HMP8117CN Intersil Corporation, HMP8117CN Datasheet - Page 18

• Manufacturer Part Number: HMP8117CN
• Description: NTSC/PAL Video Decoder
• Manufacturer: Intersil Corporation

NOTES:
NOTES:
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
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.
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.
Data Block Number
Data Block Number
Data Word Count
Data Word Count
PIXEL OUTPUT
PIXEL OUTPUT
Caption Data
WSS Data
WSS CRC
Preamble
Preamble
Data ID
Data ID
Data
CRC
CRC
TABLE 6. READING THE CLOSED CAPTION DATA AS BT.656 ANCILLARY DATA
TABLE 7. OUTPUTTING THE SLICED WSS DATA AS BT.656 ANCILLARY DATA
18
P15
P14
P14
P14
P14
P14
P14
P14
P14
P14
P14
P14
P14
P15
P14
P14
P14
P14
P14
P14
P14
P14
0
1
1
0
1
1
bit 6
P14
P14
bit 6
ep
ep
ep
ep
ep
ep
ep
ep
ep
ep
ep
0
1
1
ep
ep
ep
ep
ep
ep
ep
0
1
1
P13
bit 5
P13
bit 5
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
HMP8117
bit 4
P12
P12
bit 4
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
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.
bit 11
bit 7
bit 3
bit 3
bit 3
P11
bit 15
bit 11
bit 7
bit 3
bit 3
P11
0
1
1
0
0
0
0
0
0
0
0
1
1
0
0
0
bit 10
bit 6
bit 2
bit 2
bit 2
P10
bit 14
bit 10
bit 6
bit 2
bit 2
0
1
1
0
0
0
0
0
0
0
P10
0
1
1
0
0
0
bit 13
bit 9
bit 5
bit 1
bit 5
bit 1
bit 1
P9
bit 13
0
1
1
1
0
1
0
0
bit 9
bit 5
bit 1
bit 1
P9
0
1
1
0
0
0
1 = even field data
0 = odd field data
1 = even field data
0 = odd field data
bit 12
bit 8
bit 4
bit 0
bit 4
bit 0
bit 0
bit 12
P8
bit 8
bit 4
bit 0
bit 0
0
1
1
1
0
0
0
P8
0
1
1
1
1