Functional Description

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

 

DESCRIPTION

NO.

(MSB)

 

 

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

Match

Match

Video line # [9:8]

Internal data ID1 (IDID1)

 

 

 

 

error

 

#1

#2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

NOTE: The number of bytes (m) varies depending on the VBI data service.

 

 

 

 

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. Note 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 first data through last data byte.

Fill byte:

Fill bytes make a multiple of 4 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.

 

 

 

SLES140A—March 2007

TVP5147M1PFP

25

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Texas Instruments TVP5147M1PFP VBI Fifo and Ancillary Data in Video Stream, 7. Ancillary Data Format and Sequence, Lsb
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TVP5147M1PFP specifications

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