參數(shù)資料
型號： 935262451518
廠商： NXP SEMICONDUCTORS
元件分類： 顏色信號轉(zhuǎn)換
英文描述： COLOR SIGNAL DECODER, PQFP100
封裝： 14 X 14 X 1.40 MM, PLASTIC, SOT-407, LQFP-100
文件頁數(shù)： 96/144頁
文件大?。?/td> 592K
代理商： 935262451518
2000 Mar 15
55
Philips Semiconductors
Preliminary specication
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb lter, VBI-data slicer and high performance scaler
SAA7114H
8.5.5
DATA STREAM CODING AND REFERENCE SIGNAL
GENERATION
(SUBADDRESSES 84H, 85H AND 93H)
As H and V reference signals are logic 1, active gate
signals are generated, which are framing the transfer of
the valid output data. Alternative to the gates, H and V
trigger pulses are generated on the rising edges of the
gates.
Due to the dynamic FIFO behaviour of the complete scaler
path, the output signal timing has no fixed timing relation
to the real-time input video stream. So fixed propagation
delays, in therms of clock cycles, related to the analog
input can not be defined.
The data stream is accompanied by a data qualifier.
Additionally invalid data cycles are marked with code 00H.
If ITU 656 like codes are not wanted, these codes can be
suppressed in the output stream.
As further option, it is possible to provide the scaler with a
gating external signal on pin ITRDY. So it is possible to
hold the data output for a certain time and to get valid
output data in bursts of a guaranteed length.
The sketched reference signals and events can be
mapped to the I-port output pins IDQ, IGPH, IGPV,
IGP0 and IGP1. For flexible use the polarities of all the
outputs can be modified. The default polarity for the
qualifier and reference signals is logic 1 (= active).
Table 18 shows the relevant and supported SAV and EAV
coding.
Table 18 SAV/EAV codes on I-port
Notes
1. The leading byte sequence is: FFH-00H-00H.
2. The MSB of the SAV/EAV code byte is controlled by:
a) Scaler output data: task A
MSB = CONLH (90H[7]); task B MSB = CONLH (C0H[7]).
b) VBI-data slicer output data: DID[5:0]5DH[5:0] = 3EH
MSB = 1; DID[5:0]5DH[5:0] = 3FH MSB = 0.
EVENT DESCRIPTION
SAV/EAV CODES ON I-PORT(1) (HEX)
COMMENT
MSB(2) OF SAV/EAV BYTE = 0 MSB(2) OF SAV/EAV BYTE = 1
FIELD ID = 0
FIELD ID = 1
FIELD ID = 0
FIELD ID = 1
Next pixel is FIRST pixel of any
active line
0E
49
80
C7
HREF = active;
VREF = active
Previous pixel was LAST pixel
of any active line, but not the
last
13
54
9D
DA
HREF = inactive;
VREF = active
Next pixel is FIRST pixel of any
V-blanking line
25
62
AB
EC
HREF = active;
VREF = inactive
Previous pixel was LAST pixel
of the last active line or of any
V-blanking line
38
7F
B6
F1
HREF = inactive;
VREF = inactive
No valid data, don’t capture
and don’t increment pointer
00
IDQ pin inactive
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