參數(shù)資料
型號: TVP5146M2IPFPR
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號轉(zhuǎn)換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: GREEN, PLASTIC, HTQFP-80
文件頁數(shù): 37/107頁
文件大?。?/td> 949K
代理商: TVP5146M2IPFPR
SLES141G
– JULY 2005 – REVISED APRIL 2011
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
D7
D0
BYTE NO.
D6
D5
D4
D3
D2
D1
DESCRIPTION
(MSB)
(LSB)
0
1
Ancillary data preamble
2
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
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
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.
Copyright
2005–2011, Texas Instruments Incorporated
Functional Description
35
Product Folder Link(s): TVP5146M2
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