP Word2[7:0]
0
0
CS[6]
D[5]
0
1
1
0
1
0
0
0
CS[5]
Rev. B | Page 55 of 100
D[4]
0
1
1
0
0
0
0
0
CS[4]
D[3]
0
1
1
0
1
0
0
0
CS[3]
GDECAD Gemstar Decode Ancillary Data Format,
Address 0x4C[0]
The decoded data from Gemstar-compatible transmissions
or closed caption transmissions is inserted into the horizontal
blanking period of the respective line of video. A potential
problem can arise if the retrieved data bytes have the value 0x00
or 0xFF. In an ITU-R BT.656-compatible data stream, those
values are reserved and used only to form a fixed preamble.
The GDECAD bit allows the data to be inserted into the
horizontal blanking period in two ways
•
•
When GDECAD is 0, the data is split into half-bytes and
inserted (default).
When GDECAD is 1, the data is output straight in 8-bit format.
Insert all data straight into the data stream, even the reserved
values of 0x00 and 0xFF, if they occur. This can violate the
output data format specification ITU-R BT.1364.
Split all data into nibbles and insert the half-bytes over
double the number of cycles in a 4-bit format.
D[2]
0
1
1
0
0
1
0
0
CS[2]
0
1
1
0
0
0
0
0
0
0
CS[1]
D[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
ADV7181B