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參數(shù)資料
| 型號(hào)： | VPX3224D |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Video Pixel Decoders |
| 中文描述： | 視頻解碼器像素 |
| 文件頁數(shù)： | 26/92頁 |
| 文件大?。?/td> | 672K |
| 代理商： | VPX3224D |
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PRELIMINARY DATA SHEET
VPX 3225D, VPX 3224D
26
Micronas
2.9. Operational Modes
The relationship between the video timing signals
(HREF and VREF) and the analog input video is deter-
mined by the selected operational mode. Three such
modes are available: the
Open Mode
, the
Forced
Mode
, and the
Scan Mode
. These modes are selected
via I
2
C commands [FP-RAM 0x140, settm, lattm].
2.9.1. Open Mode
In the Open Mode, both the HREF and the VREF signal
track the analog video input. In the case of a change in
the line standard (i.e. switching between the video input
ports), HREF and VREF automatically synchronize to
the new input. When no video is present, both HREF and
VREF float to the idling frequency of their respective
PLLs. During changes in the video input (drop-out,
switching between inputs), the performance of the
HREF and VREF signals is not guaranteed.
2.9.2. Scan Mode
In the Scan Mode, the HREF and VREF signals are al-
ways generated by free running hardware. They are
therefore completely decoupled from the analog input.
The output video data is always suppressed.
The purpose of the Scan Mode is to allow the external
controller to freely switch between the analog inputs
while searching for the presence of a video signal. In-
formation regarding the video (standard, source, etc...)
can be queried via I
2
C read.
In the Scan Mode, the video line standard of the VREF
and HREF signals can be changed via I
2
C command.
The transition always occurs at the first frame boundary
after the I
2
C command is received. Fig. 2–30, below,
demonstrates the behavior of the VREF signal during
the transition from the 525/60 system to the 625/50 sys-
tem (the width of the vertical reference pulse is exagger-
ated for illustration).
VREF
f
odd
f
odd
f
even
f
even
f
odd
time
16.683 ms
I
2
C Command to
switch video timing standard
Selected timing standard
becomes active
(525/60)
(625/50)
Fig. 2–30:
Transition between timing standards
20.0 ms
33.367 ms
40.0 ms
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VPX3224E | Video Pixel Decoders |
| VPX322XE | Video Pixel Decoders |
| VQ1000J | N-Channel Enhancement-Mode MOSFET Transistor(最小漏源擊穿電壓60V,夾斷電流0.225A的N溝道增強(qiáng)型MOSFET晶體管) |
| VQ1000J | N-Channel 60-V (D-S) MOSFET |
| VQ1001J | Dual N-Channel 30-V (D-S) MOSFET with Schottky Diode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VPX3224D-C3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor |
| VPX3224E | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Pixel Decoders |
| VPX3225D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Pixel Decoders |
| VPX3225D-C3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microprocessor |
| VPX3225E | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Pixel Decoders |
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