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參數資料
| 型號： | 935265762518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | COLOR SIGNAL ENCODER, PQFP44 |
| 封裝： | PLASTIC, SOT-307, QFP-44 |
| 文件頁數： | 42/59頁 |
| 文件大小： | 232K |
| 代理商： | 935265762518 |
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2000 Mar 08
47
Philips Semiconductors
Product specication
Digital video encoder
SAA7128H; SAA7129H
8.2
Teletext timing
Time tFD is the time needed to interpolate input data TTX
and insert it into the CVBS and VBS output signal, such
that it appears at tTTX = 9.78 s (PAL) or tTTX = 10.5 s
(NTSC) after the leading edge of the horizontal
synchronization pulse.
Time tPD is the pipeline delay time introduced by the
source that is gated by TTXRQ in order to deliver TTX
data. This delay is programmable by register TTXHD.
For every active HIGH state at output pin TTXRQ, a new
teletext bit must be provided by the source (new protocol)
or a window of TTXRQ going HIGH is provided and the
number of teletext bits, depending on the chosen teletext
standard, is requested at input pin TTX (old protocol).
Since the beginning of the pulses representing the TTXRQ
signal and the delay between the rising edge of TTXRQ
and valid teletext input data are fully programmable
(TTXHS and TTXHD), the TTX data is always inserted at
the correct position after the leading edge of outgoing
horizontal synchronization pulse.
Time ti(TTXW) is the internally used insertion window for
TTX data; it has a constant length that allows insertion of
360 teletext bits at a text data rate of 6.9375 Mbits/s
(PAL), 296 teletext bits at a text data rate of 5.7272 Mbits/s
(WST) or 288 teletext bits at a text data rate of
5.7272 Mbits/s (NABTS). The insertion window is not
opened if the control bit TTXEN is zero.
Using appropriate programming, all suitable lines of the
odd field (TTXOVS and TTXOVE) plus all suitable lines of
the even field (TTXEVS and TTXEVE) can be used for
teletext insertion.
Fig.23 Teletext timing.
handbook, full pagewidth
ti(TTXW)
tTTX
tPD
tFD
CVBS/Y
TTX
TTXRQ (new)
TTXRQ (old)
text bit #:
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10 11
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MHB504
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