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參數資料
| 型號： | VPX3224E |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 英文描述： | Video Pixel Decoders |
| 中文描述： | 視頻解碼器像素 |
| 文件頁數： | 34/92頁 |
| 文件大小： | 616K |
| 代理商： | VPX3224E |
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ADVANCE INFORMATION
VPX 322xE
MICRONAS INTERMETALL
34
2.14. VBI Data Acquisition
The VPX supports two different data acquisition modes
for the vertical blanking interval: a bypass mode for raw
data of the vertical blanking interval and a data slicer
mode in which dedicated hardware provides constant
packets of already decoded VBI-data. The data slicer
mode is not available on VPX 3224E.
For both services, the start and end line of a vertical
blanking interval (VBI) window can be defined for each
field with FP-RAM 0x134–137. Teletext data can occur
between lines 6 and 23 of each field. However, the VBI-
window is freely programmable. It is possible to select
the whole field (beginning with line #3). The VBI-window
can be activated via bit[0] in FP-RAM 0x138.
The identification of valid VBI-lines is possible with the
VACT-signal (or the ‘active line’-flags in the modes with
embedded syncs) or a special ‘data active’ signal on the
TDO pin. Bit[10] of FP-RAM 0x154 selects between
these two cases. In the default mode, VACT is used. The
output of both signals can be suppressed optionally with
bit[2] of FP-RAM 0x138. In this case, the graphic control-
ler has to use only the HREF signal to mask the active
video data.
In the ITU-R656 mode, VBI-data can be transmitted as
vertical ancillary data (with 7 bit resolution + odd parity).
The selections for the VBI-window will be updated by
setting bit[11] in FP-RAM 0x138.
2.14.1. Raw VBI Data
The raw data mode is enabled with bit[1] of FP-RAM
0x138 (vbimode). This mode bypasses the luminance
processing of the video front-end and delivers unmodi-
fied video samples from the ADC to the output ports.
During lines within the VBI-window, specified by the
user settings in the corresponding Load-Table, the VPX
internally acquires 1140 raw data bytes of the luminance
input at a rate of 20.25 MHz corresponding to 56.296
μ
s
of the analog video (see Fig. 2–38). Chrominance data
is not valid. The raw data samples are multiplexed inter-
nally to 570x16 bit on the luminance and chrominance
port. The external timing corresponds to the video mode
with 570 output samples for an uncropped window. Fig-
ure 2–37 shows the timing of both data ports and the
necessary reference signals in this mode.
Fig. 2–38:
Horizontal dimensions of the window
for raw VBI-data
53.33 s
active video
64 s
1140 samples (56.296 s)
Chrominance
(Port B)
VACT or TDO*
LLC
D
1
D
1137
D
1139
Luminance
(Port A)
D
2
D
1138
D
1140
PIXCLK
Fig. 2–37:
Timing during lines with raw VBI-data (single clock mode)
* depending on bit[10] of FP-RAM 0x154
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| VQ1001J | N-Channel Enhancement-Mode MOSFET Transistor(最小漏源擊穿電壓30V，夾斷電流0.83A的N溝道增強型MOSFET) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| VPX3226E | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Pixel Decoders |
| VPX322XE | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video Pixel Decoders |
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