HMP8115CN 查看數據表（PDF） - Intersil

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HMP8115CN

NTSC/PAL Video Decoder

Intersil 

HMP8115

CLOCK

RUN-IN

Bit 0

DATA PACKET

MSB

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

625/50 systems.

FIGURE 18. TELETEXT VBI VIDEO SIGNAL

TABLE 7. OUTPUTTING THE SLICED TELETEXT DATA AS BT.656 ANCILLARY DATA

PIXEL INPUT

P15

P14

P13

P12

P11

P10

Preamble

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

1

1

1

Data ID

P14

ep

1

1

0

1

Data Block Number

P14

ep

0

0

0

0

Data Word Count

P14

ep

0

1

0

1

Teletext Data

P14

(B, 625-line = 43 bytes)

(B, 525-line = 35 bytes)

(C = 34 bytes)

P14

ep

0 = 525-line

0 = system B bit 343 bit 342

1 = 625-line

1 = system C

ep

0

0

bit 339 bit 338

:

P14

ep

0

0

bit 7

bit 6

P14

ep

0

0

bit 3

bit 2

Reserved

P14

ep

0

0

0

0

P14

ep

0

0

0

0

CRC

P14

bit 6

bit 5

bit 4

bit 3

bit 2

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”.

P9

0

1

1

0

0

1

bit 341

bit 337

bit 5

bit 1

0

0

bit 1

P8

0

1

1

0

1

0

bit 340

bit 336

bit 4

bit 0

0

0

bit 0

19

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