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參數資料
| 型號： | 935261350112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | COLOR SIGNAL DECODER, PDIP32 |
| 封裝： | 0.400 INCH, PLASTIC, SOT-232, SDIP-32 |
| 文件頁數： | 2/43頁 |
| 文件大小： | 356K |
| 代理商： | 935261350112 |
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1996 Jan 17
10
Philips Semiconductors
Preliminary specication
I2C-bus controlled, alignment-free
PAL/NTSC/SECAM decoder/sync processor
TDA9143
The divider system operates at twice the horizontal
frequency. The line counter receives enable pulses at this
frequency, thereby counting two pulses per line. A state
diagram of the controller is shown in Fig.5. Because it is
symmetrical only the right-hand part will be described.
Depending on the previously found vertical frequency, the
controller will be in one of the COUNT states. When the
line counter has counted 488 pulses (i.e. 244 lines of the
video input signal), the controller will move to the next state
depending on the output of the norm counter. This can be
either NORM, NEAR_NORM or NO_NORM, depending
on the position of the vertical sync pulse in the previous
fields. When the controller is in the NORM state it
generates the vertical sync pulse (VSP) automatically and
then, when the line counter is at LC = 626, moves to the
WAIT state. In this condition it waits for the next pulse of
the double line frequency signal, and then moves to the
COUNT state of the current field frequency. When the
controller returns to the COUNT state, the line counter will
be reset half a line after the start of the vertical sync pulse
of the video input signal. The NORM window normally
looks within one line width and a sudden half line delay of
the vertical sync pulse change can therefore be neglected.
Fig.5 State diagram of the vertical divider system.
handbook, full pagewidth
MGE042
WAIT
FOR
RESET
PULSE
NO
NORM
COUNT
LC = 528 or LC = 576 or on VSP LC = 628 or LC = 722 or on VSP
no_norm
else
no_norm
norm
LC
< 488
LC
≤ 525
LC
≤ 625
NEAR
NORM
NEAR
NORM
LC
< 522
LC
< 622
LC
< 488
on SYNC
if LC
< 576
on SYNC
if LC
≥ 576
LC = 526
LC = 626
on VSP if
522
< LC < 528
or on LC = 528
on VSP if
622
< LC < 628
or on LC = 628
vertical frequency 60 Hz
vertical frequency 50 Hz
near_norm
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