HMP8115 Intersil Corporation, HMP8115 Datasheet - Page 19

• Manufacturer Part Number: HMP8115
• Description: Ntsc/pal Video Decoder
• Manufacturer: Intersil Corporation

NOTES:
36. ep = even parity for P8-P13.
37. CRC = Sum of P8-P14 of Data ID through last user data word. Preset to all zeros, carry is ignored.
38. For 525-line system B, bits 280-343 are “0”.
39. For system C, bits 272-343 are “0”.
NOTES:
33. The MSB is bit number: 271 for system C, 279 for system B 525-line and 343 for system B 625-line.
34. The clock run-in is 16 bits wide for both systems and is not included in the BT.656 ancillary data stream.
35. The bit rate is 5.727272 Mbits/second for system B and C on 525/60 systems and 6.9375 and 5.734375 Mbits/second respectively for
(B, 625-line = 43 bytes)
(B, 525-line = 35 bytes)
625/50 systems.
Data Block Number
Data Word Count
(C = 34 bytes)
PIXEL INPUT
Teletext Data
Preamble
Reserved
Data ID
CRC
TABLE 7. OUTPUTTING THE SLICED TELETEXT DATA AS BT.656 ANCILLARY DATA
CLOCK
RUN-IN
P15
P14
P14
P14
P14
P14
P14
P14
P14
P14
P14
0
1
1
FIGURE 18. TELETEXT VBI VIDEO SIGNAL
bit 6
P14
ep
ep
ep
ep
ep
ep
ep
ep
ep
0
1
1
Bit 0
0 = 525-line
1 = 625-line
HMP8115
bit 5
P13
0
1
1
1
0
0
0
0
0
0
0
19
DATA PACKET
0 = system B
1 = system C
bit 4
P12
0
1
1
1
0
1
0
0
0
0
0
:
bit 343
bit 339
bit 7
bit 3
bit 3
P11
0
1
1
0
0
0
0
0
bit 342
bit 338
bit 6
bit 2
bit 2
P10
MSB
0
1
1
1
0
1
0
0
bit 341
bit 337
bit 5
bit 1
bit 1
P9
0
1
1
0
0
1
0
0
bit 340
bit 336
bit 4
bit 0
bit 0
P8
0
1
1
0
1
0
0
0