HMP8117 Datasheet, PDF (18/45 Pages) Intersil Corporation – NTSC/PAL Video Decoder

HMP8117
TABLE 6. READING THE CLOSED CAPTION DATA AS BT.656 ANCILLARY DATA
PIXEL OUTPUT
P15
P14
P13
P12
P11
P10
P9
P8
Preamble
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Data ID
P14
ep
1
1
0
0
0
0 = odd field data
1 = even field data
Data Block Number
P14
ep
0
0
0
0
0
1
Data Word Count
P14
ep
0
0
0
0
0
1
Caption Data
P14
ep
0
0
bit 15
bit 14
bit 13
bit 12
P14
ep
0
0
bit 11
bit 10
bit 9
bit 8
P14
ep
0
0
bit 7
bit 6
bit 5
bit 4
P14
ep
0
0
bit 3
bit 2
bit 1
bit 0
CRC
P14
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
NOTES:
25. ep = even parity for P8-P13.
26. CRC = Sum of P8-P14 of Data ID through last user data word. Preset to all zeros, carry is ignored.
TABLE 7. OUTPUTTING THE SLICED WSS DATA AS BT.656 ANCILLARY DATA
PIXEL OUTPUT
P15
P14
P13
P12
P11
P10
P9
P8
Preamble
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Data ID
P14
ep
1
1
0
0
1
0 = odd field data
1 = even field data
Data Block Number
P14
ep
0
0
0
0
0
1
Data Word Count
P14
ep
0
0
0
0
1
0
WSS Data
P14
ep
0
0
0
0
bit 13
bit 12
P14
ep
0
0
bit 11
bit 10
bit 9
bit 8
P14
ep
0
0
bit 7
bit 6
bit 5
bit 4
P14
ep
0
0
bit 3
bit 2
bit 1
bit 0
WSS CRC
P14
ep
0
0
0
0
bit 5
bit 4
Data
P14
ep
0
0
bit 3
bit 2
bit 1
bit 0
P14
ep
0
0
0
0
0
0
P14
ep
0
0
0
0
0
0
CRC
P14
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
NOTES:
27. ep = even parity for P8-P13.
28. WSS CRC data = “00 0000” during PAL operation.
29. CRC = Sum of P8-P14 of Data ID through last user data word. Preset to all zeros, carry is ignored.
Teletext
The HMP8117 supports ITU-R BT.653 625-line and 525-line
teletext system B, C and D capture. NABTS (North American
Broadcast Teletext Specification) is the same as BT.653 525-
line system C, which is also used to transmit Intel Intercast™
information. WST (World System Teletext) is the same as
BT.653 system B. Figure 16 shows the basic structure of a
video signal that contains teletext data.
The scan lines containing teletext information are monitored.
If teletext is enabled and teletext data is present, the teletext
data is output as BT.656 ancillary data.
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