Datasheet

TVP5147M1

SLES140G –JULY 2005–REVISED FEBRUARY 2012

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2.7.1 VBI FIFO and Ancillary Data in Video Stream

Sliced VBI data can be output as ancillary data in the video stream in ITU-R BT.656 mode. VBI data is

output on the Y[9:2] terminals during the horizontal blanking period. Table 2-7 shows the header format

and sequence of the ancillary data inserted into the video stream. This format is also used to store any

VBI data into the FIFO. The size of the FIFO is 512 bytes. Therefore, the FIFO can store up to 11 lines of

teletext data with the NTSC NABTS standard.

Table 2-7. Ancillary Data Format and Sequence

BYTE D7

D6 D5 D4 D3 D2 D1 D0 (LSB) DESCRIPTION

NO. (MSB)

0 0 0 0 0 0 0 0 0

1 1 1 1 1 1 1 1 1 Ancillary data preamble

2 1 1 1 1 1 1 1 1

3 NEP EP 0 1 0 DID2 DID1 DID0 Data ID (DID)

4 NEP EP F5 F4 F3 F2 F1 F0 Secondary data ID (SDID)

5 NEP EP N5 N4 N3 N2 N1 N0 Number of 32 bit data (NN)

6 Video line # [7:0] Internal data ID0 (IDID0)

7 0 0 0 Data error Match #1 Match #2 Video line # [9:8] Internal data ID1 (IDID1)

8 1. Data Data byte 1st word

9 2. Data Data byte

10 3. Data Data byte

11 4. Data Data byte

⋮ ⋮ ⋮

m. Data Data byte Nth word

CS[7:0] Check sum

4N+7 0 0 0 0 0 0 0 0 Fill byte

EP: Even parity for D0–D5

NEP: Negated even parity

DID: 91h: Sliced data of VBI lines of first field

53h: Sliced data of line 24 to end of first field

55h: Sliced data of VBI lines of second field

97h: Sliced data of line 24 to end of second field

SDID: This field holds the data format taken from the line mode register bits [2:0] of the corresponding line.

NN: Number of Dwords beginning with byte 8 through 4N+7. This value is the number of Dwords where each Dword is 4 bytes.

IDID0: Transaction video line number [7:0]

IDID1: Bit 0/1 = Transaction video line number [9:8]

Bit 2 = Match 2 flag

Bit 3 = Match 1 flag

Bit 4 = 1 if an error was detected in the EDC block.0 if no error was detected.

CS: Sum of D0–D7 of DID through last data byte

Fill byte: Fill bytes make a multiple of four bytes from byte 0 to last fill byte. For teletext modes, byte 8 is the sync pattern byte. Byte 9 is

the first data byte.

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