參數(shù)資料
型號(hào)： STV9212
廠商： 意法半導(dǎo)體
英文描述： Video Processor for CRT Monitors with PictureBooST
中文描述： 視頻處理器PictureBooST的CRT顯示器
文件頁(yè)數(shù)： 11/34頁(yè)
文件大?。?/td> 335K
代理商： STV9212
11/34
STV9212
Functional Description
2.5
OSD Insertion
The On-Screen Display (OSD) is inserted with a high level on the FBLK input (TTL). The device
acts as follows:
G
The three RGB video input signals (IN1, IN2, IN3) are internally blanked, i.e. put at the black
level.
G
Binary levels (TTL) on inputs OSD1, OSD2 and OSD3, after processing in the OSD contrast
stage, are added to the corresponding blanked video channels.
In this way, the OSD contents replace the video contents where the FBLK input is high. See
Figure 2
and
Figure 10
.
The OSD is inserted after the PictureBooST
block and before the Drive block. As a consequence,
OSD insertion overlaps all video contents, including the PictureBooST
-ed zones. Color
temperature adjustments by means of the I2C-bus Drive registers act in the OSD insets.
The OSD contrast stage allows the adjustment of the level of OSD insets simultaneously on the
three OSD channels and independently of the video contrast adjustment. Refer to
Section 4: Electrical Specifications
for values.
2.6
Drive Stage
The Drive stage is a set of three attenuators separately controlled via three I2C-bus registers,
DRIVE1, DRIVE2 and DRIVE3. It affects all signals, ordinary video, PictureBooST
processed
video and OSD insets. It is designed to compensate for differences in gain of the three CRT
cathodes. See
Figure 11
and for values, refer to
Section 4: Electrical Specifications
.
Figure 10: OSD Insertion
OSD insertion
FBLK
OSD1(2,3)
O
min.
max
S
Video Black Level
mid
V
OSD
Video before
OSDCRST
OSD insertion
Video after
V
Ref
Video Black Level
V
Ref
Note: The OSDCRST I2C-bus field acts equally on all 3 OSD channels.
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