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參數資料
| 型號： | VPX322XE |
| 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?。?/td> | 567K |
| 代理商： | VPX322XE |
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ADVANCE INFORMATION
VPX 322xE
34
Micronas
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
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