
ADV7188
Rev. A | Page 75 of 112
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 CC
data from any line in the even field. The user should only enable
Gemstar slicing on lines where VBI data is expected.
Table 94. NTSC Line Enable Bits and
Corresponding Line Numbering
line [3:0]
Line Number
(ITU-R BT.470)
Enable Bit
Comment
0
10
GDECOL [0]
Gemstar
1
11
GDECOL [1]
Gemstar
2
12
GDECOL [2]
Gemstar
3
13
GDECOL [3]
Gemstar
4
14
GDECOL [4]
Gemstar
5
15
GDECOL [5]
Gemstar
6
16
GDECOL [6]
Gemstar
7
17
GDECOL [7]
Gemstar
8
18
GDECOL [8]
Gemstar
9
19
GDECOL [9]
Gemstar
10
20
GDECOL [10]
Gemstar
11
21
GDECOL [11]
Gemstar or CC
12
22
GDECOL [12]
Gemstar
13
23
GDECOL [13]
Gemstar
14
24
GDECOL [14]
Gemstar
15
25
GDECOL [15]
Gemstar
0
273 (10)
GDECEL [0]
Gemstar
1
274 (11)
GDECEL [1]
Gemstar
2
275 (12)
GDECEL [2]
Gemstar
3
276 (13)
GDECEL [3]
Gemstar
4
277 (14)
GDECEL [4]
Gemstar
5
278 (15)
GDECEL [5]
Gemstar
6
279 (16)
GDECEL [6]
Gemstar
7
280 (17)
GDECEL [7]
Gemstar
8
281 (18)
GDECEL [8]
Gemstar
9
282 (19)
GDECEL [9]
Gemstar
10
283 (20)
GDECEL [10]
Gemstar
11
284 (21)
GDECEL [11]
Gemstar or CC
12
285 (22)
GDECEL [12]
Gemstar
13
286 (23)
GDECEL [13]
Gemstar
14
287 (24)
GDECEL [14]
Gemstar
15
288 (25)
GDECEL [15]
Gemstar
Table 95. PAL Line Enable Bits and
Corresponding Line Numbering1 Line [3:0]
Line Number
(ITU-R BT.470)
Enable Bit
Comment
12
8
GDECOL [0]
Not valid
13
9
GDECOL [1]
Not valid
14
10
GDECOL [2]
Not valid
15
11
GDECOL [3]
Not valid
0
12
GDECOL [4]
Not valid
1
13
GDECOL [5]
Not valid
2
14
GDECOL [6]
Not valid
3
15
GDECOL [7]
Not valid
4
16
GDECOL [8]
Not valid
5
17
GDECOL [9]
Not valid
6
18
GDECOL [10]
Not valid
7
19
GDECOL [11]
Not valid
8
20
GDECOL [12]
Not valid
9
21
GDECOL [13]
Not valid
10
22
GDECOL [14]
CC
11
23
GDECOL [15]
Not valid
12
321 (8)
GDECEL [0]
Not valid
13
322 (9)
GDECEL [1]
Not valid
14
323 (10)
GDECEL [2]
Not valid
15
324 (11)
GDECEL [3]
Not valid
0
325 (12)
GDECEL [4]
Not valid
1
326 (13)
GDECEL [5]
Not valid
2
327 (14)
GDECEL [6]
Not valid
3
328 (15)
GDECEL [7]
Not valid
4
329 (16)
GDECEL [8]
Not valid
5
330 (17)
GDECEL [9]
Not valid
6
331 (18)
GDECEL [10]
Not valid
7
332 (19)
GDECEL [11]
Not valid
8
333 (20)
GDECEL [12]
Not valid
9
334 (21)
GDECEL [13]
Not valid
10
335 (22)
GDECEL [14]
CC
11
336 (23)
GDECEL [15]
Not valid
1 As indicated by the bold rows, two standards can use the same line for VBI
data.