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參數資料
型號: TVP5146PFPG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號轉換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: GREEN, PLASTIC, HTQFP-80
文件頁數: 41/109頁
文件大小: 1658K
代理商: TVP5146PFPG4
29
SLES084C August 2007
TVP5146
2.7.2 VBI Raw Data Output
The TVP5146 decoder can output raw A/D video data at twice the sampling rate for external VBI
slicing. This is transmitted as an ancillary data block, although somewhat differently from the
way the sliced VBI data is transmitted in the FIFO format as described in Section 2.7.1. The
samples are transmitted during the active portion of the line. VBI raw data uses ITU-R BT.656
format having only luma data. The chroma samples are replaced by luma samples. The
TVP5146 decoder inserts a four-byte preamble 000h 3FFh 3FFh 180h before data start. There
are no checksum bytes and fill bytes in this mode.
Table 28. VBI Raw Data Output Format
BYTE
NO.
D9
(MSB)
D8
D7
D6
D5
D4
D3
D2
D1
D0
(LSB)
DESCRIPTION
0
1
VBI raw data preamble
2
1
VBI raw data preamble
3
0
1
0
4
1. Data
5
2. Data
2
il
t l
d t
:
2
× pixel rate luma data
(i e NTSC 601: n = 1707)
n–1
n–5. Data
(i.e., NTSC 601: n = 1707)
n
n–4. Data
2.8
Reset and Initialization
Reset is initiated at power up or any time terminal 34 (RESETB) is brought low. Table 29
describes the status of the TVP5146 terminals during and immediately after reset.
Table 29. Reset Sequence
SIGNAL NAME
DURING RESET
RESET COMPLETED
Y[9:0], C[9:0], DATACLK
Input
High-impedance
RESETB, PWDN, SDA, SCL, FSS,
AVID, GLCO, HS, VS, FID
Input
INTREQ
Input
Output
DATACLK
Output
High-impedance
TI recommends the following power-up sequence.
3 ms (min)
RESETB
(Terminal 34)
1 ms (min)
Invalid I2C Cycle
Valid
Normal Operation
100
ms
SDA
(Terminal 29)
Power (1.8 V)
Power (3.3 V)
Reset
NOTE: All times shown are minimum values. Maximum time between 1.8 V and 3.3 V should be no longer than 1 second.
Figure 226. Reset Timing
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