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| 型號(hào)： | 935262451518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號(hào)轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP100 |
| 封裝： | 14 X 14 X 1.40 MM, PLASTIC, SOT-407, LQFP-100 |
| 文件頁(yè)數(shù)： | 93/144頁(yè) |
| 文件大小： | 592K |
| 代理商： | 935262451518 |
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2000 Mar 15
52
Philips Semiconductors
Preliminary specication
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb lter, VBI-data slicer and high performance scaler
SAA7114H
8.4
VBI-data decoder and capture
(subaddresses 40H to 7FH)
The SAA7114H contains a versatile VBI-data decoder.
The implementation and programming model accords to
the VBI-data slicer built in the multimedia video data
acquisition circuit SAA5284.
The circuitry recovers the actual clock phase during the
clock run-in period, slices the data bits with the selected
data rate, and groups them to bytes. The result is buffered
into a dedicated VBI-data FIFO with a capacity of
2
× 56 bytes (2 × 14 Dwords). The clock frequency,
signals source, field frequency, accepted error count must
be defined in subaddress 40H.
The supported VBI-data standards are shown in Table 14.
For lines 2 to 24 of a field, per VBI line, 1 of 16 standards
can be selected (LCR24_[7:0] to LCR2_[7:0] in
57H[7:0] to 41H[7:0]: 23
× 2 × 4 bit programming bits).
The definition for line 24 is valid for the rest of the
corresponding field, normally no text data (= video data)
should be selected there (LCR24_[7:0] = FFH) to stop the
activity of the VBI-data slicer during active video.
To adjust the slicers processing to the input signal source,
there are offsets in horizontal and vertical direction
available: parameters HOFF[10:0]5BH[2:0]59H[7:0],
VOFF[8:0]5BH[4]5AH[7:0] and FOFF[5BH[7]]).
Contrary to the scalers counting, the slicers offsets are
defining the position of the H and V trigger events related
to the processed video field. The trigger events are the
falling edge of HREF and the falling edge of V123 from the
decoder processing part.
The relation of these programming values to the input
signal and the recommended values can be seen in
Tables 4 to 7.
Table 14 Data types supported by the data slicer block
DT[3:0]
62H[3:0]
STANDARD TYPE
DATA RATE
(Mbits/s)
FRAMING CODE
FC
WINDOW
HAM
CHECK
0000
teletext EuroWST, CCST
6.9375
27H
WST625
always
0001
European closed caption
0.500
001
CC625
0010
VPS
5
9951H
VPS
0011
wide screen signalling bits
5
1E3C1FH
WSS
0100
US teletext (WST)
5.7272
27H
WST525
always
0101
US closed caption (line 21)
0.503
001
CC525
0110
(video data selected)
5
none
disable
0111
(raw data selected)
5
none
disable
1000
teletext
6.9375
programmable
general text
optional
1001
VITC/EBU time codes (Europe)
1.8125
programmable
VITC625
1010
VITC/SMPTE time codes (USA)
1.7898
programmable
VITC625
1011
reserved
1100
US NABTS
5.7272
programmable
NABTS
optional
1101
MOJI (Japanese)
5.7272
programmable (A7H) Japtext
1110
Japanese format switch (L20/22)
5
programmable
open
1111
no sliced data transmitted
(video data selected)
5
none
disable
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